Infiniti F50. Manual - part 439

DTC P0506 ISC SYSTEM

EC-397

C

D

E

F

G

H

I

J

K

L

M

A

EC

DTC P0506 ISC SYSTEM

PFP:23781

Description

EBS00MG3

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

On Board Diagnosis Logic

EBS00MG4

DTC Confirmation Procedure

EBS00MG5

NOTE:

●

If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF” and
wait at least 10 seconds before conducting the next test.

●

If the target idle speed is out of the specified value, perform “Idle Air Volume Learning”, 

EC-46

 ,

before conducting “DTC Confirmation Procedure”. For the target idle speed, refer to the “Service
Data and Specifications (SDS)”, 

EC-698

 .

TESTING CONDITION:

●

Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

●

Always perform the test at a temperature above 

−

10

°

C (14

°

F).

 WITH CONSULT-II

1.

Open engine hood.

2.

Start engine and warm it up to normal operating temperature.

3.

Turn ignition switch “OFF” and wait at least 10 seconds.

4.

Turn ignition switch “ON” again and select “DATA MONITOR”
mode with CONSULT-II.

5.

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

6.

If 1st trip DTC is detected, go to 

EC-398, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0506
0506

Idle speed control system 
RPM lower than expected

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

●

Electric throttle control actuator

●

Intake air leak

SEF174Y

EC-398

DTC P0506 ISC SYSTEM

Diagnostic Procedure

EBS00MG6

1. 

CHECK INTAKE AIR LEAK

1.

Start engine and let it idle.

2.

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

OK or NG

OK

>> GO TO 2.

NG

>> Discover air leak location and repair.

2. 

REPLACE ECM

1.

Stop engine.

2.

Replace ECM.

3.

Perform initialization of NATS system and registration of all NATS ignition key IDs. Refer to 

BL-200, "ECM

Re-communicating Function"

 .

4.

Perform 

EC-46, "Accelerator Pedal Released Position Learning"

 .

5.

Perform 

EC-46, "Throttle Valve Closed Position Learning"

 .

6.

Perform 

EC-46, "Idle Air Volume Learning"

 .

>> INSPECTION END

DTC P0507 ISC SYSTEM

EC-399

C

D

E

F

G

H

I

J

K

L

M

A

EC

DTC P0507 ISC SYSTEM

PFP:23781

Description

EBS00MG7

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

On Board Diagnosis Logic

EBS00MG8

DTC Confirmation Procedure

EBS00MG9

NOTE:

●

If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF” and
wait at least 10 seconds before conducting the next test.

●

If the target idle speed is out of the specified value, perform “Idle Air Volume Learning”, 

EC-46

 ,

before conducting “DTC Confirmation Procedure”. For the target idle speed, refer to the “Service
Data and Specifications (SDS)”, 

EC-698

 .

TESTING CONDITION:

●

Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

●

Always perform the test at a temperature above 

−

10

°

C (14

°

F).

 WITH CONSULT-II

1.

Open engine hood.

2.

Start engine and warm it up to normal operating temperature.

3.

Turn ignition switch “OFF” and wait at least 10 seconds.

4.

Turn ignition switch “ON” again and select “DATA MONITOR”
mode with CONSULT-II.

5.

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

6.

If 1st trip DTC is detected, go to 

EC-400, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0507
0507

Idle speed control system 
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 leak

●

PCV system

SEF174Y

EC-400

DTC P0507 ISC SYSTEM

Diagnostic Procedure

EBS00MGA

1. 

CHECK PCV HOSE CONNECTION

Confirm that PCV hose is connected correctly.
OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace.

2. 

CHECK INTAKE AIR LEAK

1.

Start engine and let it idle.

2.

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

OK or NG

OK

>> GO TO 3.

NG

>> Discover air leak location and repair.

3. 

REPLACE ECM

1.

Stop engine.

2.

Replace ECM.

3.

Perform initialization of NATS system and registration of all NATS ignition key IDs. Refer to 

BL-200, "ECM

Re-communicating Function"

 .

4.

Perform 

EC-46, "Accelerator Pedal Released Position Learning"

 .

5.

Perform 

EC-46, "Throttle Valve Closed Position Learning"

 .

6.

Perform 

EC-46, "Idle Air Volume Learning"

 .

>> INSPECTION END