Infiniti FX35, FX50 (S51). Manual - part 861

P1090, P1093 VVEL ACTUATOR MOTOR

EC-985

< DTC/CIRCUIT DIAGNOSIS >

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P1090, P1093 VVEL ACTUATOR MOTOR

Description

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The VVEL actuator motor rotates the control shaft according to the control signal from the VVEL control mod-
ule. The VVEL control module judges whether the VVEL actuator motor controls the angle properly by the
VVEL control shaft position sensor signal.

DTC Logic

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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-989, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting 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 10 V 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-985, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

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1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-39, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

VVEL ACTUATOR MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect VVEL control module harness connector.

2.

Disconnect VVEL actuator motor harness connector.

3.

Check the continuity between VVEL control module harness connector and VVEL actuator motor harness
connector.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1090

VVEL system performance 
(bank 1)

• Event angle difference between the 

actual and the target is detected.

• Abnormal current is sent to VVEL 

actuator motor.

• Harness or connectors

(VVEL actuator motor circuit is open or shorted.)

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

P1093

VVEL system performance 
(bank 2)

EC-986

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

P1090, P1093 VVEL ACTUATOR MOTOR

4.

Also check harness for short to ground and power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F10, E10
• Harness for open or short between VVEL actuator motor and VVEL control module

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

4.

CHECK VVEL ACTUATOR MOTOR

Refer to 

EC-987, "Component Inspection (VVEL ACTUATOR MOTOR)"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

REPLACE VVEL ACTUATOR SUB ASSEMBLY

1.

Replace VVEL actuator sub assembly.

2.

Perform 

EC-988, "Special Repair Requirement"

.

>> INSPECTION END

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace.

7.

REPLACE VVEL CONTROL MODULE

1.

Replace VVEL control module.

2.

Perform 

EC-579, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (VVEL CONTROL

MODULE) : Special Repair Requirement"

.

>> GO TO 8.

8.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON.

2.

Erase DTC.

3.

Perform DTC Confirmation Procedure.
See 

EC-985, "DTC Logic"

.

Is the DTC P1090 or P1093 displayed again?

DTC No.

VVEL control module

VVEL actuator motor

Continuity

Bank

Connector

Terminal

Connector

Terminal

P1090

1

E16

12

F73

1

Existed

2

Not existed

25

1

Not existed

2

Existed

P1093

2

2

F71

1

Existed

2

Not existed

15

1

Not existed

2

Existed

P1090, P1093 VVEL ACTUATOR MOTOR

EC-987

< DTC/CIRCUIT DIAGNOSIS >

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YES

>> GO TO 9.

NO >> INSPECTION 

END

9.

CHECK VVEL ACTUATOR SUB ASSEMBLY

Refer to 

EC-987, "Component Inspection (VVEL ACTUATOR SUB ASSEMBLY)"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> GO TO 10.

10.

REPLACE VVEL ACTUATOR SUB ASSEMBLY

1.

Replace VVEL actuator sub assembly.

2.

Perform 

EC-988, "Special Repair Requirement"

.

>> INSPECTION END

11.

CHECK VVEL LADDER ASSEMBLY

Refer to 

EM-236, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> GO TO 12.

12.

REPLACE CYLINDER HEAD, VVEL LADDER ASSEMBLY AND VVEL ACTUATOR SUB ASSEMBLY

1.

Replace cylinder head, VVEL ladder assembly and VVEL actuator sub assembly.

2.

Perform 

EC-988, "Special Repair Requirement"

.

>> INSPECTION END

13.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (VVEL ACTUATOR MOTOR)

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1.

CHECK VVEL ACTUATOR MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect VVEL actuator motor harness connector.

3.

Check resistance between VVEL actuator motor terminals as per the following.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

REPLACE VVEL ACTUATOR SUB ASSEMBLY

1.

Replace VVEL actuator sub assembly.

2.

Perform 

EC-988, "Special Repair Requirement"

.

>> INSPECTION END

Component Inspection (VVEL ACTUATOR SUB ASSEMBLY)

INFOID:0000000005237462

1.

CHECK VVEL ACTUATOR SUB ASSEMBLY

1.

Turn ignition switch OFF.

VVEL actuator motor

Resistance

Terminal

1 and 2

16

Ω

 or less

EC-988

< DTC/CIRCUIT DIAGNOSIS >

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P1090, P1093 VVEL ACTUATOR MOTOR

2.

Remove VVEL actuator sub assembly. Refer to 

EM-228, "Disassembly and Assembly"

.

3.

Turn the ball screw shaft to check that it works smoothly.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

REPLACE VVEL ACTUATOR SUB ASSEMBLY

1.

Replace VVEL actuator sub assembly.

2.

Perform 

EC-988, "Special Repair Requirement"

.

>> INSPECTION END

Special Repair Requirement

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1.

PERFORM VVEL CONTROL SHAFT POSITION SENSOR ADJUSTMENT

Refer to 

EC-583, "VVEL CONTROL SHAFT POSITION SENSOR ADJUSTMENT : Special Repair Require-

ment"

.

>> GO TO 2.

2.

PERFORM IDLE AIR VOLUME LEARNING

Refer to 

EC-582, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"

.

>> END