Infiniti QX56 (JA60). Manual - part 342

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< BASIC INSPECTION >

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INSPECTION AND ADJUSTMENT

13. If idle speed and ignition timing are not within the specification, Idle Air Volume Learning will not be carried

out successfully. In this case, find the cause of the incident by referring to the DIAGNOSTIC PROCE-

DURE below.

DIAGNOSTIC PROCEDURE

If idle air volume learning cannot be performed successfully, proceed as follows:
1. Check that throttle valve is fully closed.
2. Check PCV valve operation.
3. Check that downstream of throttle valve is free from air leakage.
4. When the above three items check out OK, engine component parts and their installation condi-

tion are questionable. Check and eliminate the cause of the incident. 

It is useful to perform 

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 .

5. If any of the following conditions occur after the engine has started, eliminate the cause of the

incident and perform Idle Air Volume Learning all over again:

• Engine stalls.

• Erroneous idle.

ITEM

SPECIFICATION

Idle speed

650 

± 50 rpm (in P or N position)

Ignition timing

15 

± 5° BTDC (in P or N position)

ENGINE CONTROL SYSTEM

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FUNCTION DIAGNOSIS

ENGINE CONTROL SYSTEM

System Diagram

INFOID:0000000005149062

JMBIA1719GB

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< FUNCTION DIAGNOSIS >

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ENGINE CONTROL SYSTEM

Engine Control Component Parts Location

INFOID:0000000005149063

1.

ECM

2.

Battery current sensor

3.

Power steering pressure sensor

4.

Ignition coil (with power transistor) 
and spark plug (bank 2)

5.

Refrigerant pressure sensor

6.

Intake valve timing control position 
sensor (bank 2)

7.

Intake valve timing control solenoid 
valve (bank 2)

8.

Engine coolant temperature sensor

9.

Electric throttle control actuator

10. Intake valve timing control position 

sensor (bank 1)

11. Intake valve timing control solenoid 

valve (bank 1)

12. Cooling fan motor 

13. Camshaft position sensor (PHASE)

14. Ignition coil (with power transistor) 

and spark plug (bank 1)

15. Mass air flow sensor (with intake air 

temperature sensor)

16. A/F sensor 1 (bank 1)

17. EVAP service port

18. Fuel injector (bank 1)

19. Knock sensor (bank 1)

20. EVAP canister purge volume control 

solenoid valve

21. Knock sensor (bank 2)

22. Fuel injector (bank 2)

23. A/F sensor 1 (bank 2)

24. IPDM E/R

BBIA0743E

ENGINE CONTROL SYSTEM

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Body ground (view with battery re-
moved)

2.

Body ground (view with battery re-
moved)

3.

Body ground

4.

No. 1 ignition coil

5.

Engine ground

6.

Mass air flow sensor (with intake air 
temperature sensor)

7.

IPDM E/R

8.

Battery

9.

Radiator hose

BBIA0778E