2007 INFINITI QX56 Factory Service Manual

catalytic converter four wheel drive display maintenance schedule height fuses

Page 1353 of 3061

INFINITI QX56 2007 Factory Service Manual EC-270
< SERVICE INFORMATION >
DTC P0138, P0158 HO2S2
DTC P0138, P0158 HO2S2
Component DescriptionINFOID:0000000003531774
The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the

Page 1354 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0138, P0158 HO2S2
EC-271
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
DTC Confirmation ProcedureINFOID:0000000003531777
Perform PROCEDURE FOR MALFUNCTION A first.
If DTC cannot be conf

DTC P0138, P0158 HO2S2
EC-271
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
DTC Confirmation ProcedureINFOID:0000000003531777
Perform PROCEDURE FOR MALFUNCTION A first.
If DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
PROCEDURE FOR MALFUNCTION A
With CONSULT-II
1. Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.
2. Start engine and warm it up to the normal operating tempera-
ture.
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 2 minutes.
6. If 1st trip DTC is detected, go to EC-276, "
Diagnosis Procedure".
With GST
Follow the procedure “With CONSULT-II” above.
PROCEDURE FOR MALFUNCTION B
With CONSULT-II
TESTING CONDITION:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30 °C (32 to 86 °F).
1. Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.
2. Start engine and warm it up to the normal operating tempera-
ture.
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. Make sure 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 to 70°C (158°F).
7. Open engine hood.
8. Select “HO2S2 (B1) P1146” (for DTC P0138) or “HO2S2 (B2) P1166” (for DTC P0158) of “HO2S2” in
“DTC WORK SUPPORT” mode with CONSULT-II.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0138
0138
(Bank 1)
Heated oxygen sensor 2
circuit high voltageA)An excessively high voltage from the sen-
sor is sent to ECM.• Harness or connectors
(The sensor circuit is open or shorted)
• Heated oxygen sensor 2
P0158
0158
(Bank 2)B)The minimum voltage from the sensor is
not reached to the specified voltage.• Harness or connectors
(The sensor circuit is open or shorted)
• Heated oxygen sensor 2
• Fuel pressure
• Fuel injector
SEF174Y
SEF174Y

Page 1355 of 3061

INFINITI QX56 2007 Factory Service Manual EC-272
< SERVICE INFORMATION >
DTC P0138, P0158 HO2S2
9. Start engine and following the instruction of CONSULT-II.
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.
10. Make su

Page 1356 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0138, P0158 HO2S2
EC-273
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
Wiring DiagramINFOID:0000000003531779
BANK 1
Specification data are reference values and are measured between each

Page 1357 of 3061

INFINITI QX56 2007 Factory Service Manual EC-274
< SERVICE INFORMATION >
DTC P0138, P0158 HO2S2
TER-
MI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
6GRHeated oxygen sensor 2
heater (bank 1)[Engine is running]
• Engine speed: Below

Page 1358 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0138, P0158 HO2S2
EC-275
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
BANK 2
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not

Page 1359 of 3061

INFINITI QX56 2007 Factory Service Manual EC-276
< SERVICE INFORMATION >
DTC P0138, P0158 HO2S2
Diagnosis Procedure
INFOID:0000000003531780
PROCEDURE FOR MALFUNCTION A
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and reti

Page 1360 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0138, P0158 HO2S2
EC-277
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
1. Disconnect heated oxygen sensor 2 harness connector.
2. Disconnect ECM harness connector.
3. Check harness cont

Load next 8 pages

Page: < prev 1-10 ... 1321-1328 1329-1336 1337-1344 1345-1352 1353-1360 1361-1368 1369-1376 1377-1384 1385-1392 ... 3064 next >

flat tire climate control roof sat nav headlights open gas tank