Infiniti G37 Coupe. Manual - part 547

P1087, P1088 VVEL SYSTEM

EC-369

< COMPONENT DIAGNOSIS >

[VQ37VHR]

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P1087, P1088 VVEL SYSTEM

DTC Logic

INFOID:0000000001736759

DTC DETECTION LOGIC

NOTE:
If DTC P1087 or P1088 is displayed with DTC P1090 or P1093.
Perform the trouble diagnosis for DTC P1090 or P1093. Refer to 

EC-374, "DTC Logic"

.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1087

VVEL small event angle malfunction 
(bank 1)

The event angle of VVEL control 
shaft is always small.

• Harness or connectors

(VVEL actuator motor circuit is 
open or shorted.)

• VVEL actuator motor
• VVEL actuator sub assembly
• VVEL ladder assembly
• VVEL control module

P1088

VVEL small event angle malfunction 
(bank 2)

EC-370

< COMPONENT DIAGNOSIS >

[VQ37VHR]

P1089, P1092 VVEL CONTROL SHAFT POSITION SENSOR

P1089, P1092 VVEL CONTROL SHAFT POSITION SENSOR

Description

INFOID:0000000001736764

VVEL control shaft position sensor (1) is placed on VVEL actuator
sub assembly and detects the control shaft position angle.
A magnet is pressed into the arm on the edge of control shaft.
The magnetic field changes as the magnet rotates together with the
arm resulting in the output voltage change of the sensor.
VVEL control module detects the actual position angle through the
voltage change and sends the signal to ECM.

DTC Logic

INFOID:0000000001736765

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-451, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test. 
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 10V 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-370, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001736766

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-41, "Circuit Inspection"

.

JMBIA0835ZZ

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1089

VVEL control shaft position sensor 
(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 po-
sition sensor 1 and VVEL control shaft 
position sensor 2.

• Harness or connectors

(VVEL control shaft position sensor 
circuit is open or shorted.)

• VVEL control shaft position sensor
• VVEL control module

P1092

VVEL control shaft position sensor 
(bank 2) circuit

P1089, P1092 VVEL CONTROL SHAFT POSITION SENSOR

EC-371

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Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

VVEL CONTROL SHAFT POSITION SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect VVEL control shaft position sensor harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between VVEL control shaft position sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F1, E3
• Harness for open or short between VVEL control shaft position sensor and VVEL control module

>> Repair open circuit or short to ground or short to power in harness or connectors.

4.

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 shaft 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 6.

NO

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F1, E3
• Harness for open or short between VVEL control shaft position sensor and VVEL control module

>> Repair open circuit or short to ground or short to power in harness or connectors.

6.

VVEL CONTROL SHAFT POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check the continuity between VVEL control shaft position sensor harness connector and VVEL control
module harness connector.

DTC No.

VVEL control shaft position sensor

Ground

Voltage

Bank

Connector

Terminal

P1089

1

F46

3

Ground

Approx. 5V

6

P1092

2

F47

3

6

DTC No.

VVEL control shaft position sensor

VVEL control module

Continuity

Bank

Connector

Terminal

Connector

Terminal

P1089

1

F46

2

E15

4

Existed

5

17

P1092

2

F47

2

6

5

19

EC-372

< COMPONENT DIAGNOSIS >

[VQ37VHR]

P1089, P1092 VVEL CONTROL SHAFT POSITION SENSOR

2.

Also check harness for short to ground and power.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 7.

7.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F1, E3
• Harness for open or short between VVEL control shaft position sensor and VVEL control module

>> Repair open circuit or short to ground or short to power in harness or connectors.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

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Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair or replace.

9.

REPLACE VVEL CONTROL MODULE

1.

Replace VVEL control module.

2.

Go to 

EC-17, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (VVEL CONTROL MOD-

ULE) : Special Repair Requirement"

.

>> GO TO 10.

10.

PERFORM DTC CONFIRMATION PROCEDURE

 With CONSULT-III

1.

Turn ignition switch ON.

2.

Select “SELF-DIAG RESULTS” mode with CONSULT-III.

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

EC-370, "DTC Logic"

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 With GST

1.

Turn ignition switch ON.

2.

Select Service $04 with GST.

3.

Perform DTC Confirmation Procedure.
See 

EC-370, "DTC Logic"

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Is the DTC P1089 or P1092 displayed again?

YES

>> GO TO 11.

NO

>> INSPECTION END

11.

REPLACE VVEL ACTUATOR SUB ASSEMBLY

1.

Replace VVEL actuator sub assembly.

2.

Go to 

EC-373, "Special Repair Requirement"

.

>> INSPECTION END

DTC No.

VVEL control shaft position sensor

VVEL control module

Continuity

Bank

Connector

Terminal

Connector

Terminal

P1089

1

F46

1

E15

3

Existed

4

16

P1092

2

F47

1

5

4

18