2011 INFINITI QX56 Factory Service Manual

maintenance schedule fuse chart jacking points fuse diagram brake fluid tire size

Page 2425 of 5598

INFINITI QX56 2011 Factory Service Manual
P1217 ENGINE OVER TEMPERATUREEC-401
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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Check the coolant level in the reservoir tank and radiator.
Allow engine to cool befo
re checkin

P1217 ENGINE OVER TEMPERATUREEC-401
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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Check the coolant level in the reservoir tank and radiator.
Allow engine to cool befo
re checking coolant level.
Is the coolant level in the reservoir tank and/or radiator below the
proper range?
YES >> Proceed to EC-401, "Diagnosis Procedure".
NO >> GO TO 2.
2.PERFORM COMPONENT FUNCTION CHECK-II
Confirm whether customer filled the coolant or not.
Did customer fill the coolant?
YES >> Proceed to EC-401, "Diagnosis Procedure".
NO >> GO TO 3.
3.PERFORM COMPONENT FUNCTION CHECK-III
WITH CONSULT-III
1. Start the engine.
2. Perform “FAN DUTY CONTROL” in “ACTIVE TEST” mode with CONSULT-III.
3. Check that cooling fan speed varies according to the percentage. NOTE:
Fan speed changes as the percentage changes.
WITHOUT CONSULT-III
1. Start the engine.
2. Perform IPDM E/R auto active test. Refer to PCS-10, "
Diagnosis Description".
3. Check that cooling fan speed increase. NOTE:
Speed changes gradually when performing the auto active test.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Proceed to EC-401, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006217911
1.CHECK COOLING FAN OPERATION
WITH CONSULT-III
1. Start the engine.
2. Perform “FAN DUTY CONTROL” in “ACTIVE TEST” mode with CONSULT-III.
3. Check that cooling fan speed varies according to the percentage. NOTE:
Speed changes gradually as the percentage changes.
WITHOUT CONSULT-III
1. Stert the engine.
2. Perform IPDM E/R auto active test and check cooling fan operation, refer to PCS-10, "
Diagnosis Descrip-
tion".
3. Check that cooling fan speed increase.
NOTE:
Speed changes gradually when performing the auto active test.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Proceed to EC-495, "
Diagnosis Procedure".
2.CHECK ENGINE COOLANT LEAKAGE-I
Check cooling system for leakage. Refer to CO-8, "
Inspection".
Is leakage detected?
SEF621W
Revision: 2010 May2011 QX56

Page 2426 of 5598

INFINITI QX56 2011 Factory Service Manual
EC-402
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1217 ENGINE OVER TEMPERATURE
YES >> GO TO 3.
NO >> GO TO 4.
3.CHECK ENGINE COOLANT LEAKAGE-II
Check the following for leakage.
Hose
Radiator
Water pump

Page 2427 of 5598

INFINITI QX56 2011 Factory Service Manual
P1220 FUEL PUMP CONTROL MODULE (FPCM)
EC-403
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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P1220 FUEL PUMP CONTROL MODULE (FPCM)
DTC LogicINFOID:0000000006217912
DTC DETECTION LO

Page 2428 of 5598

INFINITI QX56 2011 Factory Service Manual
EC-404
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1220 FUEL PUMP CONTROL MODULE (FPCM)
3.CHECK FPCM GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check the continuity between FPCM harness

Page 2429 of 5598

INFINITI QX56 2011 Factory Service Manual
P1220 FUEL PUMP CONTROL MODULE (FPCM)
EC-405
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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8.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION

Page 2430 of 5598

INFINITI QX56 2011 Factory Service Manual
EC-406
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1225 TP SENSOR
P1225 TP SENSOR
DTC LogicINFOID:0000000006217915
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
1. Turn ignition switch OFF

Page 2431 of 5598

INFINITI QX56 2011 Factory Service Manual
P1226 TP SENSOREC-407
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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P1226 TP SENSOR
DTC LogicINFOID:0000000006217917
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITION

Page 2432 of 5598

INFINITI QX56 2011 Factory Service Manual
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

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

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