Nissan Pathfinder. Manual — part 482
EC-234
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0138, P0158 HO2S2
Component Function Check
INFOID:0000000009178159
1.
PERFORM COMPONENT FUNCTION CHECK-1
Without CONSULT
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
6. Let engine idle for 1 minute.
7. Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
PERFORM COMPONENT FUNCTION CHECK-2
Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 3.
3.
PERFORM COMPONENT FUNCTION CHECK-3
Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Diagnosis Procedure
INFOID:0000000009178160
1.
INSPECTION START
Confirm the detected malfunction (A or B). Refer to
.
Which malfunction is detected?
A
>> GO TO 2.
B
>> GO TO 6.
DTC
ECM
Condition
Voltage
Connector
+
–
Terminal
P0138
F52
57
59
Revving up to 4,000 rpm under no load
at least 10 times
The voltage should be below 0.18 V at
least once during this procedure.
P0158
58
DTC
ECM
Condition
Voltage
Connector
+
–
Terminal
P0138
F52
57
59
Keeping engine speed at idle for 10
minutes
The voltage should be below 0.18 V
at least once during this procedure.
P0158
58
DTC
ECM
Condition
Voltage
Connector
+
–
Terminal
P0138
F52
57
59
Coasting from 80 km/h (50 MPH) with se-
lector lever in the D position
The voltage should be below 0.18 V at
least once during this procedure.
P0158
58
P0138, P0158 HO2S2
EC-235
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
2.
CHECK HO2S2 CONNECTOR FOR WATER
1. Disconnect heated oxygen sensor 2 harness connector.
2. Check that water is not inside connectors.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness or connectors.
3.
CHECK HO2S2 GROUND CIRCUIT
1. Disconnect heated oxygen sensor 2 harness connector.
2. Disconnect ECM harness connector.
3. Check the continuity between heated oxygen sensor 2 (HO2S2) harness connector and ECM harness
connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
4.
CHECK HO2S2 INPUT SIGNAL CIRCUIT
1. Check the continuity between HO2S2 harness connector and ECM harness connector.
2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and
ground.
3. Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
5.
CHECK HEATED OXYGEN SENSOR 2
Check heated oxygen sensor 2. Refer to
EC-238, "Component Inspection"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-49, "Intermittent Incident"
.
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F13
1
F52
59
Existed
P0158
2
F12
1
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F13
4
F52
57
Existed
P0158
2
F12
4
58
DTC
HO2S2
Ground
Continuity
Bank
Connector
Terminal
P0138
1
F13
4
Ground
Not existed
P0158
2
F12
4
DTC
ECM
Ground
Continuity
Connector
Terminal
P0138
F52
57
Ground
Not existed
P0158
58
EC-236
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0138, P0158 HO2S2
NO
>> Replace malfunctioning heated oxygen sensor 2. Refer to
EM-31, "Removal and Installation
EM-33, "Removal and Installation (bank 1)"
6.
CLEAR MIXTURE RATIO SELF-LEARNING VALUE
1. Clear the mixture ratio self-learning value. Refer to
.
2. 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
>> Perform trouble diagnosis for DTC P0172, P0175. Refer to
NO
>> GO TO 7.
7.
CHECK HO2S2 GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 2 harness connector.
3. Disconnect ECM harness connector.
4. Check the continuity between HO2S2 harness connector and ECM harness connector.
5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
8.
CHECK HO2S2 INPUT SIGNAL CIRCUIT
1. Check the continuity between HO2S2 harness connector and ECM harness connector.
2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and
ground.
3. Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
9.
CHECK HEATED OXYGEN SENSOR 2
Check heated oxygen sensor 2. Refer to
EC-238, "Component Inspection"
Is the inspection result normal?
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F13
1
F52
59
Existed
P0158
2
F12
1
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F13
4
F52
57
Existed
P0158
2
F12
4
58
DTC
HO2S2
Ground
Continuity
Bank
Connector
Terminal
P0138
1
F13
4
Ground
Not existed
P0158
2
F12
4
DTC
ECM
Ground
Continuity
Connector
Terminal
P0138
F52
57
Ground
Not existed
P0158
58
P0138, P0158 HO2S2
EC-237
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
YES
>> Check intermittent incident. Refer to
GI-49, "Intermittent Incident"
.
NO
>> Replace malfunctioning heated oxygen sensor 2. Refer to
EM-31, "Removal and Installation
EM-33, "Removal and Installation (bank 1)"
Component Inspection
INFOID:0000000009178161
1.
INSPECTION START
Will CONSULT be used?
Will CONSULT be used?
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
CHECK HEATED OXYGEN SENSOR 2
With CONSULT
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
2. Start engine and warm it up to the normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 1 minute.
6. Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select “HO2S2 (B1)/(B2)” as the monitor item
with CONSULT.
7. Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to
± 25%.
“HO2S2 (B1)/(B2)” should be above 0.68 V at least once when the “FUEL INJECTION” is + 25%.
“HO2S2 (B1)/(B2)” should be below 0.18 V at least once when the “FUEL INJECTION” is
− 25%.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace malfunctioning heated oxygen sensor 2. Refer to
EM-31, "Removal and Installation
EM-33, "Removal and Installation (bank 1)"
3.
CHECK HEATED OXYGEN SENSOR 2-I
Without CONSULT
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 4.
PBIB3458E
ECM
Condition
Voltage
Connector
+
–
Terminal
F52
57
59
Revving up to 4,000 rpm under
no load at least 10 times
The voltage should be above 0.68 V at least once during this
procedure.
The voltage should be below 0.18 V at least once during this
procedure.
58
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