2011 INFINITI QX56 ECO mode

EC-364
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0524 ENGINE OIL PRESSURE
P0524 ENGINE OIL PRESSURE
DTC LogicINFOID:0000000006288342
DTC DETECTION LOGIC
NOTE:
If DTC P0524 is displayed with DTC P0075 or P0081,
perform trouble diagnosis for DTC P0075 or P0081
first. Refer to EC-193, "
DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING-I
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, confi rm that battery voltage is between 10 V and 16 V at
idle.
>> GO TO 2.
2.PRECONDITIONING-II
Check oil level and oil pressure. Refer to LU-7, "
Inspection".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Proceed to LU-7, "
Inspection".
3.PERFORM DTC CONFIRMATION PROCEDURE
WITH CONSULT-III
1. Select “DATA MONITOR” mode with CONSULT-III.
2. Maintain the following conditions for at least 20 consecutive seconds.
CAUTION:
Always drive at a safe speed.
3. Check 1st trip DTC.
WITH GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES >> Proceed to EC-365, "Diagnosis Procedure"
DTC No.Trouble diagnosis name
(Trouble diagnosis content) Detecting condition Possible cause
P0524 ENGINE OIL PRESSURE
(Engine oil pressure too low) Engine oil pressure is low because
there is a gap between angle of target
and phase-control angle.  Engine oil pressure or level too low
 Crankshaft position sensor
 Camshaft position sensor
 Intake valve timing control solenoid valve
 Accumulation of debris to the signal pick-up por-
tion of the camshaft
 Timing chain installation
 Foreign matter caught in the oil groove for intake valve timing control
ENG SPEED More than 1,700 rpm
COOLAN TEMP/S More than 70 °C (158 °F)
Selector lever 1st or 2nd position
Driving location uphill Driving vehicle uphill
(Increased engine load will help maintain the driving
conditions required for this test.)
Revision: 2010 May2011 QX56

P0850 PNP SWITCHEC-383
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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P0850 PNP SWITCH
DescriptionINFOID:0000000006217884
When the selector lever position is P or N, park/neut
ral position (PNP) signal is sent to ECM from TCM.
DTC LogicINFOID:0000000006217885
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.INSPECTION START
Will CONSULT-III be used?
Will CONSULT-III be used?
YES >> GO TO 2.
NO >> GO TO 5.
2.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 3.
3.CHECK PNP SIGNAL
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select “P/N POSI SW” in “DATA MONITOR” mode wit h CONSULT-III. Then check the “P/N POSI SW” sig-
nal under the following conditions.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Go to EC-384, "
Diagnosis Procedure".
4.PERFORM DTC CONFIRMATION PROCEDURE
1. Select “DATA MONITOR” mode with CONSULT-III.
2. Start engine and warm it up to normal operating temperature.
3. Maintain the following conditions for at least 50 consecutive seconds. CAUTION:
Always drive vehicle at a safe speed.
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P0850 P-N POS SW/CIRCUIT
(Park/neutral position
switch) The signal of the park/neutral position (PNP)
signal does not change during driving after the
engine is started.  Harness or connectors
[The park/neutral position (PNP) signal
circuit is open or shorted.]
TCM
Position (Selector lever) Known-good signal
N or P position ON
Except above position OFF
ENG SPEED 1,300 - 6,375 rpm
COOLAN TEMP/S More than 70 °C (158 °F)
B/FUEL SCHDL 2.0 - 31.8 msec
Revision: 2010 May2011 QX56

EC-408
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1421 COLD START CONTROL
P1421 COLD START CONTROL
DescriptionINFOID:0000000006288263
ECM controls ignition timing and engine idle speed when engine is started with prewarming up condition.
This control promotes the activation of three way ca
talyst by heating the catalyst and reduces emissions.
DTC LogicINFOID:0000000006288264
DTC DETECTION LOGIC
NOTE:
If DTC P1421 is displayed with other DTC, firs t perform the trouble diagnosis for other DTC.
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 more than 11 V at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Select “DATA MONITOR” mode with CONSULT-III.
4. Check the indication of “COOLAN TEMP/S”. If it is between 7 °C (45 °F) and 36 °C (97 °F), go to the following steps.
If it is below 7 °C (45 °F), warm engine up to more than 7 °C (45 °F) and retry from step 1.
If it is above 36 °C (97 °F), cool engine down to less than 36 °C (97 °F) and retry from step 1.
5. Start engine and let it idle for 5 minutes.
6. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-408, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006288265
1.PERFORM IDLE AIR VOLUME LEARNING
Perform EC-148, "
Work Procedure".
Is Idle Air Volume Learning carried out successfully?
YES >> GO TO 2.
NO >> Follow the instruction of Idle Air Volume Learning.
2.CHECK INTAKE SYSTEM
Check for the cause of intake air volume lacking. Refer to the following.
 Crushed intake air passage
 Intake air passage clogging
Is the inspection result normal?
YES >> GO TO 3.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1421 Cold start emission reduction
strategy monitoring ECM does not control ignition timing and engine
idle speed properly when engine is started with
prewarming up condition.  Lack of intake air volume
 Fuel injection system
ECM
Revision: 2010 May2011 QX56

EC-410
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1423, P1424 COLD
START CONTROL
P1423, P1424 COLD START CONTROL
DescriptionINFOID:0000000006288266
ECM controls fuel injection timing and fuel injection quantity when engine is started with the engine cold.
This control promotes the activation of three way ca talyst by heating the catalyst and reduces emissions.
DTC LogicINFOID:0000000006288267
DTC DETECTION LOGIC
NOTE:
If DTC P1423 or P1424 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
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.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
WITH CONSULT-III
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Select “DATA MONITOR” mode with CONSULT-III.
4. Check that “COOLAN TEMP/S”.
- If it is between 5 °C (41 °F) and 40 °C (104 °F) go to the following steps.
- If it is below 5 °C (41 °F) warm engine up to more than 5 °C (41 °F) and retry from step 1.
- If it is above 40 °C (104 °F) cool engine down to less than 40 °C (104 °F) and retry from step 1.
5. Start engine and let it idle for 5 minutes.
6. Check 1st trip DTC.
WITH GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES >> Proceed to EC-410, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006288268
1.INSPECTION START
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC confirmation procedure. Refer to EC-410, "
DTC Logic".
4. Check 1st trip DTC.
Is the 1st trip DTC P1423 or P1424 displayed again?
YES >> GO TO 2.
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P1423 COLD START CONTROL
(Cold start emission reduction
strategy monitoring) ECM does not control fuel injection timing prop-
erly when engine is started with the engine cold.
ECM
P1424 COLD START CONTROL
(Cold start emission reduction
strategy monitoring) ECM does not control fuel injection quantity
properly when engine is started with with the en-
gine cold.
Revision: 2010 May2011 QX56

EC-424
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1554 BATTERY CURRENT SENSOR
P1554 BATTERY CURRENT SENSOR
DTC LogicINFOID:0000000006217928
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM COMPONENT FUNCTION CHECK
Perform Component Function Check. Refer to EC-424, "
Component Function Check".
NOTE:
Use Component Function Check to check the overall functi on of the battery current sensor circuit. During this
check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-425, "
Diagnosis Procedure".
Component Function CheckINFOID:0000000006217929
1.PRECONDITIONING
TESTING CONDITION:
 Before performing the following procedure, confirm that battery voltage is 12.8 V or more at idle.
 Before performing the following procedure, confi rm that all load switches and A/C switch are turned
OFF.
>> GO TO 2.
2.PERFORM COMPONENT FUNCTION CHECK
WITH CONSULT-III
1. Start engine and let it idle.
2. Select “BAT CUR SEN” in “DATA MONITOR” mode with CONSULT-III.
3. Check “BAT CUR SEN” indication for 10 seconds. “BAT CUR SEN” should be above 2,300 mV at least once.
WITHOUT CONSULT-III
1. Start engine and let it idle.
2. Check the voltage between ECM harness connector terminals as per the following.
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P1554 BAT CURRENT SENSOR
(Battery current
sensor per-
formance) The output voltage of the bat-
tery current sensor is lower than
the specified value while the
battery voltage is high enough.  Harness or connectors
(Battery current sensor circuit is open or shorted.)
(Accelerator pedal position sensor 2 circuit is shorted.)
[Camshaft position sensor (bank 1) circuit is shorted.]
(Crankshaft position sensor circuit is shorted.)
(Refrigerant pressure sensor circuit is shorted.)
(EVAP control system pressure sensor circuit is short-
ed.)
 Battery current sensor
 Accelerator pedal position sensor
 Camshaft position sensor (bank 1)
 Crankshaft position sensor
 Refrigerant pressure sensor
 EVAP control system pressure sensor
Revision: 2010 May2011 QX56

P1564 ASCD STEERING SWITCHEC-431
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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P1564 ASCD STEERING SWITCH
DTC LogicINFOID:0000000006217935
DTC DETECTION LOGIC
NOTE:
If DTC P1564 is displayed with DTC P0605, first pe
rform the trouble diagnosis for DTC P0605. Refer to
EC-376, "
DTC Logic".
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.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 10 seconds.
2. Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds.
3. Press CANCEL switch for at least 10 seconds, then release it and wait at least 10 seconds.
4. Press RESUME/ACCELERATE switch for at least 10 seconds, then release it and wait at least 10 sec-
onds.
5. Press SET/COAST switch for at least 10 seconds , then release it and wait at least 10 seconds.
6. Check DTC.
Is DTC detected?
YES >> Go to EC-431, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217936
1.CHECK ASCD STEERING SWITCH CIRCUIT
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select “MAIN SW”, “CANCEL SW”, “RESUME/ACC SW” and “SET SW” in “DATA MONITOR” mode with
CONSULT-III.
3. Check each item indication under the following conditions.
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P1564 ASCD SW
(ASCD steering switch)  An excessively high voltage signal from the
ASCD steering switch is sent to ECM.
 ECM detects that input signal from the ASCD steering switch is out of the specified
range.
 ECM detects that the ASCD steering switch is stuck ON.  Harness or connectors
(The switch circuit is open or shorted.)
 ASCD steering switch
ECM
Monitor item Condition Indication
MAIN SW MAIN switch Pressed ON
Released OFF
CANCEL SW CANCEL switch Pressed ON
Released OFF
RESUME/ACC SW RESUME/ACCELERATE
switch Pressed ON
Released OFF
Revision: 2010 May2011 QX56

P1572 ASCD BRAKE SWITCHEC-439
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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Always drive vehicle at a safe speed.
NOTE:
This procedure may be conducted with the drive wheel
s lifted in the shop or by driving the vehicle.
If a road test is expected to be easier , it is unnecessary to lift the vehicle.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-439, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217944
1.CHECK OVERALL FUNCTION-I
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT-III.
3. Check “BRAKE SW1” indication under the following conditions.
WITHOUT CONSULT-III
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector terminals as per the following.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 3.
2.CHECK OVERALL FUNCTION-II
WITH CONSULT-III
Select “BRAKE SW2” and check indication under the following conditions.
WITHOUT CONSULT-III
Check the voltage between ECM harness connector terminals under the following conditions.
Vehicle speed More than 30 km/h (19 mph)
Selector lever Suitable position
Driving location Depress the brake pedal for more than 5 seconds so as
not to come off from the above-mentioned vehicle speed.
Monitor item Condition Indication
BRAKE SW1
(ASCD brake switch) Brake pedalSlightly depressed OFF
Fully released ON
ECM Condition Voltage (V)
Connector +–
Terminal Terminal
E80 147
(ASCD brake switch signal) 175 Brake pedalSlightly depressed Approx. 0
Fully released Battery voltage
Monitor item Condition Indication
BRAKE SW2
(Stop lamp switch) Brake pedalSlightly depressed ON
Fully released OFF
Revision: 2010 May2011 QX56

EC-444
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1572 ICC BRAKE SWITCH
Always drive vehicle at a safe speed.
NOTE:
This procedure may be conducted with the drive wheel
s lifted in the shop or by driving the vehicle.
If a road test is expected to be easier , it is unnecessary to lift the vehicle.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-444, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217948
1.CHECK DTC WITH ADAS CONTROL UNIT
Refer to DAS-21, "
CONSULT-III Function (ICC/ADAS)" and DAS-38, "DTC Index".
Are any DTCs detected?
YES >> Perform the Diagnosis Procedure corresponding to the detected DTC.
NO >> GO TO 2.
2.CHECK OVERALL FUNCTION-I
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select “BRAKE SW1” in “DAT A MONITOR” mode with CONSULT-III.
3. Check “BRAKE SW1” indication under the following conditions.
WITHOUT CONSULT-III
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 3.
3.CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Disconnect ICC brake switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between ICC brake switch harness connector and ground.
Vehicle speed More than 30 km/h (19 mph)
Selector lever Suitable position
Driving location Depress the brake pedal for more than 5 seconds so as
not to come off from the above-mentioned vehicle speed.
Monitor item Condition Indication
BRAKE SW1
(ICC brake switch) Brake pedalSlightly depressed OFF
Fully released ON
ECM Condition Voltage (V)
Connector +–
Te r m i n a l Te r m i n a l
E80 147
(ICC brake switch signal) 175 Brake pedalSlightly depressed Approx. 0
Fully released Battery voltage
ICC brake switch
Ground Voltage
Connector Terminal
E68 1 Ground Battery voltage
Revision: 2010 May2011 QX56