2010 INFINITI QX56 Factory Service Manual

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Page 1633 of 4210

INFINITI QX56 2010 Factory Service Manual EC-280
< COMPONENT DIAGNOSIS >[VK56DE]
P0507 ISC SYSTEM
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

Page 1634 of 4210

INFINITI QX56 2010 Factory Service Manual P0550 PSP SENSOREC-281
< COMPONENT DIAGNOSIS > [VK56DE]
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P0550 PSP SENSOR
Component DescriptionINFOID:0000000005149311
Power steering pressure (PSP) sensor (1) is instal

Page 1635 of 4210

INFINITI QX56 2010 Factory Service Manual EC-282
< 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.

Page 1636 of 4210

INFINITI QX56 2010 Factory Service Manual P0550 PSP SENSOREC-283
< COMPONENT DIAGNOSIS > [VK56DE]
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Component InspectionINFOID:0000000005149315
POWER STEERING PRESSURE SENSOR
1. Reconnect all harness connectors d

Page 1637 of 4210

INFINITI QX56 2010 Factory Service Manual EC-284
< COMPONENT DIAGNOSIS >[VK56DE]
P0603 ECM POWER SUPPLY
P0603 ECM POWER SUPPLY
Component DescriptionINFOID:0000000005149316
Battery voltage is supplied to the ECM even when the ignition switch
i

Page 1638 of 4210

INFINITI QX56 2010 Factory Service Manual P0603 ECM POWER SUPPLYEC-285
< COMPONENT DIAGNOSIS > [VK56DE]
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• IPDM E/R connector E121
• 20A fuse (No. 53)
• Harness for open or short between ECM and battery
>>

Page 1639 of 4210

INFINITI QX56 2010 Factory Service Manual EC-286
< COMPONENT DIAGNOSIS >[VK56DE]
P0605 ECM
P0605 ECM
Component DescriptionINFOID:0000000005149320
The ECM consists of a microcomputer and connectors for signal
input and output and for power sup

EC-286
< COMPONENT DIAGNOSIS >[VK56DE]
P0605 ECM
P0605 ECM
Component DescriptionINFOID:0000000005149320
The ECM consists of a microcomputer and connectors for signal
input and output and for power supply. The ECM controls the engine.
On Board Diagn
osis LogicINFOID:0000000005149321
This self-diagnosis has one or two trip detection logic.
FA I L - S A F E M O D E
ECM enters fail-safe mode when the malfunction A is detected.
DTC Confirmation ProcedureINFOID:0000000005149322
Perform PROCEDURE FOR MALFUNCTION A first. If the 1st trip DTC cannot be confirmed, perform
PROCEDURE FOR MALFUNCTION B. If there is no malfunction on PROCEDURE FOR MALFUNCTION
B, perform PROCEDURE FOR MALFUNCTION C.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next step.
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.
PROCEDURE FOR MALFUNCTION A
1. Turn ignition switch ON.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to EC-287, "
Diagnosis Procedure"
PROCEDURE FOR MALFUNCTION B
1. Turn ignition switch ON and wait at least 1 second.
2. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
3. Check 1st trip DTC.
4. If 1st trip DTC is detected, go to EC-287, "
Diagnosis Procedure".
PROCEDURE FOR MALFUNCTION C
1. Turn ignition switch ON and wait at least 1 second.
2. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
PBIB1164E
DTC No. Trouble diagnosis name DTC detecting conditionPossible cause
P0605
0605 Engine control module A) ECM calculation function is malfunctioning.
•ECM
B) ECM EEP-ROM system is malfunctioning.
C) ECM self shut-off function is malfunctioning.
Detected items Engine operation condition in fail-safe mode
Malfunction A • ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx.
5 degrees) by the return spring.
• ECM deactivates ASCD operation.
Revision: April 20092010 QX56

Page 1640 of 4210

INFINITI QX56 2010 Factory Service Manual P0605 ECMEC-287
< COMPONENT DIAGNOSIS > [VK56DE]
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3. Repeat step 2 for 32 times.
4. Check 1st trip DTC.
5. If 1st trip DTC is detected, go to
EC-287, "
Diagnosis Proced

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