Infiniti FX35 / FX45. Manual — part 521
DTC P0138, P0158 HO2S2
EC-845
< SERVICE INFORMATION >
[VK45DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
BANK 2
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.
TBWM1331E
EC-846
< SERVICE INFORMATION >
[VK45DE]
DTC P0138, P0158 HO2S2
Diagnosis Procedure
INFOID:0000000001326686
PROCEDURE FOR MALFUNCTION A
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten three ground screws on the body.
Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
TER-
MI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
25
P
Heated oxygen sensor 2
heater (Bank 2)
[Engine is running]
• Engine speed: Below 3,600 rpm after the fol-
lowing 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
LG/B
Heated oxygen sensor 2
(Bank 2)
[Engine is running]
• Revving engine from idle to 3,000 rpm quick-
ly after the following conditions are met
- Engine: After warming up
- After 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/R
Sensor ground
(Heated oxygen sensor 2)
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 0V
PBIB2195E
DTC P0138, P0158 HO2S2
EC-847
< SERVICE INFORMATION >
[VK45DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
1.
Disconnect heated oxygen sensor 2 harness connector.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between HO2S2 terminal 4 and ECM terminal 78.
Refer to Wiring Diagram.
4.
Also check harness for short to ground or 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.
4.
CHECK HO2S2 CONNECTOR FOR WATER
Check connectors for water.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace harness or connectors.
5.
CHECK HEATED OXYGEN SENSOR 2
Continuity should exist.
PBIB1534E
DTC
Terminals
Bank
ECM
Sensor
P0138
55
1
1
P0158
74
1
2
Continuity should exist.
DTC
Terminals
Bank
ECM
Sensor
P0138
55
1
1
P0158
74
1
2
Continuity should not exist.
Water should not exist.
EC-848
< SERVICE INFORMATION >
[VK45DE]
DTC P0138, P0158 HO2S2
EC-850, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace malfunctioning heated oxygen sensor 2.
6.
CHECK INTERMITTENT INCIDENT
>> INSPECTION END
PROCEDURE FOR MALFUNCTION B
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten three ground screws on the body.
Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CLEAR THE SELF-LEARNING DATA
With CONSULT-III
1.
Start engine and warm it up to normal operating temperature.
2.
Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT-III.
3.
Clear the self-learning control coefficient by touching “CLEAR”.
4.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172 or P0175 detected?
Is it difficult to start engine?
Without CONSULT-III
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF.
3.
Disconnect mass air flow sensor (1) harness connector, and
restart and run engine for at least 5 seconds at idle speed.
4.
Stop engine and reconnect mass air flow sensor harness con-
nector.
5.
Make sure DTC P0102 is displayed.
6.
Erase the DTC memory. Refer to
7.
Make sure DTC P0000 is displayed.
8.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172 or P0175 detected?
Is it difficult to start engine?
Yes or No
Yes
>> Perform trouble diagnosis for DTC P0172, P0175. Refer to
No
>> GO TO 3.
3.
CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
PBIB2195E
PBIB3230E
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