Infiniti G35 (V35). Manual — part 355
DTC P0138, P0158 HO2S2
EC-301
C
D
E
F
G
H
I
J
K
L
M
A
EC
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
25
P/B
Heated oxygen sensor 2
heater (bank 1)
[Engine is running]
●
Engine speed: Below 3,600 rpm after the
following conditions are met.
–
Engine: After warming up
–
Keeping the engine speed between 3,500
and 4,000 rpm for 1 minute and at idle for 1
minute under no load.
0 - 1.0V
[Ignition switch: ON]
●
Engine stopped
[Engine is running]
●
Engine speed: Above 3,600 rpm
BATTERY VOLTAGE
(11 - 14V)
74
L/B
Heated oxygen sensor 2
(bank 1)
[Engine is running]
●
Revving engine from idle to 3,000 rpm
quickly after the following conditions are
met.
–
Engine: After warming up
–
Keeping the engine speed between 3,500
and 4,000 rpm for 1 minute and at idle for 1
minute under no load.
0 - Approximately 1.0V
78
B/Y
Sensor ground
(Heated oxygen sensor)
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 0V
EC-302
DTC P0138, P0158 HO2S2
BANK 2
TBWM1616E
DTC P0138, P0158 HO2S2
EC-303
C
D
E
F
G
H
I
J
K
L
M
A
EC
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic Procedure
NBS001O1
PROCEDURE FOR MALFUNCTION A
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten two ground screws on the body. Refer to
.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
6
BR/W
Heated oxygen sensor 2
heater (bank 2)
[Engine is running]
●
Engine speed: Below 3,600 rpm after the
following conditions are met.
–
Engine: After warming up
–
Keeping the engine speed between 3,500
and 4,000 rpm for 1 minute and at idle for 1
minute under no load.
0 - 1.0V
[Ignition switch: ON]
●
Engine stopped
[Engine is running]
●
Engine speed: Above 3,600 rpm
BATTERY VOLTAGE
(11 - 14V)
55
R/Y
Heated oxygen sensor 2
(bank 2)
[Engine is running]
●
Revving engine from idle to 3,000 rpm
quickly after the following conditions are
met.
–
Engine: After warming up
–
Keeping the engine speed between 3,500
and 4,000 rpm for 1 minute and at idle for 1
minute under no load.
0 - Approximately 1.0V
78
B/Y
Sensor ground
(Heated oxygen sensor)
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 0V
PBIB2192E
EC-304
DTC P0138, P0158 HO2S2
2.
CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1.
Disconnect heated oxygen sensor 2 harness connector.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between ECM terminal 78 and HO2S2 terminal 1.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
3.
CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check harness continuity between ECM terminal and HO2S2 terminal as follows.
Refer to Wiring Diagram.
2.
Check harness continuity between the following terminals and ground.
Refer to Wiring Diagram.
3.
Also check harness for short to power.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
Continuity should exist.
PBIB1908E
DTC
Terminals
Bank
ECM
Sensor
P0138
74
4
1
P0158
55
4
2
Continuity should exist.
DTC
Terminals
Bank
ECM
Sensor
P0138
74
4
1
P0158
55
4
2
Continuity should not exist.
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