Infiniti G37 Coupe. Manual - part 539

P0500 VSS

EC-337

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P0500 VSS

Description

INFOID:0000000001734153

The vehicle speed signal is sent to the “unified meter and A/C amp.” from the “ABS actuator and electric unit
(control unit)” by CAN communication line. The “unified meter and A/C amp.” then sends a signal to the ECM
by CAN communication line.

DTC Logic

INFOID:0000000001734154

DTC DETECTION LOGIC

NOTE:
• If DTC P0500 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC

U1000, U1001. Refer to 

EC-146, "DTC Logic"

.

• If DTC P0500 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer

to 

EC-147, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

INSPECTION START

Do you have CONSULT-III?

Do you have CONSULT-III?

YES

>> GO TO 2.

NO

>> GO TO 5.

2.

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.

>> GO TO 3.

3.

CHECK VEHICLE SPEED SENSOR FUNCTION

NOTE:
This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a
road test is expected to be easier, it is unnecessary to lift the vehicle.

With CONSULT-III

1.

Start engine (VDC switch OFF).

2.

Read “VHCL SPEED SE” in “DATA MONITOR” mode with CONSULT-III. The vehicle speed on CON-
SULT-III should exceed 10 km/h (6 MPH) when rotating wheels with suitable gear position.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Go to 

EC-338, "Diagnosis Procedure"

.

4.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Select “DATA MONITOR” mode with CONSULT-III.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0500

Vehicle speed sensor

The almost 0 km/h (0 MPH) signal from 
vehicle speed sensor is sent to ECM even 
when vehicle is being driven.

• Harness or connectors

(The CAN communication line is open or short-
ed)

• Harness or connectors

(The vehicle speed signal circuit is open or 
shorted)

• Wheel sensor
• Unified meter and A/C amp.
• ABS actuator and electric unit (control unit)

EC-338

< COMPONENT DIAGNOSIS >

[VQ37VHR]

P0500 VSS

2.

Warm engine up to normal operating temperature.

3.

Maintain the following conditions for at least 50 consecutive seconds.

CAUTION:

Always drive vehicle at a safe speed.

4.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-338, "Diagnosis Procedure"

.

NO

>> INSPECTION END

5.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to 

EC-338, "Component Function Check"

.

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-338, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000001734155

1.

PERFORM COMPONENT FUNCTION CHECK

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.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-338, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001734156

1.

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

Refer to 

BRC-26, "CONSULT-III Function"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace.

2.

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

Refer to 

MWI-37, "CONSULT-III Function (METER/M&A)"

.

>> INSPECTION END

ENG SPEED

1,800 - 6,000 rpm

COOLAN TEMP/S

More than 70

°

C (158

°

F)

B/FUEL SCHDL

5.0 - 31.8 msec

Selector lever

Except P or N position (A/T)
Except Neutral position (M/T)

PW/ST SIGNAL

OFF

P0506 ISC SYSTEM

EC-339

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P0506 ISC SYSTEM

Description

INFOID:0000000001734157

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:0000000001734158

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-19, "IDLE AIR VOLUME LEARNING :

Special Repair Requirement"

, before conducting DTC Confirmation Procedure.

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).

>> 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

>> Go to 

EC-339, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001734159

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.

Is intake air leak 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 leak

EC-340

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P0506 ISC SYSTEM

YES

>> Discover air leak location and repair.

NO

>> GO TO 2.

2.

REPLACE ECM

1.

Stop engine.

2.

Replace ECM.

3.

Go to 

EC-16, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (ECM) : Special Repair

Requirement"

.

>> INSPECTION END