INFINITI QX56 2011 Factory Service Manual

P0605 ECMEC-377
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NO >> INSPECTION END
2.REPLACE ECM
Replace ECM. Refer to EC-535, "
Removal and Installation".
>> INSPECTION END
Revision: 2010 May2011 QX56

EC-378
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P0607 ECM
P0607 ECM
DTC LogicINFOID:0000000006217877
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Check DTC.
Is DTC detected?
YES >> Go to EC-378, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217878
1.INSPECTION START
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC Confirmation Procedure. See EC-378, "
DTC Logic".
4. Check DTC.
Is the DTC P0607 displayed again?
YES >> Replace ECM. Refer to EC-535, "Removal and Installation".
NO >> INSPECTION END
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P0607 ECM
(CAN communication bus) When detecting error during the initial diagnosis
of CAN controller of ECM.
ECM
Revision: 2010 May2011 QX56

P0611 ECM PROTECTIONEC-379
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P0611 ECM PROTECTION
DescriptionINFOID:0000000006288344
This DTC is detected when the ECM protective functi
on is activated due to an extreme temperature increase
in ECM, resulting from severe conditions such as heavy load driving.
DTC LogicINFOID:0000000006288345
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
This DTC is displayed as protection function history. If no malfunction is detected after the diagnosis, the cus-
tomer must be informed of the activation of the protection function.
>> Proceed to EC-379, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006288346
1.INSPECTION START
1. Perform DTC confirmation procedure. Refer to EC-379, "
DTC Logic".
2. Check 1st trip DTC.
Is DTC P0605 detected?
YES >> Proceed to EC-376, "Diagnosis Procedure".
NO >> Explain the customer about the ac tivation of the protection function.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0611 ECM PROTECTION ECM overheat protection control is activated. ECM overheated
Revision: 2010 May2011 QX56

EC-380
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P062B ECM
P062B ECM
DescriptionINFOID:0000000006217879
This DTC is detected when the ECM-integrated injector dr
iver unit has a malfunction. For injector driver unit,
refer to EC-23, "
ECM".
DTC LogicINFOID:0000000006217880
DTC DETECTION 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.
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
1. Start the engine and keep the engine speed at idle for 30 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-380, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217881
1.CHECK FUEL INJECTOR
Perform fuel injector. Refer to EC-498, "
Component Function Check".
Is inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC cfirmation procedure again. Refer to EC-380, "
DTC Logic".
4. Check 1st trip DTC.
Is the DTC P062B displayed again?
YES >> Replace ECM. Refer to EC-535, "Removal and Installation".
NO >> INSPECTION END
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P062B Internal control module fuel injector
control performance Injector driver unit is malfunctioning.  Harness and connectors
(Injector circuit is open or
shorted)
 Battery power supply
 ECM (injector driver unit)
Revision: 2010 May2011 QX56

P0643 SENSOR POWER SUPPLYEC-381
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P0643 SENSOR POWER SUPPLY
DTC LogicINFOID:0000000006217882
DTC DETECTION 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.
TESTING CONDITION:
Before performing the following procedure, confi rm that battery voltage is 8 V or more at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 1 second.
2. Check DTC.
Is DTC detected?
YES >> Go to EC-381, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217883
1.CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between APP sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 2.
2.CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals.
DTC No.Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P0643 SENSOR POWER/CIRC
(Sensor power su
pply circuit
short) ECM detects that the voltage of
power source for sensor is ex-
cessively low or high.  Harness or connectors
(Accelerator pedal position sensor 1 circuit is shorted.)
[Camshaft position sensor (bank 2) circuit is shorted.]
[Manifold absolute pressure (MAP) sensor circuit is
shorted.]
(Throttle position sensor circuit is shorted.)
 Accelerator pedal position sensor 1
 Camshaft position sensor (bank 2)
 Manifold absolute pressure (MAP) sensor
 Throttle position sensor
APP sensor Ground Voltage (V)
Connector Terminal
E110 (Without ICC) 2 Ground Approx. 5
E67 (With ICC) 12
Revision: 2010 May2011 QX56

EC-382
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P0643 SENSOR POWER SUPPLY
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair short to ground or short to power in harness or connectors.
3.CHECK COMPONENTS
Check the following.
 Camshaft position sensor (bank 2) (Refer to EC-306, "
Component Inspection (Camshaft Position Sensor)".)
 Manifold absolute pressure (MAP) sensor (Refer to EC-208, "
Component Inspection (MAP Sensor)".)
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace malfunctioning component.
4.CHECK THROTTLE POSITION SENSOR
Refer to EC-220, "
Component Inspection (Throttle Position Sensor)".
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 5.
5.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
Replace electric throttle control actuator. Refer to EM-30, "
Removal and Installation".
>> INSPECTION END
6.CHECK ACCELERATOR PEDAL POSITION SENSOR
Refer to EC-470, "
Component Inspection (Accelerator Pedal Position Sensor)".
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 7.
7.REPLACE ACCELERATOR PEDAL ASSEMBLY
Replace accelerator pedal assembly. Refer to ACC-3, "
MODELS WITHOUT DISTANCE CONTROL ASSIST
SYSTEM : Removal and Installation" (Without distance control assist system) or ACC-4, "MODELS WITH
DISTANCE CONTROL ASSIST SYSTEM : Removal and Installation" (With distance control assist system).
>> INSPECTION END
8.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
ECM Sensor
Connector Terminal Name Connector Terminal
F 111 81 Electric throttle control actuator F66 2
83 Camshaft position sensor (bank 2) F83 1
85 Manifold absolute pressure (MAP) sensor F65 1
E80 137 APP sensor 1 (Without ICC) E110 2
137 APP sensor 1 (With ICC) E67 12
Revision: 2010 May2011 QX56

P0850 PNP SWITCHEC-383
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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-384
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P0850 PNP SWITCH
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to
EC-384, "Diagnosis Procedure".
NO >> INSPECTION END
5.PERFORM COMPONENT FUNCTION CHECK
WITH GST
Perform Component Function Check. Refer to EC-384, "
Component Function Check".
NOTE:
Use Component Function Check to check the overall func tion of the park/neutral position (PNP) signal circuit.
During this check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-384, "
Diagnosis Procedure".
Component Function CheckINFOID:0000000006217886
1.PERFORM COMPONENT FUNCTION CHECK
WITH GST
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-384, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006217887
1.CHECK DTC WITH TCM
Refer to TM-61, "
CONSULT-III Function (TRANSMISSION)".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace malfunctioning part.
2.CHECK STARTING SYSTEM
Turn ignition switch OFF, then turn it to START.
Does starter motor operate?
YES >> GO TO 3.
NO >> Check DTC with BCM. Refer to BCS-57, "
DTCIndex".
3.CHECK PNP SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect A/T assembly harness connector.
3. Disconnect ECM harness connector.
4. Check the continuity between A/T assembly harness connector and ECM harness connector.
VHCL SPEED SE More than 64 km/h (40 mph)
Selector lever Suitable position
ECM
Condition Voltage (V)
Connector +–
Te r m i n a l Te r m i n a l
F111 11 175 Selector lever P or N position Battery voltage
Except above position Approx. 0
Revision: 2010 May2011 QX56

P0850 PNP SWITCHEC-385
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5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
 Harness for open or short between A/T assembly and ECM
 Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
A/T assembly ECM Continuity
Connector Terminal Connector Terminal
F 3 0 1 9 F 111 11 E x i s t e d
Revision: 2010 May2011 QX56

EC-386
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P1087, P1088 VVEL SYSTEM
P1087, P1088 VVEL SYSTEM
DTC LogicINFOID:0000000006217892
DTC DETECTION LOGIC
NOTE:
If DTC P1087 or P1088 is disp
layed with DTC P1090 or P1093.
Perform the trouble diagnosis for DTC P1090 or P1093. Refer to EC-390, "
DTC Logic".
Diagnosis ProcedureINFOID:0000000006217893
If DTC P1087 or P1088 is displayed with DTC P1090 or P1093.
Perform the trouble diagnosis for DTC P1090 or P1093. Refer to EC-390, "
DTC Logic".
DTC No.Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P1087 VVEL SYSTEM-B1
[VVEL small event angle malfunction
(bank 1)]
The event angle of VVEL control
shaft is always small. Harness or connectors
(VVEL actuator motor assembly
circuit is open or shorted.)
 VVEL actuator motor assembly
 VVEL actuator housing assembly
 VVEL ladder assembly
 VVEL control module
P1088
VVEL SYSTEM-B2
[VVEL small event angle malfunction
(bank 2)]
Revision: 2010 May2011 QX56