Infiniti QX56 (JA60). Manual — part 342
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< BASIC INSPECTION >
[VK56DE]
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
.
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)
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ENGINE CONTROL SYSTEM
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< FUNCTION DIAGNOSIS >
[VK56DE]
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FUNCTION DIAGNOSIS
ENGINE CONTROL SYSTEM
System Diagram
INFOID:0000000005149062
JMBIA1719GB
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< FUNCTION DIAGNOSIS >
[VK56DE]
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
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ENGINE CONTROL SYSTEM
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< FUNCTION DIAGNOSIS >
[VK56DE]
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1.
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
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