Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Nissan Almera 2000-2003.2006 Approved Nissan Almera 2006 Classic B10 EC_QG16
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ENGINE CONTROL SYSTEM
SECTION EC
CONTENTS
PRECAUTIONS AND PREPARATION ECM Harness Connector Terminal Layout ........... 53
Precautions .................................................................. 5 ECM Terminals and Reference Value .................... 53
Preparation ................................................................... 9 ECM Inspection Table .............................................. 53
CONSULT-II Function ............................................... 60
INDEX FOR DTC
Engine Control Component Parts/Control Systems
DTC No. Index ........................................................... 11 Application .................................................................. 61
ENGINE CONTROL SYSTEM Work Support Mode .................................................. 63
General ....................................................................... 13 Self-diag Results Mode ............................................ 63
ECCS Controls .......................................................... 13 Data Monitor Mode ................................................... 64
System Diagram ........................................................ 14 Active Test Mode ....................................................... 67
Vacuum Hose Drawing ............................................. 15 Real Time Diagnosis In Data Monitor Mode (Re-
System Chart ............................................................. 16 cording Vehicle Data) ............................................... 68
Multiport Fuel Injection (MFI) System ................... 16 Major Sensor Reference Graph in Data Monitor
Mixture Ratio Feedback Control (Closed Loop Mode ............................................................................ 72
Control) ....................................................................... 17 CLSD THL POS, ACCEL SEN 1, THRTL SEN 1 ... 72
Electronic Ignition (EI) System .............................. 18 ENG SPEED, MAS A/F SE-B1, THRTL SEN 1,
Air Conditioning Cut Control ................................... 19 HO2S1 (B1), INJ PULSE-B1 ................................... 72
Fuel Cut Control (At No Load and High Engine POWER SUPPLY CIRCUIT FOR ECM
Speed) ......................................................................... 20 Wiring Diagram ......................................................... 75
CAN Communication ................................................ 20 Diagnostic Procedure ............................................... 76
A/T Models ................................................................. 21 Component Inspection ............................................. 80
BASIC SERVICE PROCEDURE DTC U1000, U1001 CAN COMMUNICATION LINE
Idle Speed and Ignition Timing Check .................. 22 Description ................................................................. 81
Accelerator Pedal Released Position Learning ... 23 On Board Diagnosis Logic ...................................... 81
Throttle Valve Closed Position Learning .............. 23 DTC Confirmation Procedure .................................. 81
Idle Air Volume Learning ......................................... 24 Wiring Diagram ......................................................... 82
Operation Procedure ................................................ 24 Diagnostic Procedure ............................................... 83
Fuel Pressure Check ................................................ 26
DTC P1065 ECM POWER SUPPLY
Fuel Pressure Check ................................................ 27
Injector ........................................................................ 28 Component Description ........................................... 85
DTC Confirmation Procedure .................................. 85
TROUBLE DIAGNOSIS
Wiring Diagram ......................................................... 86
Trouble Diagnosis Introduction .............................. 31 Diagnostic Procedure ............................................... 87
Work Flow ................................................................... 32
DTC P0340 CAMSHAFT POSITION SENSOR
Description for Work Flow ....................................... 33
(PHASE) CIRCUIT
Diagnostic Worksheet .............................................. 34
Worksheet Sample .................................................... 35 Component Description ........................................... 89
DTC Inspection Priority Chart ................................ 35 On Board Diagnosis Logic ...................................... 89
Fail-safe Chart ........................................................... 36 DTC Confirmation Procedure .................................. 89
Basic Inspection ........................................................ 38 Wiring Diagram ......................................................... 91
Symptom Matrix Chart ............................................. 44 Diagnostic Procedure ............................................... 92
Engine Control Component Parts Location .......... 48 Component Inspection ............................................. 95
Circuit Diagram ......................................................... 52 Removal and Installation ......................................... 95
CONTENTS
DTC P0335 CRANKSHAFT POSITION SENSOR Wiring Diagram ....................................................... 142
(POS) CIRCUIT Diagnostic Procedure ............................................. 143
Component Description ........................................... 96 Component Inspection ........................................... 144
On Board Diagnosis Logic ...................................... 96 Removal and Installation ....................................... 144
DTC Confirmation Procedure .................................. 96 DTC P0122, P0123 THROTTLE POSITION SENSOR-
Wiring Diagram ......................................................... 98 2 CIRCUIT
Diagnostic Procedure ............................................... 99 Component Description ......................................... 145
Component Inspection ........................................... 101 On Board Diagnosis Logic .................................... 145
Removal and Installation ....................................... 102 Fail-Safe Mode ........................................................ 145
DTC P0102, P0103 MASS AIR FLOW SENSOR DTC Confirmation Procedure ................................ 145
CIRCUIT Wiring Diagram ....................................................... 147
Component Description ......................................... 103 Diagnostic Procedure ............................................. 148
On Board Diagnosis Logic .................................... 103 Component Inspection ........................................... 150
Fail-Safe Mode ........................................................ 103 Remove and Installation ........................................ 150
DTC Confirmation Procedure ................................ 103 DTC P1121 ELECTRIC THROTTLE CONTROL
Wiring Diagram ....................................................... 105 ACTUATOR
Diagnostic Procedure ............................................. 106 Component Description ......................................... 151
Component Inspection ........................................... 108 On Board Diagnosis Logic .................................... 151
DTC P0112, P0113 INTAKE AIR TEMPERATURE Fail-Safe Mode ........................................................ 151
SENSOR CIRCUIT DTC Confirmation Procedure ................................ 151
Component Description ......................................... 109 Procedure for Malfunction A and B ...................... 151
Wiring Diagram ....................................................... 110 Procedure for Malfunction C ................................. 152
Diagnostic Procedure ............................................. 111 Diagnostic Procedure ............................................. 152
Component Inspection ........................................... 112 Remove and Installation ........................................ 152
DTC P0117, P0118 ENGINE COOLANT TEMPERA- DTC P1122 ELECTRIC THROTTLE CONTROL
TURE SENSOR CIRCUIT PERFORMANCE PROBLEM
Component Description ......................................... 113 Description ............................................................... 153
On Board Diagnosis Logic .................................... 113 On Board Diagnosis Logic .................................... 153
Fail-Safe Mode ........................................................ 113 Fail-Safe Mode ........................................................ 153
Wiring Diagram ....................................................... 115 DTC Confirmation Procedure ................................ 153
Diagnostic Procedure ............................................. 116 Wiring Diagram ....................................................... 154
Component Inspection ........................................... 117 Diagnostic Procedure ............................................. 155
Removal and Installation ....................................... 117 Component Inspection ........................................... 159
Throttle Control Motor ............................................ 159
DTC P0350 IGNITION SIGNAL PRIMARY
Remove and Installation ........................................ 159
Component Description ......................................... 118
DTC P1124, P1126 THROTTLE CONTROL MOTOR
DTC Confirmation Procedure ................................ 118
RELAY CIRCUIT
Wiring Diagram ....................................................... 119
Diagnostic Procedure ............................................. 121 Component Description ......................................... 160
Component Inspection ........................................... 125 On Board Diagnosis Logic .................................... 160
Condenser ................................................................ 125 Fail-Safe Mode ........................................................ 160
Ignition Coil with Power Transistor ...................... 125 DTC Confirmation Procedure ................................ 160
Removal and Installation ....................................... 126 Procedure For DTC P1124 .................................... 160
Procedure For DTC P1126 .................................... 161
DTC P1217 ENGINE OVER TEMPERATURE (OVER-
Wiring Diagram ....................................................... 162
HEAT)
Diagnostic Procedure ............................................. 163
System Description ................................................. 127 Component Inspection ........................................... 165
Operation .................................................................. 127
DTC P1128 THROTTLE CONTROL MOTOR CIRCUIT
On Board Diagnosis Logic .................................... 128
SHORT
Overall Function Check .......................................... 128
Wiring Diagram ....................................................... 131 Component Description ......................................... 166
Diagnostic Procedure ............................................. 132 On Board Diagnosis Logic .................................... 166
Main 12 Causes of Overheating ........................... 139 Fail-Safe Mode ........................................................ 166
Component Inspection ........................................... 140 DTC Confirmation Procedure ................................ 166
Wiring Diagram ....................................................... 167
DTC P0327, P0328 KNOCK SENSOR CIRCUIT
Diagnostic Procedure ............................................. 168
Component Description ......................................... 141 Component Inspection ........................................... 169
On Board Diagnosis Logic .................................... 141 Remove and Installation ........................................ 169
DTC Confirmation Procedure ................................ 141
CONTENTS
DTC P1225 CLOSED THROTTLE POSITION SEN- Wiring Diagram ....................................................... 200
SOR LEARNING PERFORMANCE PROBLEM Diagnostic Procedure ............................................. 201
Component Description ......................................... 170 Component Inspection ........................................... 204
On Board Diagnosis Logic .................................... 170 Remove and Installation ........................................ 204
DTC Confirmation Procedure ................................ 170 DTC P0500 VEHICLE SPEED SENSOR
Diagnostic Procedure ............................................. 171 Description ............................................................... 205
Remove and Installation ........................................ 171 On Board Diagnosis Logic .................................... 205
DTC P1226 CLOSED THROTTLE POSITION SEN- DTC Confirmation Procedure ................................ 205
SOR LEARNING PERFORMANCE PROBLEM Wiring Diagram ....................................................... 207
Component Description ......................................... 172 Diagnostic Procedure ............................................. 208
On Board Diagnosis Logic .................................... 172 DTC P1111 INTAKE VALVE TIMING CONTROL
DTC Confirmation Procedure ................................ 172 SOLENOID VALVE CIRCUIT
Diagnostic Procedure ............................................. 173 Description ............................................................... 209
Remove and Installation ........................................ 173 Component Description ......................................... 209
DTC P1229 SENSOR POWER SUPPLY CIRCUIT On Board Diagnosis Logic .................................... 210
SHORT DTC Confirmation Procedure ................................ 210
On Board Diagnosis Logic .................................... 174 Wiring Diagram ....................................................... 211
Fail-Safe Mode ........................................................ 174 Diagnostic Procedure ............................................. 212
DTC Confirmation Procedure ................................ 174 Component Inspection ........................................... 213
Wiring Diagram ....................................................... 175 Removal and Installation ....................................... 213
Diagnostic Procedure ............................................. 176 EVAP CANISTER PURGE VOLUME CONTROL
DTC P2122, P2123 ACCEL SENSOR - 1 SOLENOID VALVE
Component Description ......................................... 178 Description ............................................................... 214
On Board Diagnosis Logic .................................... 178 Component Description ......................................... 214
Fail-Safe Mode ........................................................ 178 Wiring Diagram ....................................................... 215
DTC Confirmation Procedure ................................ 179 Diagnostic Procedure ............................................. 217
Wiring Diagram ....................................................... 180 Component Inspection ........................................... 220
Diagnostic Procedure ............................................. 181 Removal and Installation ....................................... 220
Component Inspection ........................................... 184 INJECTOR CIRCUIT
Remove and Installation ........................................ 184 Component Description ......................................... 221
DTC P2127, P2128 ACCEL SENSOR - 2 Wiring Diagram ....................................................... 222
Component Description ......................................... 185 Diagnostic Procedure ............................................. 223
On Board Diagnosis Logic .................................... 185 Component Inspection ........................................... 226
Fail-Safe Mode ........................................................ 185 Removal and Installation ....................................... 226
DTC Confirmation Procedure ................................ 186 DTC P0171 FUEL INJECTION SYSTEM FUNCTION
Wiring Diagram ....................................................... 187 TOO LEAN
Diagnostic Procedure ............................................. 188 On Board Diagnosis Logic .................................... 227
Component Inspection ........................................... 191 DTC Confirmation Procedure ................................ 227
Remove and Installation ........................................ 191 Wiring Diagram ....................................................... 228
DTC P2135 THROTTLE SENSOR SIGNAL DISCOR- Diagnostic Procedure ............................................. 229
DANCE PROBLEM DTC P0172 FUEL INJECTION SYSTEM FUNCTION
Component Description ......................................... 192 TOO RICH
On Board Diagnosis Logic .................................... 192 On Board Diagnosis Logic .................................... 232
Fail-Safe Mode ........................................................ 192 DTC Confirmation Procedure ................................ 232
DTC Confirmation Procedure ................................ 192 Wiring Diagram ....................................................... 233
Wiring Diagram ....................................................... 194 Diagnostic Procedure ............................................. 234
Diagnostic Procedure ............................................. 195
FUEL PUMP CIRCUIT
Component Inspection ........................................... 197
Remove and Installation ........................................ 197 Description ............................................................... 237
Component Description ......................................... 237
DTC P2138 ACCELERATOR PEDAL POSITION SEN-
Wiring Diagram ....................................................... 238
SOR CIRCUIT RANGE/ PERFORMANCE PROBLEM
Diagnostic Procedure ............................................. 239
Component Description ......................................... 198 Component Inspection ........................................... 242
On Board Diagnosis Logic .................................... 198
Fail-Safe Mode ........................................................ 198
DTC Confirmation Procedure ................................ 199
CONTENTS
DTC P0550 POWER STEERING PRESSURE SEN- DTC P0037, P0038 HEATED OXYGEN SENSOR
SOR CIRCUIT HEATER CONTROL CIRCUIT - RR
Component Description ......................................... 243 System Description ................................................. 282
On Board Diagnosis Logic .................................... 243 Operation .................................................................. 282
DTC Confirmation Procedure ................................ 243 On Board Diagnosis Logic .................................... 282
Wiring Diagram ....................................................... 244 DTC Confirmation Procedure ................................ 282
Diagnostic Procedure ............................................. 245 Wiring Diagram ....................................................... 283
Component Inspection ........................................... 246 Diagnostic Procedure ............................................. 284
DTC P0132 HEATED OXYGEN SENSOR - FR CIR- Component Inspection ........................................... 285
CUIT HIGH VOLTAGE ELECTRICAL LOAD SIGNAL
Component Description ......................................... 247 Wiring Diagram ....................................................... 287
On Board Diagnosis Logic .................................... 247 Diagnostic Procedure ............................................. 289
DTC Confirmation Procedure ................................ 248 DTC P1805 BRAKE SWITCH
Wiring Diagram ....................................................... 249
Description ............................................................... 294
Diagnostic Procedure ............................................. 250
On Board Diagnosis Logic .................................... 294
Component Inspection ........................................... 251
Fail-Safe Mode ........................................................ 294
Removal and Installation ....................................... 252
DTC Confirmation Procedure ................................ 294
DTC P0134 HEATED OXYGEN SENSOR - FR CIR- Wiring Diagram ....................................................... 295
CUIT NO ACTIVITY DETECTED Diagnostic Procedure ............................................. 296
Component Description ......................................... 253 Component Inspection ........................................... 299
On Board Diagnosis Logic .................................... 253 PARK/NEUTRAL POSITION (PNP) SWITCH
Overall Function Check .......................................... 254
Component Description ......................................... 300
Wiring Diagram ....................................................... 255
Wiring Diagram ....................................................... 301
Diagnostic Procedure ............................................. 256
Diagnostic Procedure ............................................. 302
Component Inspection ........................................... 257
Removal and Installation ....................................... 258 REFRIGERANT PRESSURE SENSOR
HEATED OXYGEN SENSOR 1 HEATER (FR) Component Description ......................................... 304
Wiring Diagram ....................................................... 305
Description ............................................................... 259
Diagnostic Procedure ............................................. 306
Operation .................................................................. 259
Wiring Diagram ....................................................... 260 DTC P0605 ENGINE CONTROL MODULE
Diagnostic Procedure ............................................. 261 Component Description ......................................... 309
Component Inspection ........................................... 263 On Board Diagnosis Logic .................................... 309
Removal and Installation ....................................... 263 Fail-Safe Mode ........................................................ 309
HEATED OXYGEN SENSOR 1 (FR) DTC Confirmation Procedure ................................ 309
Wiring Diagram ....................................................... 312
Component Description ......................................... 264
Wiring Diagram ....................................................... 265 EVAPORATIVE EMISSION SYSTEM
Diagnostic Procedure ............................................. 266 Description ............................................................... 313
Component Inspection ........................................... 269 Vacuum Lines in Evaporative Emission System
Removal and Installation ....................................... 270 ................................................................................... 314
DTC P0138 HEATED OXYGEN SENSOR - Component Inspection ........................................... 315
RR CIRCUIT HIGH VOLTAGE POSITIVE CRANKCASE VENTILATION
Component Description ......................................... 271 Description ............................................................... 316
On Board Diagnosis Logic .................................... 271 Component Inspection ........................................... 316
DTC Confirmation Procedure ................................ 271 SERVICE DATA AND SPECIFICATIONS (SDS)
Wiring Diagram ....................................................... 273
Fuel Pressure ........................................................... 318
Diagnostic Procedure ............................................. 274
Idle Speed and Ignition Timing ............................. 318
Component Inspection ........................................... 275
Mass Air Flow Sensor ............................................ 318
DTC P0031, P0032 HEATED OXYGEN SENSOR Intake Air Temperature Sensor ............................. 318
HEATER CONTROL CIRCUIT - FR Engine Coolant Temperature Sensor ................... 318
System Description ................................................. 277 Crankshaft Position Sensor (POS) ...................... 318
Operation .................................................................. 277 Crankshaft Position Sensor (PHASE) ................. 318
On Board Diagnosis Logic .................................... 277 Throttle Control Motor ............................................ 318
DTC Confirmation Procedure ................................ 277 Injector ...................................................................... 319
Wiring Diagram ....................................................... 279 Fuel Pump ................................................................ 319
Diagnostic Procedure ............................................. 280
Component Inspection ........................................... 281
PRECAUTIONS AND PREPARATION [QG16]
Precautions
Supplemental Restraint System (SRS) "AIR BAG"
and "SEAT BELT PRE-TENSIONER"
WARNING:
To install/remove the SRS airbag, pretensioner seatbelt sys-
tem related components and harness, turn the ignition switch
"OFF", disconnect the battery terminals and wait over 3 min-
utes. (This is to discharge all the remaining electricity in the
airbag sensor unit's auxiliary power circuit.)
Do not use air impact or electrical tools when installing/re-
moving the components.
Do not use any hand-held tools for harness used in SRS airbag
and pretensioner seatbelt systems. Be careful with the har-
ness not to tangle with or interfere with other components.
Do not use any electrical test equipments such as circuit tester
when inspecting the SRS airbag and pretensioner seatbelt
circuit while installed unless the Service Manual instructs to
do so. (The weak current in the tester can cause the SRS airbag
to operate.)
Do not insert any foreign materials such as a screwdriver in
the airbag module and pretensioner seatbelt connector in or-
der to prevent unintended operation due to static electricity.
The harnesses used in SRS airbag and pretensioner are cov-
ered with yellow insulation for easy identification.
Refer to "RS Restraint System" in this Service Manual for safe
airbag system service information.
ON BOARD DIAGNOSTIC (OBD) SYSTEM OF ENGINE
The ECM has an on board diagnostic system. It will light up the
malfunction indicator (MIL) to warn the driver of a malfunction
causing emission deterioration.
CAUTION:
Be sure to turn the ignition switch OFF and disconnect the
battery ground cable before any repair or inspection work.
The open/short circuit of related switches, sensors, sole-
noid valves, etc. will cause the MIL to light up.
Be sure to connect and lock the connectors securely after
work. A loose (unlocked) connector will cause the MIL to
light up due to the open circuit. (Be sure the connector is
free from water, grease, dirt, bent terminals, etc.)
Be sure to route and secure the harnesses properly after
work. The interference of the harness with a bracket, etc.
may cause the MIL to light up due to the short circuit.
Be sure to erase the unnecessary malfunction informa-
tion (repairs completed) from the ECM before returning
the vehicle to the customer.
PRECAUTION
Always use a 12 volt battery as power source.
Do not attempt to disconnect battery cables while engine is
running.
Before connecting or disconnecting the ECM harness con-
nector, turn ignition switch OFF and disconnect battery ground
cable. Failure to do so may damage the ECM because bat-
tery voltage is applied to ECM even if ignition switch is turned
off.
Before removing parts, turn ignition switch OFF and then
disconnect battery ground cable.
EC-5
[QG16] PRECAUTIONS AND PREPARATION
Precautions (Cont'd)
Do not disassemble ECM.
If battery cable is disconnected, the memory will return to
the initial ECM values. The ECM will now start to self-con-
trol at its initial values. Engine operation can vary slightly
when the cable is disconnected. However, this is not an indi-
cation of a malfunction. Do not replace parts because of a
slight variation.
When connecting ECM harness connector, fasten it securely
with a lever as far as it will go as shown at right.
When connecting or disconnecting pin connectors into or from
ECM, take care not to damage pin terminals (bend or break).
Make sure that there are not any bends or breaks on ECM
pin terminal, when connecting pin connectors.
Securely connect ECM harness connectors. A poor connec-
tion can cause an extremely high (surge) voltage to develop
in coil and condenser, thus resulting in damage to ICs.
Keep engine control system harness at least 10 cm (4 in)
away from adjacent harness, to prevent engine control sys-
tem malfunctions due to receiving external noise, degraded
operation of ICs, etc.
Keep engine control system parts and harness dry.
Before replacing ECM, perform "ECM Terminals and Refer-
ence Value" inspection and make sure ECM functions prop-
erly. Refer to EC-53, "ECM Terminals and Reference Value".
Handle mass air flow sensor carefully to avoid damage.
Do not disassemble mass air flow sensor.
Do not clean mass air flow sensor with any type of deter-
gent.
Do not disassemble electric throttle control actuator.
Even a slight leak in the air intake system can cause serious
incidents.
Do not shock or jar the camshaft position sensor (PHASE),
crankshaft position sensor (POS).
Perform ECM input/output signal inspection before replace-
ment.
EC-6
PRECAUTIONS AND PREPARATION [QG16]
Precautions (Cont'd)
After performing each TROUBLE DIAGNOSIS, perform DTC
Confirmation Procedure or Overall Function Check. The DTC
should not be displayed in the DTC Confirmation Procedure
if the repair is completed. The Overall Function Check should
be a good result if the repair is completed.
When measuring ECM signals with a circuit tester, connect
a break-out box and Y-cable adapter between the ECM and
ECM harness connector.
When measuring ECM signals with a circuit tester, never al-
low the two tester probes to contact. Accidental contact of
probes will cause a short circuit and damage the ECM power
transistor.
Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM's
transistor. Use a ground other than ECM terminals, such as
the ground.
Do not operate fuel pump when there is no fuel in lines.
Tighten fuel hose clamps to the specified torque.
EC-7
[QG16] PRECAUTIONS AND PREPARATION
Precautions (Cont'd)
Do not depress accelerator pedal when starting.
Immediately after starting, do not rev up engine unneces-
sarily.
Do not rev up engine just prior to shutdown.
When installing C.B. ham radio or a mobile phone, be sure
to observe the following as it may adversely affect electronic
control systems depending on installation location.
- Keep the antenna as far as possible from the electronic
control units.
- Keep the antenna feeder line more than 20 cm (8 in) away
from the harness of electronic controls. Do not let them
run parallel for a long distance.
- Adjust the antenna and feeder line so that the
standingwave radio can be kept smaller.
- Be sure to ground the radio to vehicle body.
Wiring Diagrams and Trouble Diagnosis
When you read wiring diagrams, refer to the following:
"HOW TO READ WIRING DIAGRAMS", GI-8
"POWER SUPPLY ROUTING", EL-5 for power distribution
circuit
When you perform trouble diagnosis, refer to the following:
"HOW TO PERFORM EFFICIENT DIAGNOSES FOR AN
ELECTRICAL INCIDENT", GI-14.
EC-8
PRECAUTIONS AND PREPARATION [QG16]
Preparation
Special Service Tools
Tool Number and Name Description
EG17650301 Adapting radiator cap tester to radiator
Radiator cap tester adapter filler neck
a: 28 (1.10) dia.
b: 31.4 (1.236) dia.
c: 41.3 (1.626) dia.
Unit: mm (in)
Commercial Service Tools
Tool Number and Name Description
Fuel filler cap adapter Checking fuel tank vacuum relief valve
opening pressure
Socket wrench Removing and installing engine coolant
temperature sensor
Oxygen sensor thread cleaner Reconditioning the exhaust system threads
before installing a new oxygen sensor. Use
with anti-seize lubricant shown below.
a: 18 mm diameter with pitch 1.5 mm for
Zirconia Oxygen Sensor
b: 12 mm diameter with pitch 1.25 mm for
Titania Oxygen Sensor
EC-9
[QG16] PRECAUTIONS AND PREPARATION
MEMO:
EC-10
INDEX FOR DTC [QG16]
Index for DTC
DTC No. Index
NOTE:
If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for
DTC U1000, U1001. Refer to EC-81, "DTC U1000, U1001 CAN COMMUNICATION LINE".
O: Applicable X: Not applicable
DTC Items MIL Reference
CONSULT-II ECM (CONSULT-II Screen Terms) Lighting Up Page
P0000 0000 NO DTC IS DETECTED. FURTHER TESTING MAY BE REQUIRED. X -
U1000 1000 CAN COMM CIRCUIT X EC-81
U1001 1001 CAN COMM CIRCUIT X EC-81
U0426 0426 - X EC-81
P0031 0031 HO2S1 HTR (B1) X EC-277
P0032 0032 HO2S1 HTR (B1) X EC-277
P0037 0037 HO2S2 HTR (B1) X EC-282
P0038 0038 HO2S2 HTR (B1) X EC-282
P0102 0102 MAF SEN/CIRCUIT X EC-103
P0103 0103 MAF SEN/CIRCUIT X EC-103
P0112 0112 IAT SEN/CIRCUIT X EC-109
P0113 0113 IAT SEN/CIRCUIT X EC-109
P0117 0117 ECT SEN/CIRCUIT O EC-113
P0118 0118 ECT SEN/CIRCUIT O EC-113
P0122 0122 TP SEN 2/CIRC X EC-145
P0123 0123 TP SEN 2/CIRC X EC-145
P0132 0132 HO2S1 (B1) X EC-247
P0134 0134 HO2S1 (B1) X EC-253
P0138 0138 HO2S2 (B1) X EC-271
P0171 0171 FUEL SYS-LEAN-B1 X EC-227
P0172 0172 FUEL SYS-RICH-B1 X EC-232
P0222 0222 TP SEN 1/CIRC X -
P0223 0223 TP SEN 1/CIRC X -
P0327 0327 KNOCK SEN/CIRC-B1 X EC-141
P0328 0328 KNOCK SEN/CIRC-B1 X EC-141
P0335 0335 CKP SEN/CIRCUIT X EC-96
P0340 0340 CMP SEN/CIRC-B1 X EC-89
P0350 0350 IGN SIGNAL-PRIMARY X EC-118
P0500 0500 VEH SPEED SEN/CIRC X EC-205
P0550 0550 PW ST P SEN/CIRC X EC-243
P0605 0605 ECM O EC-309
P0633 0633 - X *1
P1065 1065 ECM BACK UP/CIRC X EC-85
P1111 1111 INT/V TIM V/CIR-B1 X EC-209
P1121 1121 ETC ACTR X EC-151
P1122 1122 ETC FUNCTION/CIRC X EC-153
P1124 1124 ETC MOT PWR X EC-160
P1126 1126 ETC MOT PWR X EC-160
P1128 1128 ETC MOT X EC-166
EC-11
[QG16] INDEX FOR DTC
Index for DTC (Cont'd)
DTC Items MIL Reference
CONSULT-II ECM (CONSULT-II Screen Terms) Lighting Up Page
P1217 1217 ENG OVER TEMP O EC-127
P1225 1225 CTP LEARNING X EC-170
P1226 1226 CTP LEARNING X EC-172
P1229 1229 SENSOR POWER/CIRC X EC-174
P1805 1805 BRAKE SW/CIRCUIT X EC-294
P2122 2122 APP SEN 1/CIRC X EC-178
P2123 2123 APP SEN 1/CIRC X EC-178
P2127 2127 APP SEN 2/CIRC X EC-185
P2128 2128 APP SEN 2/CIRC X EC-185
P2135 2135 TP SENSOR X EC-192
P2138 2138 APP SENSOR X EC-198
*1: If this code is displayed, register ECM to combination meter. Refer to "CONSULT-II OPERATION MANUAL NATS".
EC-12
ENGINE CONTROL SYSTEM [QG16]
Engine Control System
General
The ECCS (Electronic Concentrated engine Control System)
controls the fuel injection, ignition timing and idle RPM as one
single control unit. CONSULT-II can check and diagnose ECCS
functions easily.
ECCS Controls
Control Item Description
Fuel injection control SOFIS control is adopted to enhance responses and exhaust efficiency by
optimizing fuel injection amount.
It improves drivability by performing compensations under extreme condi-
tions such as sudden oxygen changes through oxygen feedback learning
control.
It minimizes exhaust gases by employing the oxygen sensor.
Ignition timing control It optimizes the ignition timing at various circumstances by employing the
hole IC type crankshaft position sensor.
It improves ignition performance by employing the DLI (Distributorless
Ignition) system that has power transistor integrated ignition coil on each
cylinder.
It optimizes ignition timing by employing the knock control that advances or
retards ignition timing according to knocking conditions during different
driving conditions and used fuel quality.
Idle RPM control It controls idle speed by operating DC motor directly.
Fuel pump drive control It controls the fuel pump relay on and off according to engine RPM signals.
A/C cut control It minimizes engine load by turning the A/C relay off under high refrigerant
pressure and high engine speed.
Radiator fan control It controls the radiator fan relay on and off according to vehicle speed,
coolant temperature and A/C signal.
Canister purge control It performs duty control on the canister according to driving conditions.
Engine and automatic transaxle It minimizes gear shift shock by reducing the engine torque during gear
integrated control changes.
Fail-safe function It allows safety and emergency driving under system defectives.
Diagnosis system It corresponds with CONSULT-II for easy diagnosing.
EC-13
[QG16] ENGINE CONTROL SYSTEM
System Diagram
EC-14
ENGINE CONTROL SYSTEM [QG16]
Engine Control System (Cont'd)
Vacuum Hose Drawing
NOTE:
Do not use soapy water or any type of solvent while installing vacuum hose or purge hoses.
Refer to EC-14, "System Diagram" for Vacuum Control System.
EC-15
[QG16] ENGINE CONTROL SYSTEM
Engine Control System (Cont'd)
System Chart
Input (Sensor) ECM Function Output (Actuator)
Camshaft position sensor (PHASE) Fuel injection & mixture ratio control Fuel injectors
Crankshaft position sensor (POS) Electronic ignition system Power transistor
Mass air flow sensor
Fuel pump control Fuel pump relay
Engine coolant temperature sensor
Heated oxygen sensor 1 On board diagnostic system MIL (On the instrument panel)
Throttle position sensor Intake valve timing control Intake valve timing control solenoid valve
Accelerator pedal position sensor Heated oxygen sensor 1 heater control Heated oxygen sensor 1 heater
Park/neutral position (PNP) switch
EVAP canister purge flow control EVAP canister purge volume control
Intake air temperature sensor
Power steering pressure sensor solenoid valve
Ignition switch Air conditioning cut control Air conditioner relay
Stop lamp switch
Battery voltage
Knock sensor
Refrigerant pressure sensor
TCM (Transmission control Cooling fan control Cooling fan relays
module)*1
Air conditioner switch
Vehicle speed signal
Electrical load signal
*1: This input signal is sent to the ECM through CAN communication line.
Multiport Fuel Injection (MFI) System
INPUT/OUTPUT SIGNAL CHART
Sensor Input Signal to ECM ECM Function Actuator
Crankshaft position sensor (POS)
Engine speed*1 and piston position
Camshaft position sensor (PHASE)
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Heated oxygen sensor 1 Density of oxygen in exhaust gas
Throttle position sensor Throttle position Fuel injection &
Fuel injectors
Accelerator pedal position sensor Accelerator pedal position mixture ratio control
Park/neutral position (PNP) switch Gear position
Knock sensor Engine knocking condition
Battery Battery voltage*1
Power steering pressure sensor Power steering operation
Vehicle speed signal Vehicle speed
Air conditioner switch Air conditioner operation
*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the
length of time the valve remains open (injection pulse duration). The amount of fuel injected is a pro-
gram value in the ECM memory. The program value is preset by engine operating conditions. These
conditions are determined by input signals (for engine speed and intake air) from the crankshaft posi-
tion sensor (POS), camshaft position sensor (PHASE) and the mass air flow sensor.
EC-16
ENGINE CONTROL SYSTEM [QG16]
Engine Control System (Cont'd)
VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION
In addition, the amount of fuel injected is compensated to improve engine performance under various
operating conditions as listed below.
During warm-up
When starting the engine
During acceleration
Hot-engine operation
When selector lever is changed from N to D (A/T models)
High-load, high-speed operation
During deceleration
During high engine speed operation
Mixture Ratio Feedback Control (Closed Loop Control)
The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission
control. The three way catalyst (manifold) can then better reduce CO, HC and NOx emissions. This sys-
tem uses heated oxygen sensor 1 in the exhaust manifold to monitor if the engine operation is rich or lean.
The ECM adjusts the injection pulse width according to the sensor voltage signal. For more information
about heated oxygen sensor 1, refer to EC-247. This maintains the mixture ratio within the range of
stoichiometric (ideal airfuel mixture). This stage is referred to as the closed loop control condition.
OPEN LOOP CONTROL
The open loop system condition refers to when the ECM detects any of the following conditions. Feed-
back control stops in order to maintain stabilized fuel combustion.
Deceleration and acceleration
High-load, high-speed operation
Malfunction of heated oxygen sensor 1 or its circuit
Insufficient activation of heated oxygen sensor 1 at low engine coolant temperature
High engine coolant temperature
During warm-up
After shifting from N to D (A/T models)
When starting the engine
MIXTURE RATIO SELF-LEARNING CONTROL
The mixture ratio feedback control system monitors the mixture ratio signal transmitted from heated
oxygen sensor 1. This feedback signal is then sent to the ECM. The ECM controls the basic mixture
ratio as close to the theoretical mixture ratio as possible. However, the basic mixture ratio is not neces-
sarily controlled as originally designed. Both manufacturing differences (i.e., mass air flow sensor hot
film) and characteristic changes during operation (i.e., injector clogging) directly affect mixture ratio.
EC-17
[QG16] ENGINE CONTROL SYSTEM
Engine Control System (Cont'd)
Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system.
This is then computed in terms of "injection pulse duration" to automatically compensate for the differ-
ence between the two ratios.
"Fuel trim" refers to the feedback compensation value compared against the basic injection duration.
Fuel trim includes short term fuel trim and long term fuel trim.
"Short term fuel trim" is the short-term fuel compensation used to maintain the mixture ratio at its
theoretical value. The signal from heated oxygen sensor 1 indicates whether the mixture ratio is RICH
or LEAN compared to the theoretical value. The signal then triggers a reduction in fuel volume if the
mixture ratio is rich, and an increase in fuel volume if it is lean.
"Long term fuel trim" is overall fuel compensation carried out long-term to compensate for continual
deviation of the short term fuel trim from the central value. Such deviation will occur due to individual
engine differences, wear over time and changes in the usage environment.
FUEL INJECTION TIMING
Two types of systems are used.
SEQUENTIAL MULTIPORT FUEL INJECTION SYSTEM
Fuel is injected into each cylinder during each engine cycle according to the firing order. This system is
used when the engine is running.
SIMULTANEOUS MULTIPORT FUEL INJECTION SYSTEM
Fuel is injected simultaneously into all four cylinders twice each engine cycle. In other words, pulse
signals of the same width are simultaneously transmitted from the ECM. The four injectors will then
receive the signals two times for each engine cycle. This system is used when the engine is being
started and/or if the fail-safe system (CPU) is operating.
FUEL SHUT-OFF
Fuel to each cylinder is cut off during deceleration or operation of the engine at excessively high speeds.
Electronic Ignition (EI) System
INPUT/OUTPUT SIGNAL CHART
Sensor Input Signal to ECM ECM Function Actuator
Crankshaft position sensor (POS)
Engine speed*1 and piston position
Camshaft position sensor (PHASE)
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Throttle position sensor Throttle position
Ignition timing control Power transistor
Accelerator pedal position sensor Accelerator pedal position
Knock sensor Engine knocking condition
Park/neutral position (PNP) switch Gear position
Battery Battery voltage*1
Vehicle speed signal Vehicle speed
*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.
EC-18
ENGINE CONTROL SYSTEM [QG16]
Engine Control System (Cont'd)
SYSTEM DESCRIPTION
The ignition timing is controlled by the ECM to maintain the
best airfuel ratio for every running condition of the engine. The
ignition timing data is stored in the ECM. This data forms the
map shown. The ECM receives information such as the injec-
tion pulse width and camshaft position sensor signal. Comput-
ing this information, ignition signals are transmitted to the power
transistor. e.g., N: 1,800 rpm, Tp: 1.50 msec A ◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo