INFINITI QX56 2011 Factory Service Manual

P0128 THERMOSTAT FUNCTIONEC-227
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Diagnosis ProcedureINFOID:0000000006288287
1.CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to EC-227, "
Component Inspection (Engine Coolant Temperature Sensor)".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace engine coolant temperature sensor.
2.CHECK THERMOSTAT
Remove and Check the thermostat. Refer to CO-20, "
Removal and Installation" and CO-21, "Inspection".
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace thermostat.
Component Inspection (Engine Coolant Temperature Sensor)INFOID:0000000006288288
1.CHECK ENGINE COOLANT TEMPERATURE SENSOR
1. Turn ignition switch OFF.
2. Disconnect engine coolant temperature sensor harness connector.
3. Remove engine coolant temperature sensor.
4. Check resistance between engine coolant temperature sensor
terminals by heating with hot water as shown in the figure.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace engine coolant temperature sensor.
Terminals Condition Resistance (k Ω)
1 and 2 Temperature [ °C ( °F)] 20 (68) 2.35 - 2.73
50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260
JMBIA0080ZZ
Revision: 2010 May2011 QX56

EC-228
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P0130, P0150 A/F SENSOR 1
P0130, P0150 A/F SENSOR 1
DTC LogicINFOID:0000000006217804
DTC DETECTION LOGIC
To judge malfunctions, the diagnosis checks that the A/
F signal computed by ECM from the A/F sensor 1 sig-
nal fluctuates according to fuel feedback control.
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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
1. Start engine and warm it up to normal operating temperature.
2. Let engine idle for 2 minutes.
3. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-230, "Diagnosis Procedure".
NO-1 >> With CONSULT-III: GO TO 3.
NO-2 >> With GST: GO TO 7.
3.CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION
WITH CONSULT-III
1. Start engine and warm it up to normal operating temperature.
2. Select “A/F SEN1 (B1)” or “A/F SEN1 (B 2)” in “DATA MONITOR” mode with CONSULT-III.
3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.
Does the indication fluctuate around 1.5 V?
YES >> GO TO 4.
NO >> Go to EC-230, "
Diagnosis Procedure".
4.PERFORM DTC CONFIRMATION PR OCEDURE FOR MALFUNCTION B-I
1. Select “A/F SEN1 (B1) P1276” (for DTC P0130) or “A/F SEN1 (B2) P1286” (for DTC P0150) of “A/F
SEN1” in “DTC WORK SUPPORT” mode with CONSULT-III.
2. Touch “START”.
3. When the following conditions are met, “T ESTING” will be displayed on the CONSULT-III screen.
DTC No.Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible Cause
P0130 A/F SENSOR1 (B1)
[Air fuel ratio (A/F) sensor 1
(bank 1) circuit] A)
The A/F signal computed by ECM from the A/F
sensor 1 signal is constantly in a range other
than approx. 1.5 V.
 Harness or connectors(The A/F sensor 1 circuit is open
or shorted.)
 A/F sensor 1
B)
The A/F signal computed by ECM from the A/F
sensor 1 signal is constantly approx. 1.5 V.
P0150 A/F SENSOR1 (B2)
[Air fuel ratio (A/F) sensor 1
(bank 2) circuit] A)
The A/F signal computed by ECM from the A/F
sensor 1 signal is constantly in a range other
than approx. 1.5 V.
B) The A/F signal computed by ECM from the A/F
sensor 1 signal is constantly approx. 1.5 V.
Revision: 2010 May2011 QX56

P0130, P0150 A/F SENSOR 1EC-229
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If “TESTING” is not displayed after 20 seconds, retry from step 2.
CAUTION:
Always drive vehicle at a safe speed.
Is
“TESTING” displayed on CONSULT-III screen?
YES >> GO TO 5.
NO >> Check A/F sensor 1 function again. GO TO 3.
5.PERFORM DTC CONFIRMATION PR OCEDURE FOR MALFUNCTION B-II
Release accelerator pedal fully.
NOTE:
Never apply brake when releasing the accelerator pedal.
Which does
“TESTING” change to?
COMPLETED>>GO TO 6.
OUT OF CONDITION>>Retry DTC CO NFIRMATION PROCEDURE. GO TO 4.
6.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-III
Touch “SELF-DIAG RESULT”.
Which is displayed on CONSULT-III screen?
YES >> INSPECTION END
NO >> Go to EC-230, "
Diagnosis Procedure".
7.PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B
WITH GST
Perform component function check. Refer to EC-229, "
Component Function Check".
NOTE:
Use component function check to check the overall function of the A/F sensor 1 circuit. During this check, a
1st trip DTC might not be confirmed.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-230, "
Diagnosis Procedure".
Component Function CheckINFOID:0000000006217805
1.PERFORM COMPONENT FUNCTION CHECK
WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in the suitable gear position.
3. Shift the selector lever position to D, then rel ease the accelerator pedal fully until the vehicle speed
decreases to 50 km/h (31 MPH).
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
Never apply brake when releasing the accelerator pedal.
4. Repeat steps 2 and 3 for 5 times.
5. Stop the vehicle and turn ignition switch OFF.
6. Wait at least 10 seconds and turn ignition switch ON.
7. Turn ignition switch OFF and wait at least 10 seconds.
8. Restart engine.
9. Repeat steps 2 and 3 for 5 times.
10. Stop the vehicle.
11. Check 1st trip DTC.
ENG SPEED 1,750 - 3,200 rpm
VHCL SPEED SE More than 64 km/h (40 mph)
B/FUEL SCHDL 1.0 - 8.0 msec
Selector lever D position
Revision: 2010 May2011 QX56

EC-230
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P0130, P0150 A/F SENSOR 1
Is 1st trip DTC detected?
YES >> Go to
EC-230, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217806
1.CHECK AIR FUEL RATIO SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between A/F sensor 1 harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
2.CHECK A/F SENSOR 1 INPUT SIGN AL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector
and ground.
5. Also check harness for 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 A/F SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
4. Also check harness for short to power.
Is the inspection result normal?
DTC A/F sensor 1
Ground Voltage
Bank Connector Terminal
P0130 1 F67 4 Ground 3.0 V
P0150 2 F68 4
DTC A/F sensor 1 ECM
Continuity
Bank Connector Terminal Connector Terminal
P0130 1 F67 3 F11088
Existed
P0150 2 F68 3 78
DTC A/F sensor 1 ECM
Ground Continuity
Bank Connector Terminal Connector Terminal
P0130 1 F67 3 F11088
Ground Not existed
P0150 2 F68 3 78
DTC A/F sensor 1 ECM
Continuity
Bank Connector Terminal Connector Terminal
P0130 1 F67 6 F11094
Existed
P0150 2 F68 6 74
Revision: 2010 May2011 QX56

P0130, P0150 A/F SENSOR 1EC-231
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YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK INTERMITTENT INCIDENT
Perform GI-40, "
Intermittent Incident".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace malfunctioning part.
5.REPLACE A/F SENSOR 1
Replace malfunctioning A/F sensor 1. Refer to EM-40, "
Removal and Installation".
CAUTION:
 Discard any A/F 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 A/F senso r, 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
Revision: 2010 May2011 QX56

EC-232
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0131, P0151 A/F SENSOR 1
P0131, P0151 A/F SENSOR 1
DTC LogicINFOID:0000000006217807
DTC DETECTION LOGIC
To judge the malfunction, the diagnosis checks that t
he A/F signal computed by ECM from the A/F sensor 1
signal is not inordinately low.
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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is 10.5 V or more at idle.
>> GO TO 2.
2.CHECK A/F SENSOR FUNCTION
WITH CONSULT-III
1. Start engine and warm it up to normal operating temperature.
2. Select “A/F SEN1 (B1)” or “A/F SEN1 (B 2)” in “DATA MONITOR” mode with CONSULT-III.
3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.
WITH GST
Follow the procedure “With CONSULT-III” above.
Is the indication constantly approx. 0 V?
YES >> Go to EC-233, "Diagnosis Procedure".
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE
WITH CONSULT-III
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.
4. Restart engine.
5. Drive and accelerate vehicle to more than 40 km/h (25 MPH) within 20 seconds after restarting engine.
CAUTION:
Always drive vehicle at a safe speed.
6. Maintain the following conditions fo r approximately 20 consecutive seconds.
NOTE:
 Keep the accelerator pedal as stead y as possible during cruising.
DTC No.Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible Cause
P0131 A/F SENSOR1 (B1)
[Air fuel ratio (A/F) sensor 1
(bank 1) circuit low voltage]
 The A/F signal computed by ECM from the A/F
sensor 1 signal is constantly approx. 0 V.  Harness or connectors
(The A/F sensor 1 circuit is open or
shorted.)
 A/F sensor 1
P0151 A/F SENSOR1 (B2)
[Air fuel ratio (A/F) sensor 1
(bank 2) circuit low voltage]
ENG SPEED 1,000 - 3,200 rpm
VHCL SPEED SE More th
an 40 km/h (25 mph)
B/FUEL SCHDL 1.5 - 9.0 msec
Selector lever Suitable position
Revision: 2010 May2011 QX56

P0131, P0151 A/F SENSOR 1EC-233
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If this procedure is not completed within 1 minute after restarting engine at step 1, return to step
1.
7. Check 1st trip DTC.
WITH GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES >> Go to EC-233, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217808
1.CHECK AIR FUEL RATIO SENSO R 1 POWER SUPPLY CIRCUIT
1. Disconnect air fuel ratio (A /F) sensor 1 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between A/F sensor 1 harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
2.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector
and ground.
5. Also check harness for 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 A/F SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
DTCA/F sensor 1
Ground Voltage
Bank Connector Terminal
P0130 1 F67 4 Ground 3.0 V
P0150 2 F68 4
DTC A/F sensor 1 ECM
Continuity
Bank Connector Terminal Connector Terminal
P0130 1 F67 3 F11088
Existed
P0150 2 F68 3 78
DTC A/F sensor 1 ECM
Ground Continuity
Bank Connector Terminal Connector Terminal
P0130 1 F67 3 F11088
Ground Not existed
P0150 2 F68 3 78
Revision: 2010 May2011 QX56

EC-234
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0131, P0151 A/F SENSOR 1
4. Also check harness for 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 INTERMITTENT INCIDENT
Perform GI-40, "
Intermittent Incident".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace malfunctioning part.
5.REPLACE A/F SENSOR 1
Replace malfunctioning A/F sensor 1. Refer to EM-40, "
Removal and Installation".
CAUTION:
 Discard any A/F sensor which has b een 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 A/F sensor, clean exhau st 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
DTC A/F sensor 1 ECM
Continuity
Bank Connector Terminal Connector Terminal
P0130 1 F67 6 F11094
Existed
P0150 2 F68 6 74
Revision: 2010 May2011 QX56

P0132, P0152 A/F SENSOR 1EC-235
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P0132, P0152 A/F SENSOR 1
DTC LogicINFOID:0000000006217809
DTC DETECTION LOGIC
To judge the malfunction, the diagnosis checks that the
A/F signal computed by ECM from the A/F sensor 1
signal is not inordinately high.
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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is 10.5 V or more at idle.
>> GO TO 2.
2.CHECK A/F SENSOR FUNCTION
WITH CONSULT-III
1. Start engine and warm it up to normal operating temperature.
2. Select “A/F SEN1 (B1)” or “A/F SEN1 (B2) ” in “DATA MONITOR” mode with CONSULT-III.
3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.
WITH GST
Follow the procedure “With CONSULT-III” above.
Is the indication constantly approx. 5 V?
YES >> Go to EC-236, "Diagnosis Procedure".
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE
WITH CONSULT-III
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.
4. Restart engine.
5. Drive and accelerate vehicle to more than 40 km/h (25 MPH) within 20 seconds after restarting engine. CAUTION:
Always drive vehicle at a safe speed.
6. Maintain the following conditions for approximately 20 consecutive seconds.
NOTE:
Keep the accelerator pedal as steady as possible during cruising.
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible Cause
P0132 A/F SENSOR1 (B1)
[Air fuel ratio (A/F) sensor 1
(bank 1) circuit high voltage]
 The A/F signal computed by ECM from the
A/F sensor 1 signal is constantly approx. 5 V.  Harness or connectors
(The A/F sensor 1 circuit is open or
shorted.)
 A/F sensor 1
P0152 A/F SENSOR1 (B2)
[Air fuel ratio (A/F) sensor 1
(bank 2) circuit high voltage]
ENG SPEED 1,000 - 3,200 rpm
VHCL SPEED SE More than 40 km/h (25 mph)
B/FUEL SCHDL 1.5 - 9.0 msec
Selector lever Suitable position
Revision: 2010 May2011 QX56

EC-236
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0132, P0152 A/F SENSOR 1

If this procedure is not completed within 1 minute af ter restarting engine at step 1, return to step
1.
7. Check 1st trip DTC.
WITH GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES >> Go to EC-236, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217810
1.CHECK AIR FUEL RATIO SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect air fuel ratio (A/F) sensor 1 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between A/F sensor 1 harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
2.CHECK A/F SENSOR 1 INPUT SIGN AL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
4. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector
and ground.
5. Also check harness for 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 A/F SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
DTCA/F sensor 1
Ground Voltage
Bank Connector Terminal
P0130 1 F67 4 Ground 3.0 V
P0150 2 F68 4
DTC A/F sensor 1 ECM
Continuity
Bank Connector Terminal Connector Terminal
P0130 1 F67 3 F11088
Existed
P0150 2 F68 3 78
DTC A/F sensor 1 ECM
Ground Continuity
Bank Connector Terminal Connector Terminal
P0130 1 F67 3 F11088
Ground Not existed
P0150 2 F68 3 78
Revision: 2010 May2011 QX56