Infiniti G35 (V35). Manual - part 401

DTC P0507 ISC SYSTEM

EC-485

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EC

DTC P0507 ISC SYSTEM

PFP:23781

Description

NBS000UN

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

NBS000UO

DTC Confirmation Procedure

NBS000UP

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-79, "Idle Air Volume Learning"

 ,

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

EC-685, "SER-

VICE DATA AND SPECIFICATIONS (SDS)"

 .

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-486, "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 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

SEF174Y

EC-486

DTC P0507 ISC SYSTEM

Diagnostic Procedure

NBS000UQ

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

BL-217, "ECM Re-Communicating Function"

 .

4.

Perform 

EC-77, "VIN Registration"

 .

5.

Perform 

EC-78, "Exhaust Valve Timing Control Learning (M/T models)"

 .

6.

Perform 

EC-79, "Accelerator Pedal Released Position Learning"

 .

7.

Perform 

EC-79, "Throttle Valve Closed Position Learning"

 .

8.

Perform 

EC-79, "Idle Air Volume Learning"

 .

>> INSPECTION END

DTC P0550 PSP SENSOR

EC-487

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EC

DTC P0550 PSP SENSOR

PFP:49763

Component Description

NBS000UR

Power steering pressure (PSP) sensor is installed to the power
steering high-pressure tube and detects a power steering load. This
sensor is a potentiometer which transforms the power steering load
into output voltage, and emits the voltage signal to the ECM. The
ECM controls the electric throttle control actuator and adjusts the
throttle valve opening angle to increase the engine speed and
adjusts the idle speed for the increased load.

CONSULT-II Reference Value in Data Monitor Mode

NBS000US

Specification data are reference values.

On Board Diagnosis Logic

NBS000UT

The MIL will not light up for this self-diagnosis.

NOTE:
If DTC P0550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.
Refer to 

EC-499, "DTC P0643 SENSOR POWER SUPPLY"

 .

DTC Confirmation Procedure

NBS000UU

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.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and let it idle for at least 5 seconds.

4.

If 1st trip DTC is detected, go to 

EC-489, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

PBIB1281E

MONITOR ITEM

CONDITION

SPECIFICATION

PW/ST SIGNAL

●

Engine: After warming up, idle 
the engine

Steering wheel: Not being turned

OFF

Steering wheel: Being turned

ON

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0550
0550

Power steering pres-
sure sensor circuit

An excessively low or high voltage from the 
sensor is sent to ECM.

●

Harness or connectors
(The sensor circuit is open or shorted)

●

Power steering pressure sensor

SEF058Y

EC-488

DTC P0550 PSP SENSOR

Wiring Diagram

NBS000UV

TBWM0350E