Infiniti QX56 (Z62). Manual — part 568
EC-250
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0138, P0158 HO2S2
1.
PRECONDITIONING
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
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 2 minutes.
7.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO-1
>> With CONSULT-III: GO TO 3.
NO-2
>> With GST: GO TO 5.
3.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B
WITH CONSULT-III
NOTE:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30
°
C (32 to 86
°
F).
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.
Select “DATA MONITOR” mode with CONSULT-III.
8.
Check that “COOLAN TEMP/S” indicates more than 70
°
C (158
°
F).
If not, warm up engine and go to next step when “COOLAN TEMP/S” indication reaches 70
°
C (158
°
F).
9.
Open engine hood.
10. Select “HO2S2 (B1) P1146” (for DTC P0138) or “HO2S2 (B2) P1166” (for DTC P0158) of “HO2S2” in
“DTC WORK SUPPORT” mode with CONSULT-III.
11. Follow the instruction of CONSULT-III display.
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.
12. Touch “SELF-DIAG RESULTS”.
Which is displayed on CONSULT-III screen?
OK
>> INSPECTION END
NG
>> Go to
CON NOT BE DIAGNOSED>>GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B AGAIN
1.
Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
2.
Perform DTC confirmation procedure again.
>> GO TO 3.
5.
PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B
WITH GST
Perform component function check. Refer to
EC-251, "Component Function Check"
NOTE:
Use component function check to check the overall function of the heated oxygen sensor 2 circuit. During this
check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
P0138, P0158 HO2S2
EC-251
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
YES
>> INSPECTION END
NO
>> Go to
Component Function Check
INFOID:0000000006217818
1.
PERFORM COMPONENT FUNCTION CHECK-I
WITH GST
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-II
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-III
Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000006217819
1.
INSPECTION START
Confirm the detected malfunction (A or B). Refer to
.
DTC
ECM
Condition
Voltage
Connector
+
–
Terminal
Terminal
P0138
F110
96
100
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
87
DTC
ECM
Condition
Voltage
Connector
+
–
Terminal
Terminal
P0138
F110
96
100
Keeping engine at idle for 10 minutes
The voltage should be below 0.18 V at
least once during this procedure.
P0158
87
DTC
ECM
Condition
Voltage
Connector
+
–
Terminal
Terminal
P0138
F110
96
100
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
87
EC-252
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0138, P0158 HO2S2
Which malfunction is detected?
A
>> GO TO 2
B
>> GO TO 8.
2.
CHECK HEATED OXYGEN SENSOR 2 CONNECTOR
1.
Disconnect heated oxygen sensor 2 (HO2S2) 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 FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Check the continuity between HO2S2 harness connector and ECM harness connector.
3.
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 FOR OPEN AND SHORT
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
EC-254, "Component Inspection (HO2 sensor 2)"
.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 6.
6.
REPLACE HEATED OXYGEN SENSOR 2
Replace malfunctioning heated oxygen sensor 2. Refer to
CAUTION:
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F87
1
F110
100
Existed
P0158
2
F88
1
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F87
4
F110
96
Existed
P0158
2
F88
4
87
DTC
HO2S2
ECM
Ground
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F87
4
F110
96
Ground
Not existed
P0158
2
F88
4
87
P0138, P0158 HO2S2
EC-253
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).
>> INSPECTION END
7.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
.
>> INSPECTION END
8.
CLEAR THE 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 9.
9.
CHECK HEATED OXYGEN SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect heated oxygen sensor 2 (HO2S2) 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 10.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
10.
CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
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 11.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F87
1
F110
100
Existed
P0158
2
F88
1
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F87
4
F110
96
Existed
P0158
2
F88
4
87
DTC
HO2S2
ECM
Ground
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F87
4
F110
96
Ground
Not existed
P0158
2
F88
4
87
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