Nissan Quest E52. Manual - part 529

EC-326

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0500 VSS

NO

>> Perform trouble shooting relevant to DTC indicated.

2.

CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

Check DTC with ABS actuator and electric unit (control unit). Refer to 

BRC-30, "CONSULT Function"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Perform trouble shooting relevant to DTC indicated.

3.

CHECK DTC WITH COMBINATION METER

Check DTC with combination meter. Refer to 

MWI-35, "CONSULT Function"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Perform trouble shooting relevant to DTC indicated.

4.

CHECK SECONDARY SPEED SENSOR

Check secondary speed sensor. Refer to 

TM-88, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace or replace error-detected parts.

5.

CHECK WHEEL SENSOR

Check wheel sensor. Refer to 

BRC-64, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

NO

>> Replace or replace error-detected parts.

P0506 ISC SYSTEM

EC-327

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0506 ISC SYSTEM

Description

INFOID:0000000009651159

The ECM controls the engine idle speed to a specified level through the fine adjustment of the air, which is let
into the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is
varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects
the actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value
memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions,
such as during warming up, deceleration and engine load (air conditioner, power steering and cooling fan
operation, etc.). 

DTC Logic

INFOID:0000000009651160

DTC DETECTION LOGIC

NOTE:
If DTC P0506 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.

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.

If the target idle speed is out of the specified value, perform 

EC-137, "Work Procedure"

, before con-

ducting DTC CONFIRMATION PROCEDURE.
TESTING CONDITION:
• Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
• Always perform the test at a temperature above 

−

10

°

C(14

°

F).

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Turn ignition switch ON.

4.

Turn ignition switch OFF and wait at least 10 seconds.

5.

Restart engine and run it for at least 1 minute at idle speed.

6.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to 

EC-327, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009651161

1.

CHECK INTAKE AIR LEAKAGE

1.

Start engine and let it idle.

2.

Listen for an intake air leakage after the mass air flow sensor.

Is intake air leakage detected?

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0506

Idle speed control sys-
tem RPM lower than ex-
pected

The idle speed is less than the target idle speed 
by 100 rpm or more.

• Electric throttle control actuator
• Intake air leakage

EC-328

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0506 ISC SYSTEM

YES

>> Discover air leakage location and repair.

NO

>> Replace ECM. Refer to 

EC-460, "Removal and Installation"

.

P0507 ISC SYSTEM

EC-329

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0507 ISC SYSTEM

Description

INFOID:0000000009651162

The ECM controls the engine idle speed to a specified level through the fine adjustment of the air, which is let
into the intake manifold, by operating the electric throttle control actuator. The operating of the throttle valve is
varied to allow for optimum control of the engine idling speed. The crankshaft position sensor (POS) detects
the actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value
memorized in the ECM. The target engine speed is the lowest speed at which the engine can operate steadily.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions,
such as during warming up, deceleration and engine load (air conditioner, power steering and cooling fan
operation, etc.). 

DTC Logic

INFOID:0000000009651163

DTC DETECTION LOGIC

NOTE:
If DTC P0507 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.

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.

If the target idle speed is out of the specified value, perform 

EC-137, "Work Procedure"

, before con-

ducting DTC Confirmation Procedure.
TESTING CONDITION:
• Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
• Always perform the test at a temperature above 

−

10

°

C(14

°

F).

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Turn ignition switch ON.

4.

Turn ignition switch OFF and wait at least 10 seconds.

5.

Restart engine and run it for at least 1 minute at idle speed.

6.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to 

EC-329, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009651164

1.

CHECK PCV HOSE CONNECTION

Confirm that PCV hose is connected correctly.

Is the inspection result normal?

YES

>> GO TO 2.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0507

Idle speed control sys-
tem RPM higher than 
expected

The idle speed is more than the target idle 
speed by 200 rpm or more.

• Electric throttle control actuator
• Intake air leakage
• PCV system