display INFINITI QX56 2011 Factory Service Manual

P0603 ECM POWER SUPPLYEC-375
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Refer to
GI-40, "Intermittent Incident".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace harness or connectors.
4.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC Confirmation Procedure. See EC-374, "
DTC Logic".
Is the 1st trip DTC P0603 displayed again?
YES >> GO TO 5.
NO >> INSPECTION END
5.REPLACE ECM
Replace ECM.
>> INSPECTION END
Revision: 2010 May2011 QX56

EC-376
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P0605 ECM
P0605 ECM
DTC LogicINFOID:0000000006217875
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 PROC EDURE FOR MALFUNCTION A AND D
1. Turn ignition switch ON.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-376, "Diagnosis Procedure".
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B
1. Turn ignition switch ON and wait at least 1 second.
2. Turn ignition switch OFF, wait at least 10 seconds, and then turn it ON.
3. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-376, "Diagnosis Procedure".
NO >> GO TO 4.
4.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION C
1. Turn ignition switch ON and wait at least 1 second.
2. Turn ignition switch OFF, wait at least 10 seconds, and then turn it ON.
3. Repeat step 2 for 32 times.
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Proceed to EC-376, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217876
1.INSPECTION START
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC Confirmation Procedure. See EC-376, "
DTC Logic".
Is the 1st trip DTC P0605 displayed again?
YES >> GO TO 2.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0605 Engine control module A) ECM calculation function is malfunctioning.
ECM
B) ECM EEP-ROM system is malfunctioning.
C) ECM self shut-off function is malfunctioning.
D) ECM temperature sensor is malfunctioning.
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

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

P1089, P1092 VVEL CONTROL SHAFT POSITION SENSOR
EC-387
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P1089, P1092 VVEL CONTROL
SHAFT POSITION SENSOR
DTC LogicINFOID:0000000006217894
DTC DETECTION LOGIC
NOTE:
If DTC P1089 or P1092 is displayed with DTC P1608, first perform the trouble diagnosis for DTC P1608.
Refer to EC-453, "
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.
TESTING CONDITION:
Before performing the following procedure, confi rm that battery voltage is 10 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-387, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217895
1.VVEL CONTROL SHAFT POSITION SENSOR POWER SUPPLY CIRCUIT
1. Disconnect VVEL control shaft pos ition sensor harness connector.
2. Turn ignition switch ON.
3. Check the voltage between VVEL control shaf t position sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.DETECT MALFUNCTIONING PART
Check the following.
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P1089 VVEL POS SEN/CIRC-B1
[VVEL control shaf
t position sen-
sor (bank 1) circuit]  An excessively low voltage from the sensor
is sent to VVEL control module.
 An excessively high voltage from the sensor is sent to VVEL control module.
 Rationally incorrect voltage is sent to VVEL control module compared with the signals
from VVEL control shaft position sensor 1
and VVEL control shaft position sensor 2.  Harness or connectors
(VVEL control shaft position sen-
sor circuit is open or shorted.)
 VVEL control shaft position sen- sor
 VVEL control module
P1092 VVEL POS SEN/CIRC-B2
[VVEL control shaf
t position sen-
sor (bank 2) circuit]
DTC No. VVEL control shaft position sensor
Ground Voltage (V)
Bank Connector Terminal
P1089 1 F72 3
Ground Approx. 5
6
P1092 2 F70 3
6
Revision: 2010 May2011 QX56

P1089, P1092 VVEL CONTROL SHAFT POSITION SENSOR
EC-389
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Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair or replace.
8.REPLACE VVEL CONTROL MODULE
1. Replace VVEL control module.
2. Perform additional service when replacing VVEL control module. Refer to EC-144, "
Work Procedure".
>> GO TO 9.
9.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC Confirmation Procedure. See EC-387, "
DTC Logic".
Is the DTC P1089 or P1092 displayed again?
YES >> GO TO 10.
NO >> INSPECTION END
10.REPLACE VVEL ACTUATOR LADDER ASSEMBLY
Replace VVEL actuator ladder assembly. Refer to EM-75, "
Removal and Installation".
>> INSPECTION END
Revision: 2010 May2011 QX56

EC-390
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P1090, P1093 VVEL ACTUATOR MOTOR
P1090, P1093 VVEL ACTUATOR MOTOR
DTC LogicINFOID:0000000006217896
DTC DETECTION LOGIC
NOTE:
If DTC P1090 or P1093 is displayed with DTC P1091,
first perform the trouble diagnosis for DTC P1091.
Refer to EC-393, "
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.
TESTING CONDITION:
Before performing the following procedure, confi rm that battery voltage is 10 V or more at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 10 second.
2. Keep the engine speed at approximately 3,500 rpm for at least 10 seconds under no load.
3. Check DTC.
Is DTC detected?
YES >> Go to EC-390, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006217897
1.VVEL ACTUATOR MOTOR ASSEMBLY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect VVEL control module harness connector.
2. Disconnect VVEL actuator motor assembly harness connector.
3. Check the continuity between VVEL control modul e harness connector and VVEL actuator motor assem-
bly harness connector.
DTC No. Trouble diagnosis name
(Trouble diagnosis content) DTC detecting condition Possible cause
P1090 VVEL ACTR MOT-B1
[VVEL system performance
(bank 1)]
 Event angle difference between the
actual and the target is detected.
 Abnormal current is sent to VVEL actuator motor assembly.  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
P1093
VVEL ACTR MOT-B2
[VVEL system performance
(bank 2)]
DTC No.
VVEL control module VVEL ac
tuator motor assembly
Continuity
Bank Connector Terminal Connector Terminal
P1090 1 F5612
F73 1Existed
2 Not existed
25 1 Not existed
2Existed
P1093 2 2
F71 1Existed
2 Not existed
15 1 Not existed
2Existed
Revision: 2010 May2011 QX56

P1090, P1093 VVEL ACTUATOR MOTOREC-391
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4. Also check harness for short to ground and power.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.DETECT MALFUNCTIONING PART
Check the following.
 Harness for open or short between VVEL actuat or motor assembly and VVEL control module
 Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK VVEL ACTUATOR MOTOR ASSEMBLY
Refer to EC-392, "
Component Inspection (VVEL ACTUATOR MOTOR ASSEMBLY)".
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
4.REPLACE VVEL ACTUATOR MOTOR ASSEMBLY
Replace VVEL actuator motor assembly. Refer to EM-75, "
Removal and Installation".
>> INSPECTION END
5.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace.
6.REPLACE VVEL CONTROL MODULE
1. Replace VVEL control module.
2. Perform additional service when replacing VVEL control module. Refer to EC-144, "
Work Procedure".
>> GO TO 7.
7.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC Confirmation Procedure. See EC-390, "
DTC Logic".
Is the DTC P1090 or P1093 displayed again?
YES >> GO TO 8.
NO >> INSPECTION END
8.CHECK VVEL ACTUATOR HOUSING ASSEMBLY
Refer to EC-392, "
Component Inspection (VVEL ACTUATOR MOTOR ASSEMBLY)".
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 9.
9.REPLACE VVEL ACTUATOR HOUSING ASSEMBLY
Replace VVEL actuator housing assembly. Refer to EM-75, "
Removal and Installation".
>> INSPECTION END
10.CHECK VVEL LADDER ASSEMBLY
Refer to EM-77, "
Inspection".
Revision: 2010 May2011 QX56