2011 INFINITI QX56 Factory Service Manual

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Page 2409 of 5598

INFINITI QX56 2011 Factory Service Manual
P0850 PNP SWITCHEC-385
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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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

Page 2410 of 5598

INFINITI QX56 2011 Factory Service Manual
EC-386
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
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 P109

Page 2411 of 5598

INFINITI QX56 2011 Factory Service Manual
P1089, P1092 VVEL CONTROL SHAFT POSITION SENSOR
EC-387
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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P1089, P1092 VVEL CONTROL
SHAFT POSITION SENSOR
DTC LogicINFOID:000000000621

P1089, P1092 VVEL CONTROL SHAFT POSITION SENSOR
EC-387
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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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

Page 2412 of 5598

INFINITI QX56 2011 Factory Service Manual
EC-388
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1089, P1092 VVEL CONTRO
L SHAFT POSITION SENSOR
Harness for open or short between VVEL control shaft position sensor and VVEL control module
Loose or po

EC-388
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1089, P1092 VVEL CONTRO
L SHAFT POSITION SENSOR
Harness for open or short between VVEL control shaft position sensor 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 CONTROL SHAFT POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect VVEL control module harness connector.
3. Check the continuity between VVEL control shaf t position sensor harness connector and VVEL control
module harness connector.
4. Also check harness for short to ground and 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 VVEL control shaft position sensor 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.
5.VVEL CONTROL SHAFT POSITI ON SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between VVEL control shaf t position sensor harness connector and VVEL control
module harness connector.
2. Also check harness for short to ground and power.
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
Harness for open or short between VVEL control shaft position sensor 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.
7.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
DTC No. VVEL control shaft position
sensor VVEL control module
Continuity
Bank Connector Terminal Connector Terminal
P1089 1 F72 2
F56 6
Existed
519
P1092 2 F70 24
517
DTC No.VVEL control shaft position
sensor VVEL control module
Continuity
Bank Connector Terminal Connector Terminal
P1089 1 F72 1
F56 3
Existed
416
P1092 2 F70 15
418
Revision: 2010 May2011 QX56

Page 2413 of 5598

INFINITI QX56 2011 Factory Service Manual
P1089, P1092 VVEL CONTROL SHAFT POSITION SENSOR
EC-389
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair or replace.
8.R

Page 2414 of 5598

INFINITI QX56 2011 Factory Service Manual
EC-390
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1090, P1093 VVEL ACTUATOR MOTOR
P1090, P1093 VVEL ACTUATOR MOTOR
DTC LogicINFOID:0000000006217896
DTC DETECTION LOGIC
NOTE:
If DTC P1090 or P1093 is displaye

EC-390
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
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

Page 2415 of 5598

INFINITI QX56 2011 Factory Service Manual
P1090, P1093 VVEL ACTUATOR MOTOREC-391
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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4. Also check harness for short to ground and power.
Is the inspection result normal?
YES >>

Page 2416 of 5598

INFINITI QX56 2011 Factory Service Manual
EC-392
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P1090, P1093 VVEL ACTUATOR MOTOR
Is the inspection result normal?
YES >> GO TO 12.
NO >> GO TO 11.
11 .REPLACE VVEL LADDER ASSEMBLY
Replace VVEL ladder assemb

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