2009 INFINITI QX56 Factory Service Manual

ESP inoperative sunroof engine overheat immobilizer transmission wiper fluid

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INFINITI QX56 2009 Factory Service Manual
EC-274
< COMPONENT DIAGNOSIS >[VK56DE]
P0506 ISC SYSTEM
6. Perform
EC-18, "Throttle Valve Closed Position Learning" .
7. Perform EC-18, "Idle Air Volume Learning"
.
>> INSPECTION END
Revision: Dec

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INFINITI QX56 2009 Factory Service Manual
P0507 ISC SYSTEMEC-275
< COMPONENT DIAGNOSIS > [VK56DE]
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P0507 ISC SYSTEM
DescriptionINFOID:0000000003771550
NOTE:
If DTC P0507 is displayed with ot
her DTC, first perf

P0507 ISC SYSTEMEC-275
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P0507 ISC SYSTEM
DescriptionINFOID:0000000003771550
NOTE:
If DTC P0507 is displayed with ot
her DTC, first perform the trouble diagnosis for the other DTC.
The ECM controls the engine idle speed to a specified leve l through the fine adjustment of the air, which is let
into the intake manifold, by operating the electric thrott le control actuator. The operating of the throttle valve is
varied to allow for optimum control of the engine idli ng 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 t he 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 LogicINFOID:0000000003771551
DTC Confirmation ProcedureINFOID:0000000003771552
NOTE:
If DTC Confirmation Procedure has been previously c onducted, always perform the following before con-
ducting the next step.
1. Turn ignition swich OFF and wait at least 10 seconds.
2. Turn ignition swich ON.
3. Turn ignition swich OFF and wait at least 10 seconds.
If the target idle speed is ou t of the specified value, perform EC-18, "Idle Air Volume Learning"
,
before conducting DTC Confirmation Procedure. For the target idle speed, refer to the EC-495, "Idle
Speed and Ignition Timing".
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).
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. Start engine and run it for at least 1 minute at idle speed.
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to EC-275, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003771553
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.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0507
0507 Idle speed control system
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
Revision: December 20092009 QX56

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INFINITI QX56 2009 Factory Service Manual
EC-276
< COMPONENT DIAGNOSIS >[VK56DE]
P0507 ISC SYSTEM
3.REPLACE ECM
1. Stop engine.
2. Replace ECM.
3. Perform initialization of IVIS(NAT S) system and registration of all IVIS(NATS) ignition key I

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INFINITI QX56 2009 Factory Service Manual
P0550 PSP SENSOREC-277
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P0550 PSP SENSOR
Component DescriptionINFOID:0000000003771554
Power steering pressure (PSP) sensor (1) is insta

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INFINITI QX56 2009 Factory Service Manual
EC-278
< COMPONENT DIAGNOSIS >[VK56DE]
P0550 PSP SENSOR
2.CHECK PSP SENSOR POWER SUPPLY CIRCUIT
1. Disconnect power steering pressure (PSP) sensor (1) harness connector.
2. Turn ignition switch ON.
3

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INFINITI QX56 2009 Factory Service Manual
P0550 PSP SENSOREC-279
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Component InspectionINFOID:0000000003771558
POWER STEERING PRESSURE SENSOR
1. Reconnect all harness connectors

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INFINITI QX56 2009 Factory Service Manual
EC-280
< COMPONENT DIAGNOSIS >[VK56DE]
P0603 ECM POWER SUPPLY
P0603 ECM POWER SUPPLY
DescriptionINFOID:0000000003771559
Battery voltage is supplied to the ECM even when the ignition switch
is turned

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INFINITI QX56 2009 Factory Service Manual
P0603 ECM POWER SUPPLYEC-281
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3. Check voltage between ECM terminal 121 and ground with
CONSULT-III or tester.
OK or NG
OK >> GO TO 3.

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