Infiniti FX35 / FX45. Manual - part 558

DTC P0500 VSS

EC-993

< SERVICE INFORMATION >

[VK45DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

6.

Check 1st trip DTC.

7.

If 1st trip DTC is detected, go to 

EC-993, "Diagnosis Procedure"

.

Overall Function Check

INFOID:0000000001326841

Use this procedure to check the overall function of the vehicle speed sensor circuit. During this check, a 1st
trip DTC might not be confirmed.

 WITH GST

1.

Lift up drive wheels.

2.

Start engine.

3.

Read vehicle speed sensor signal in “Service $01” with GST.
The vehicle speed sensor on GST should be able to exceed 10 km/h (6 MPH) when rotating wheels with
suitable gear position.

4.

If NG, go to 

EC-993, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001326842

1.

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

Refer to 

BRC-13

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace.

2.

CHECK DTC WITH “UNIFIED METER AND A/C AMP.”

Refer to 

DI-5

.

>> INSPECTION END

Selector lever

Except P or N position

PW/ST SIGNAL

OFF

EC-994

< SERVICE INFORMATION >

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DTC P0506 ISC SYSTEM

DTC P0506 ISC SYSTEM

Description

INFOID:0000000001326843

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

INFOID:0000000001326844

DTC Confirmation Procedure

INFOID:0000000001326845

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 

EC-663, "Idle Air Volume Learning"

,

before conducting DTC Confirmation Procedure. For the target idle speed, refer to the 

EC-1196

.

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-III

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.

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

5.

Check 1st trip DTC.

6.

If 1st trip DTC is detected, go to 

EC-994, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001326846

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 IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to

BL-187, "ECM Re-Communicating Function"

.

4.

Perform 

EC-662, "VIN Registration"

.

5.

Perform 

EC-662, "Accelerator Pedal Released Position Learning"

.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0506
0506

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 leak

DTC P0506 ISC SYSTEM

EC-995

< SERVICE INFORMATION >

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C

D

E

F

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EC

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P

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6.

Perform 

EC-663, "Throttle Valve Closed Position Learning"

.

7.

Perform 

EC-663, "Idle Air Volume Learning"

.

>> INSPECTION END

EC-996

< SERVICE INFORMATION >

[VK45DE]

DTC P0507 ISC SYSTEM

DTC P0507 ISC SYSTEM

Description

INFOID:0000000001326847

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

INFOID:0000000001326848

DTC Confirmation Procedure

INFOID:0000000001326849

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 

EC-663, "Idle Air Volume Learning"

,

before conducting DTC Confirmation Procedure. For the target idle speed, refer to the 

EC-1196

.

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).

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.

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

5.

Check 1st trip DTC.

6.

If 1st trip DTC is detected, go to 

EC-996, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001326850

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.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0507
0507

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 leak
• PCV system