Infiniti QX56 (Z62). Manual — part 566
EC-242
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0133, P0153 A/F SENSOR 1
• Before installing new A/F 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
P0137, P0157 HO2S2
EC-243
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
P0137, P0157 HO2S2
DTC Logic
INFOID:0000000006217813
DTC DETECTION LOGIC
The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the air fuel ratio (A/F) sensor 1. The oxy-
gen storage capacity of the three way catalyst (manifold) causes the
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether the maximum voltage of the sensor
is sufficiently high during various driving conditions such as fuel cut.
DTC CONFIRMATION PROCEDURE
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.
Will CONSULT-III be used?
YES
>> GO TO 2.
NO
>> GO TO 4.
2.
PERFORM DTC CONFIRMATION PROCEDURE
WITH CONSULT-III
TESTING CONDITION:
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.
Restart 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) P1147” (for DTC P0137) or “HO2S2 (B2) P1167” (for DTC P0157) 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”.
JMBIA1572GB
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0137
HO2S2 (B1)
[Heated oxygen sensor 2
(bank 1) circuit low voltage]
The maximum voltage from the sensor does
not reach the specified voltage.
• Harness or connectors
(The heated oxygen sensor 2 circuit is
open or shorted)
• Heated oxygen sensor 2
• Fuel pressure
• Fuel injector
• Intake air leaks
P0157
HO2S2 (B2)
[Heated oxygen sensor 2
(bank 2) circuit low voltage]
EC-244
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0137, P0157 HO2S2
Which is displayed on CONSULT-III screen?
OK
>> INSPECTION END
NG
>> Go to
CAN NOT BE DIAGNOSED>>GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE 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 2.
4.
PERFORM COMPONENT FUNCTION CHECK
WITH GST
Perform component function check. Refer to
EC-244, "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?
YES
>> INSPECTION END
NO
>> Go to
Component Function Check
INFOID:0000000006217814
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.
Restart 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.
DTC
ECM
Condition
Voltage
Connector
+
–
Terminal
Terminal
P0137
F110
96
100
Revving up to 4,000 rpm under no load at
least 10 times
The voltage should be above 0.74 V at
least once during this procedure.
P0157
87
DTC
ECM
Condition
Voltage
Connector
+
–
Terminal
Terminal
P0137
F110
96
100
Keeping engine at idle for 10 minutes
The voltage should be above 0.74 V at
least once during this procedure.
P0157
87
P0137, P0157 HO2S2
EC-245
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
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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:0000000006217815
1.
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 P0171 or P0174 detected? Is it difficult to start engine?
YES
>> Perform trouble diagnosis for DTC P0171 or P0174. Refer to
.
NO
>> GO TO 2.
2.
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 3.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
3.
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.
DTC
ECM
Condition
Voltage
Connector
+
–
Terminal
Terminal
P0137
F110
96
100
Coasting from 80 km/h (50 MPH) with se-
lector lever in the D position
The voltage should be above 0.74 V at
least once during this procedure.
P0157
87
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0137
1
F87
1
F110
100
Existed
P0157
2
F88
1
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0137
1
F87
4
F110
96
Existed
P0157
2
F88
4
87
DTC
HO2S2
ECM
Ground
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0137
1
F87
4
F110
96
Ground
Not existed
P0157
2
F88
4
87
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