2007 INFINITI QX56 Factory Service Manual

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Page 1345 of 3061

INFINITI QX56 2007 Factory Service Manual EC-262
< SERVICE INFORMATION >
DTC P0137, P0157 HO2S2
The voltage should be above 0.58V at least once during this procedure.
8. If NG, go to EC-265, "
Diagnosis Procedure" .
Wiring DiagramINFOID:00000

Page 1346 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0137, P0157 HO2S2
EC-263
< SERVICE INFORMATION >
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Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECMs

Page 1347 of 3061

INFINITI QX56 2007 Factory Service Manual EC-264
< SERVICE INFORMATION >
DTC P0137, P0157 HO2S2
BANK 2
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when me

Page 1348 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0137, P0157 HO2S2
EC-265
< SERVICE INFORMATION >
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Diagnosis ProcedureINFOID:0000000003531771
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and r

Page 1349 of 3061

INFINITI QX56 2007 Factory Service Manual EC-266
< SERVICE INFORMATION >
DTC P0137, P0157 HO2S2
2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode
with CONSULT-II.
3. Clear the self-learning control coefficient by touching “CLEAR

Page 1350 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0137, P0157 HO2S2
EC-267
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2. Check harness continuity between the following terminals and ground.
Refer to Wiring Diagram.
3. Also check har

Page 1351 of 3061

INFINITI QX56 2007 Factory Service Manual EC-268
< SERVICE INFORMATION >
DTC P0137, P0157 HO2S2
6. Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select
“HO2S2 (B1)/(B2)” as the monitor item with CONSULT-II.
7. Check “HO2S2

EC-268
< SERVICE INFORMATION >
DTC P0137, P0157 HO2S2
6. Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select
“HO2S2 (B1)/(B2)” as the monitor item with CONSULT-II.
7. Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to ±25%.
“HO2S2 (B1)/(B2)” should be above 0.58V at least once when the “FUEL INJECTION” is +25%.
“HO2S2 (B1)/(B2)” should be below 0.18V at least once when the “FUEL INJECTION” is −25%.
CAUTION:
• 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 tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
Without CONSULT-II
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. Set voltmeter probes between ECM terminal 55 [HO2S2 (B1) signal] or 74 [HO2S2 (B2) signal] and
ground.
6. Check the voltage when revving up to 4,000 rpm under no load
at least 10 times.
(Depress and release accelerator pedal as soon as possible.)
The voltage should be above 0.58V at least once during this
procedure.
If the voltage is above 0.58V at step 6, step 7 is not neces-
sary.
7. Keep vehicle at idling for 10 minutes, then check voltage. Or
check the voltage when coasting from 80 km/h (50 MPH) in D
position.
The voltage should be below 0.18V at least once during this
procedure.
8. If NG, replace heated oxygen sensor 2.
CAUTION:
• 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 tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
PBIB1672E
PBIB2636E
PBIB2054E

Page 1352 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0137, P0157 HO2S2
EC-269
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Removal and InstallationINFOID:0000000003531773
HEATED OXYGEN SENSOR 2
Refer to EM-21 .

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