Infiniti G37 Coupe. Manual - part 540

P0507 ISC SYSTEM

EC-341

< COMPONENT DIAGNOSIS >

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P0507 ISC SYSTEM

Description

INFOID:0000000001910897

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:0000000001734161

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-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.

Start 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-341, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001734162

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 leak
• PCV system

EC-342

< COMPONENT DIAGNOSIS >

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P0507 ISC SYSTEM

NO

>> 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.

Is intake air leak detected?

YES

>> Discover air leak location and repair.

NO

>> GO TO 3.

3.

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

P0524 ENGINE OIL PRESSURE

EC-343

< COMPONENT DIAGNOSIS >

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P0524 ENGINE OIL PRESSURE

DTC Logic

INFOID:0000000001903474

DTC DETECTION LOGIC

NOTE:
If DTC P0524 is displayed with DTC P0075 or P0081, first perform the trouble diagnosis for DTC P0075,
P0081. Refer to 

EC-162, "DTC Logic"

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING-I

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.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is between 10V and 16V at
idle.

>> GO TO 2.

2.

PRECONDITIONING-II

Check oil level and oil pressure. Refer to 

LU-6, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Go to 

LU-6, "Inspection"

.

3.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT-III

1.

Select “DATA MONITOR” mode with CONSULT-III.

2.

Maintain the following conditions for at least 20 consecutive seconds.

CAUTION:

Always drive at a safe speed.

3.

Check 1st trip DTC.

With GST

Follow the procedure “With CONSULT-III” above.

DTC No.

Trouble diagnosis 

name

Detecting condition

Possible cause

P0524

Engine oil pressure 
too low

Engine oil pressure is low because there is a 
gap between angle of target and phase-control 
angle.

• Engine oil pressure or level too low
• Crankshaft position sensor (POS)
• Camshaft position sensor (PHASE)
• Intake valve control solenoid valve
• Accumulation of debris to the signal pick-up 

portion of the camshaft

• Timing chain installation
• Foreign matter caught in the oil groove for in-

take valve timing control

ENG SPEED

More than 1,700 rpm

COOLAN TEMP/S

More than 70

°

C (158

°

F)

Selector lever

1st or 2nd position

Driving location uphill

Driving vehicle uphill
(Increased engine load will help maintain the driving 
conditions required for this test.)

EC-344

< COMPONENT DIAGNOSIS >

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P0524 ENGINE OIL PRESSURE

Is 1st trip DTC detected?

YES

>> Go to 

EC-344, "Diagnosis Procedure"

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001910863

1.

CHECK OIL PRESSURE WARNING LAMP

1.

Start engine.

2.

Check oil pressure warning lamp and confirm it is not illumi-
nated.

Is oil pressure warning lamp illuminated?

YES

>> Go to 

LU-6, "Inspection"

.

NO

>> GO TO 2.

2.

CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE

Refer to 

EC-153, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace malfunctioning intake valve timing control solenoid valve.

3.

CHECK CRANKSHAFT POSITION SENSOR (POS)

Refer to 

EC-267, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace crankshaft position sensor (POS).

4.

CHECK CAMSHAFT POSITION SENSOR (PHASE)

Refer to 

EC-271, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace malfunctioning camshaft position sensor (PHASE).

5.

CHECK CAMSHAFT (INTAKE)

Check the following.
• Accumulation of debris to the signal plate of camshaft front end
• Chipping signal plate of camshaft front end

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Remove debris and clean the signal plate of camshaft

front end or replace camshaft.

6.

CHECK TIMING CHAIN INSTALLATION

Check service records for any recent repairs that may cause timing chain misaligned.

Are there any service records that may cause timing chain misaligned?

YES

>> Check timing chain installation. Refer to 

EM-49, "Removal and Installation"

.

NO

>> GO TO 7.

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