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DI-665
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDRM-01
DTC P0418 Air Injection System Air Pump Malfunction
CIRCUIT DESCRIPTION
Refer to DTC P0412 on page DI-656.
DTC No. DTC Detection Condition Trouble Area
All of the following conditions are met, when idling just after
S Open in air pump drive circuit
cold start. (1 trip detection logic):
S Short between air pump circuit and +B circuit
P0418 (a) Air injection system not operate
S Air injection driver
(b) Air injection driver outputs air pump malfunction signal (20%
S ECM
duty signal)
All of the following conditions are met, when idling just after
cold start.
S Short between air pump circuit and body ground
(1 trip detection logic):
P0418 S Air injection driver
(a) Air injection system operates
S ECM
(b) Air injection driver outputs air pump malfunction signal (20%
duty signal)
MONITOR DESCRIPTION
Air Injection Driver (AID) detects an open or short in the air pump and Air Switching Valve (ASV) circuit ac-
cording to the terminal voltage and sends a signal as diagnostic information to the ECM.
When the air injection system operation is required while the engine is warming up, the ECM transmits com-
mand signals to the AID to drive the air pump and ASV.
The AID inputs the command signal from ECM if: 1) VP terminal voltage is low despite the AID inputting the
command signal from the ECM to drive the ASV or 2) VP terminal voltage is high despite the AID not inputting
the command signal from the ECM.
The ECM sets the DTC based on the diagnostic information from the AID.
MONITOR STRATEGY
Related DTCs P0418 Air pump range check
Required sensors/components Air injection driver, Air pump
Frequency of operation Continuous
Duration 3 sec.
MIL operation Immediate
Sequence of operation None
DI-666
DIAGNOSTICS - ENGINE (2UZ-FE)
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever this DTC is
See page DI-437
not present
Case 1:
Air pump Operating
Air switching valve Operating
Battery voltage 8V -
Ignition switch ON
Starter OFF
Case 2:
Air pump Not operating
Air switching valve Not operating
Battery voltage 8V -
Ignition switch ON
Starter OFF
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
Case 1, 2:
Diagnostic signal duty ratio from air injection driver 11 to 29 %
COMPONENT OPERATING RANGE
Parameter Standard Value
70 to 90% when secondary air injection system operating
Diagnostic signal duty ratio from air injection driver and
0% when secondary air injection system not operating
WIRING DIAGRAM
Refer to DTC P0412 on page DI-656.
DI-667
DIAGNOSTICS - ENGINE (2UZ-FE)
INSPECTION PROCEDURE
HINT:
The diagnostic information output from the AID can be confirmed by connecting an oscilloscope to the diag-
nostic information terminal of the AID. It narrows the trouble area search to read the waveform on the oscillo-
scope when performing the AI system intrusive operation function provided in the SYSTEM CHECK.
(1) Start the engine and warm it up.
(2) Turn the ignition switch to OFF.
(3) Connect a hand-held tester to the DLC3.
(4) Connect an oscilloscope probe to the AIDI terminal
ECM Connector of the ECM.
(5) Start the engine and turn the tester ON.
(6) On the tester, select the following menu items:
DIAGNOSIS / ENHANCED OBD II / SYSTEM
CHECK / AIR INJ SYSTEM.
E1 AIDI
B17411
(7) On the tester, select the following menu items:
AIR INJ CHECK
AIR PUMP............................ON DIAGNOSIS / ENHANCED OBD II / SYSTEM
EASV ............................OPEN CHECK / AIR INJ CHECK / MANUAL OPERATION
ASV1. .............................OPEN
ASV2...............................OPEN / OPERATION 1 and 2.
A/F BANK1.......................19.05
A/F BANK2.......................19.05 HINT:
PRESSURE....................17 kPa OPERATION 1: AP: OFF, EASV:CLOSE, ASV1:CLOSE,
PULSATION..............25.39 kPa
AI STATUS...........................OK ASV2:CLOSE
Remaining Time 05 sec.
OPERATION 2: AP: ON, EASV:OPEN, ASV1:OPEN,
Press [EXIT] to quit
A16555 ASV2:OPEN
Example: 80% Duty Signal 5 V/DIV. (8) Monitor the voltage output of the AID (duty ratio sig-
nal).
Oscilloscope range:
Items Contents
Terminals CH1: AIDI - E1
GND
Equipment Settings 5 V/Division, 20 to 40 ms/Division
Conditions Idling
20 ms/DIV.
NOTICE:
S This AIR INJECTION CHECK only allows technicians to operate the AI system for 5 seconds.
Furthermore, the check can be performed 4 times a trip. If the test is repeated, intervals of at
least 30 seconds are required between checks.
While the AI system operation using the hand-held tester is prohibited, the tester displays the
prohibition (AI STATUS NG) or ERROR. At this time stop the engine for 10 minutes and then try
again.
S Performing the AIR INJ CHECK over and over again may cause the damage in the secondary
air injection system. If necessary, put an interval of several minutes between tests to prevent
overheating the system.
DI-668
DIAGNOSTICS - ENGINE (2UZ-FE)
AID Diagnostic Signal Waveforms ECM DTCs
Commands (ECM Output) Suspected Trouble Areas
100 % Duty ratio
Almost Battery Voltage Open in diagnostic signal circuit
+B Any Air Injection Air Injection Control Driver (AID)
(AI) System op- Open in AID+B circuit (AID power source)
P1613
eration Short between +B circuit and diagnostic signal circuit
GND
0 % Duty ratio Open or short in air pump or Air Switching Valve
(ASV) command signal circuit (ECM-AID)
AI System: ON Open in AID ground circuit
(Air pump ON, P1613 Short between diagnostic signal circuit and body
+B ground
ASV ON) AID
ECM
Fixed at Low Voltage AI System: OFF
GND (Air pump OFF, - Normal
ASV OFF)
20 % Duty ratio Short between air pump drive circuit and body ground
20 % Harness & connector (AID-Pump)
Air Pump: ON P0418 Air Pump
AID
+B ECM
Open in air pump drive circuit (AID-Pump) ,
or short between air pump drive circuit and +B
Air Pump: OFF P0418 Harness & connector (AID-Pump)
GND Air Pump
AID
ECM
40 % Duty ratio Short between ASV drive circuit and body ground
Harness & connector (AID-ASV)
40 % ASV: ON P0412 ASV
+B AID
ECM
Open in ASV drive circuit (AID-ASV),
or short between ASV drive circuit and +B
P0412 Harness & connector (AID-ASV)
GND ASV: OFF
AID
ASV
ECM
80 % Duty ratio
AI System: OFF
80 %
(Air pump OFF, P1613 AID
+B ECM
ASV OFF)
AI System: ON
GND (Air pump ON, Normal
ASV ON)
Excluding above P1613 AID
(excluding 0, 20, 40, 80, 100 % duty) Open in AID ground circuit
A23464
DI-669
DIAGNOSTICS - ENGINE (2UZ-FE)
HINT:
S Using the AIR INJ CHECK operation of the SYSTEM CHECK provided in the hand-held tester func-
tion, conditions for air-fuel ratio and pressure in the secondary air injection system passage can be
checked while the secondary air injection system operating. It helps technicians to troubleshoot the
system when it malfunctioning.
S Read freeze frame data using a hand-held tester. Freeze frame data record the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle
was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and
other data, from the time the malfunction occurred.
1 Check voltage between terminal 2 of air pump and body ground.
Wire Harness Side: PREPARATION:
(a) Remove the intake manifold (see page EM-36).
(b) Disconnect the A35 air pump connector.
A35 (c) Connect the hand-held tester to the DLC3.
(d) Turn the ignition switch ON and turn the tester ON.
CHECK:
(a) When the air pump is operated using the hand-held tes-
Air Pump Connector ter, measure voltage between terminal A35-2 of the air in-
B17438 jection driver connector and body ground.
(b) Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/ AIR INJ CHECK/
MANUAL OPERATION/OPERATION 1 and 3
HINT:
OPERATION 1: AP:OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
OPERATION 3: AP:ON, EASV:OPEN, ASV1:OPEN,
ASV2:OPEN
NOTICE:
This test only allows technicians to operate the AI system
for 5 seconds. Furthermore, the test can be performed 4
times a trip. If the test is repeated, intervals of at least 30
seconds are required between tests.
While the AI system operation using the hand-held tester
is prohibited, the tester displays the prohibition (WAIT or
ERROR). If the ERROR (AI STATUS NG) is displayed on the
tester, stop the engine for 10 minutes and then try again..
OK:
Standard:
Tester operation Tester Connection Specified Condition
Operation 3 A35-2 - Body ground 10 V or more
Operation 1 A35-2 - Body ground Below 1.0 V
NG Go to step 4.
OK
DI-670
DIAGNOSTICS - ENGINE (2UZ-FE)
2 Check air pump resistance.
Component Side: PREPARATION:
Air Pump Connector (a) Remove the intake manifold (see page EM-36).
(b) Disconnect the air pump connector.
CHECK:
A35 Measure the resistance of the air pump.
OK:
Standard:
Tester Connections Specified Conditions
Front View
A23498 A35-1 - A35-2 0.4 to 1.0
NG Replace air pump assembly.
OK
3 Check for open in harness and connector between air pump and body ground.
Wire Harness Side: PREPARATION:
(a) Remove the intake manifold (see page EM-36).
(b) Disconnect the A35 air pump connector.
A35 CHECK:
Check the resistance between the wire harness side connec-
tors and body ground.
OK:
Air Pump Connector Standard:
B17438 Tester Connection Specified Condition
A35-1 - Body ground Below 1
NG Repair or replace harness or connector.
OK
Check for intermittent problems
(See page DI-430).
DI-671
DIAGNOSTICS - ENGINE (2UZ-FE)
4 Check for open and short in harness and connector between air injection driver
and air pump.
Wire Harness Side: PREPARATION:
Air Injection Driver Connector (a) Remove the intake manifold (see page EM-36).
(b) Disconnect the A33 air injection driver connector.
A33
(c) Disconnect the A35 air pump connector.
CHECK:
Check the resistance between the wire harness side connec-
tors.
OK:
B17443 Standard:
Tester Connection Specified Condition
Wire Harness Side: VP (A33-2) - A35-2 Below 1
VP (A33-2) or A35-2 -
10 k or higher
Body ground
A35
Air Pump Connector
B17438
NG Repair or replace harness or connector.
OK
Replace air injection driver.
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