Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Tundra 2000-2006 Approved 04-06 techinfo.toyota.com ileaf 06toyrm 06toypdf 06rmsrc 06tundra di eg1grfe cip00373
<< Back | HomeMost service manuals and schematics are PDF files, so You will need Adobre Acrobat Reader to view : Acrobat Download Some of the files are DjVu format. Readers and resources available here : DjVu Resources
For the compressed files, most common are zip and rar. Please, extract files with Your favorite compression software ( WinZip, WinRAR ... ) before viewing. If a document has multiple parts, You should download all, before extracting.
Good luck. Repair on Your own risk. Make sure You know what You are doing.
Image preview - the first page of the document
>> Download cip00373 documenatation <<
Text preview - extract from the document
DI-90
DIAGNOSTICS - ENGINE (1GR-FE)
DIDT7-01
DTC P0037 Oxygen Sensor Heater Control Circuit Low
(Bank 1 Sensor 2)
DTC P0038 Oxygen Sensor Heater Control Circuit High
(Bank 1 Sensor 2)
DTC P0057 Oxygen Sensor Heater Control Circuit Low
(Bank 2 Sensor 2)
DTC P0058 Oxygen Sensor Heater Control Circuit High
(Bank 2 Sensor 2)
DI-91
DIAGNOSTICS - ENGINE (1GR-FE)
CIRCUIT DESCRIPTION
To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three-way cata-
lytic converter is used, but for the most efficient use of the three-way catalytic converter, the air-fuel ratio
must be precisely controlled so that it is always close to the stoichiometric air-fuel ratio.
The heated oxygen sensor has the characteristic which its output voltage changes suddenly in the vicinity
of the stoichiometric air-fuel ratio. This characteristic is used to detect the oxygen concentration in the ex-
haust gas and provide the ECM with feedback to control the air-fuel ratio.
When the air-fuel ratio becomes LEAN, the oxygen concentration in the exhaust increases and the heated
oxygen sensor informs the ECM of the LEAN condition (low voltage, i.e. less than 0.45 V).
When the air-fuel ratio is RICHER than the stoichiometric air-fuel ratio, the oxygen concentration in the ex-
haust gas is reduced and the heated oxygen sensor informs the ECM of the RICH condition (high voltage,
i.e. more than 0.45 V). The ECM judges by the voltage output from the heated oxygen sensor whether the
air-fuel ratio is RICH or LEAN and controls the injection time accordingly. However, if malfunction of the
heated oxygen sensor causes output of abnormal voltage, this disables the ECM for performing an accurate
air-fuel ratio control. The heated oxygen sensors include a heater which heats the zirconia element. The
heater is controlled by the ECM. When the intake air volume is low (the temperature of the exhaust gas is
low) current flows to the heater to heat the sensor for accurate oxygen concentration detection.
Atmospheric Air
Ideal Air-Fuel Mixture
Housing
Output Voltage
Solid Electrolyte
(Zirconia Element)
Platinum Electrode
Heater
Coating (Ceramic)
Cover Richer - Air Fuel Ratio - Leaner
Exhaust Gas
B17386
HINT:
The ECM provides a pulse width modulated control circuit to adjust current through the heater. The heated
oxygen sensor heater circuit uses a relay on the B+ side of the circuit.
Reference (Bank 1 Sensor 1 System Drawing):
EFI Relay Heated Oxygen Sensor ECM
From Heater HT1B
Battery EFI Fuse No.1 EFI Fuse
No.2 Sensor
OX1B
Duty
E2 Control
Ground
MREL
cmc0484
DI-92
DIAGNOSTICS - ENGINE (1GR-FE)
DTC No. DTC Detecting Condition Trouble Area
S Open in heater circuit of heated oxygen sensor
P0037 Heater current is less than 0.3 A when the heater operates with
o erates S Heated oxygen sensor heater
P0057 more than 10.5 V positive battery voltage S EFI relay
S ECM
S Short in heater circuit of heated oxygen sensor
P0038 S Heated oxygen sensor heater
When heater operates, heater current exceeds 2.0 A
P0058 S EFI relay
S ECM
HINT:
S Bank 1 refers to bank that includes cylinder No. 1.
S Bank 2 refers to bank that does not includes cylinder No. 1.
S Sensor 1 refers to the sensor closer to the engine assembly.
S Sensor 2 refers to the sensor farther away from the engine assembly.
MONITOR DESCRIPTION
The sensing portion of the heated oxygen sensor has a zirconia element which is used to detect oxygen
concentration in the exhaust. If the zirconia element is at the proper temperature and difference of the oxy-
gen concentration between the inside and outside surface of sensor is large, the zirconia element will gener-
ate voltage signals. In order to increase the oxygen concentration detecting capacity in the zirconia element,
the ECM supplements the heat from the exhaust with heat from a heating element inside the sensor. When
current in the sensor is out of the standard operating range, the ECM interprets this as a fault in the heated
oxygen sensor and sets a DTC.
Example:
The ECM will set a high current DTC if the current in the sensor is more than 2.0 A when the heater is OFF.
Similarly, the ECM will set a low current DTC if the current is less than 0.3 A when the heater is ON.
MONITOR STRATEGY
Rear HO2S heater (Bank 1) range check (Low
P0037
Current)
Rear HO2S heater (Bank 1) range check (High
P0038
Current)
Related DTC
R l t d DTCs
Rear HO2S heater (Bank 2) range check (Low
P0057
Current)
Rear HO2S heater (Bank 2) range check (High
P0058
Current)
Main sensors/components HO2S heater
Required sensors/components
R i d / t
Related sensors/components Vehicle speed sensor (VSS)
Frequency of operation Continuous
Duration 0.3 sec.
MIL operation Immediate
Sequence of operation None
DI-93
DIAGNOSTICS - ENGINE (1GR-FE)
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever these
See page DI-18
DTCs are not present
P0037, P0057 (Low current):
Battery voltage 10.5 V -
Engine Running
Starter OFF
Intrusive heating Not operating
All heater is turned OFF and intrusive
heating is operated when the following Condition (a) and (b)
conditions are met
(a) Heater ON
(b) Heater current - 0.3 A
P0038, P0058 (High current):
Case 1:
Battery voltage 10.5 V -
Engine Running
Starter OFF
Intrusive heating Not operating
Case 2:
Battery voltage 10.5 V -
All heater is turned OFF and intrusive
heating is operated when the following Condition (a) and (b)
conditions are met
(a) Heater ON
(b) Heater current 2A -
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
P0037, P0057 (Low current):
HO2S heater current during intrusive heating Less than 0.3 A (when battery voltage is 10.5 V or more)
P0038, P0058 (High current):
Case 1:
HO2S heater current 2 A or more
Case 2:
HO2S heater current during intrusive heating More than 2 A
COMPONENT OPERATING RANGE
Parameter Standard Value
HO2S heater current 0.4 to 1 A (at idle, warmed-up engine and +B: 11 to 14 V)
DI-94
DIAGNOSTICS - ENGINE (1GR-FE)
MONITOR RESULT
The test value and test limit information are described as shown in the following table. Check the monitor
result and test values after performing the monitor drive pattern (see page DI-27).
S TID (Test Identification Data) is assigned to each emissions-related component.
S TLT (Test Limit Type):
If TLT is 0, the component is malfunctioning when the test value is higher than the test limit.
If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
S CID (Component Identification Data) is assigned to each test value.
TID $04: HO2S heater
TLT CID Unit Conversion Description of Test Data Description of Test Limit
Multiply by 0.000076 Maximum HO2S heater current
1 $02 Malfunction threshold for HO2S heater
(A) (Bank 1 Sensor 2)
Multiply by 0.000076 Maximum HO2S heater current
1 $20 Malfunction threshold for HO2S heater
(A) (Bank 2 Sensor 2)
DI-95
DIAGNOSTICS - ENGINE (1GR-FE)
WIRING DIAGRAM
J/C J8 J/C
7 24 22
R R R R
J26 J27 IE1 ECM
A A
H4
Heated Oxygen Sensor
2 (Bank 1 Sensor 2)
Engine Room 1 HT1B
R 2 1 L
R/B E7
EFI +B HT
No. 2
18 OX1B
B-W 4 E1 OX 3
B
2 E7
W-L
B
J1
J/C (*1) (*1)
B R
W-L
2 GR-G
2
3 1 H6
Engine Room Heated Oxygen Sensor
EFI (Bank 2 Sensor 2)
R/B 5 HT2B
Relay 2 1 G-B
E6
+B HT
5 2
2
33
2 B-W 4 E1 OX 3 B OX2B
E6
E
B-R E
J65 (*1) (*1)
E J/C
2 W-B
Engine Room 28
2 R/B B-W
E7 E2
EFI
No. 1
GR-G BR
1 A
J/C
9 26 8
GR-G MREL
2 J26 J27 E3
A J18
J/C
B
W-B
Battery
EA EV
*1: Shielded
A23567
DI-96
DIAGNOSTICS - ENGINE (1GR-FE)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using hand-held tester. Because freeze frame records the engine conditions when
the malfunction is detected. When troubleshooting, it is useful to determine whether the vehicle was running
or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. when a malfunction
occurred.
1 Check resistance of heated oxygen sensor heater.
Components Side: PREPARATION:
+B HT Disconnect the H4 or H6 heated oxygen sensor connector.
CHECK:
Measure resistance between terminals of the heated oxygen
sensor.
OK:
Standard:
E1 OX Tester Connection Specified Condition
A21341
HT (H4-1) - +B (H4-2) 11 to 16 at 20◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo