2009 INFINITI QX56 Factory Service Manual

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Page 1409 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-82
< COMPONENT DIAGNOSIS >[VK56DE]
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis ProcedureINFOID:0000000003771324
1.INSPECTION START
Start engine.
Is engine running?
Ye

Page 1410 of 4171

INFINITI QX56 2009 Factory Service Manual
POWER SUPPLY AND GROUND CIRCUITEC-83
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
OK or NG
OK >> GO TO 7.
NG >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
Harnes

Page 1411 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-84
< COMPONENT DIAGNOSIS >[VK56DE]
POWER SUPPLY AND GROUND CIRCUIT
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 13.
NG >> Repair open

Page 1412 of 4171

INFINITI QX56 2009 Factory Service Manual
POWER SUPPLY AND GROUND CIRCUITEC-85
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
Check the following.
Harness connectors F32, E2
Harness for open or short between ECM and gro

Page 1413 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-86
< COMPONENT DIAGNOSIS >[VK56DE]
U1000, U1001 CAN COMM CIRCUIT
U1000, U1001 CAN COMM CIRCUIT
DescriptionINFOID:0000000003771326
CAN (Controller Area Network) is a serial communication
line for

Page 1414 of 4171

INFINITI QX56 2009 Factory Service Manual
P0011, P0021 IVT CONTROLEC-87
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
P0011, P0021 IVT CONTROL
On Board Diagnosis LogicINFOID:0000000003771334
FAIL-SAFE MODE
When the malfunc

P0011, P0021 IVT CONTROLEC-87
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
P0011, P0021 IVT CONTROL
On Board Diagnosis LogicINFOID:0000000003771334
FAIL-SAFE MODE
When the malfunction is detected,
the ECM enters fail-safe mode.
DTC Confirmation ProcedureINFOID:0000000003771335
CAUTION:
Always drive at a safe speed.
NOTE:
If DTC P0011 or P0021 is displayed with DTC P0075, P0081, P1140 or P1145, first perform the trouble
diagnosis for EC-100
or EC-291.
If DTC Confirmation Procedure has been previously c onducted, always perform the following before con-
ducting the next step.
1. Turn ignition swich OFF and wait at least 10 seconds.
2. Turn ignition swich ON.
3. Turn ignition swich OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confi rm that battery voltage is between 10V and 16V at
idle.
PROCEDURE FOR MALFUNCTION A
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-III.
3. Maintain the following conditions for at least 10 consecutive seconds.
DTC No. Trouble diagnosis name Detecting condition Possible cause
P0011
0011
(Bank 1)
Intake valve timing control
performance A
The alignment of the intake valve timing
control has been misresistered. Harness or connectors
(Intake valve timing control solenoid
valve circuit is open or shorted.)
Harness or connectors (Intake valve timing control position
sensor circuit is open or shorted.)
Intake valve timing control solenoid valve
Intake valve timing control position sensor
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Accumulation of debris to the signal
pick-up portion of the camshaft
sprocket
Timing chain installation
Foreign matter caught in the oil groove for intake valve timing control
P0021
0021
(Bank 2)
B
There is a gap between angle of target and
phase-control angle degree.
Detected items Engine operating condition in fail-safe mode
Intake valve timing control The signal is not energized to the solenoid valve and the valve control does not function
ENG SPEED More than 2,000 rpm (A constant rotation is maintained.)
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 con-
ditions required for this test.)
Revision: December 20092009 QX56

Page 1415 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-88
< COMPONENT DIAGNOSIS >[VK56DE]
P0011, P0021 IVT CONTROL
4. Maintain the following conditions for at least 20 consecutive seconds.
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to

Page 1416 of 4171

INFINITI QX56 2009 Factory Service Manual
P0011, P0021 IVT CONTROLEC-89
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
OK >> GO TO 3.
NG >> Repair or replace ground connections.
3.CHECK INTAKE VALVE TIMING CONTROL PO
SITION

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