2008 INFINITI QX56 Factory Service Manual

Page 1585 of 4083

INFINITI QX56 2008  Factory Service Manual EC-286
< COMPONENT DIAGNOSIS >[VK56DE]
P0550 PSP SENSOR
P0550 PSP SENSOR
Component DescriptionINFOID:0000000001351667
Power steering pressure (PSP) sensor (1) is installed to the power
steering high-p

Page 1586 of 4083

INFINITI QX56 2008  Factory Service Manual P0550 PSP SENSOREC-287
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
OK >> GO TO 2.
NG >> Repair or replace ground connections.
2.CHECK PSP SENSOR POWER SUPPLY CIRCUIT
1. Disconnect

Page 1587 of 4083

INFINITI QX56 2008  Factory Service Manual EC-288
< COMPONENT DIAGNOSIS >[VK56DE]
P0550 PSP SENSOR
>>
INSPECTION END
Component InspectionINFOID:0000000001351673
POWER STEERING PRESSURE SENSOR
1. Reconnect all harness connectors disconnected.
2

Page 1588 of 4083

INFINITI QX56 2008  Factory Service Manual P0603 ECM POWER SUPPLYEC-289
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
P0603 ECM POWER SUPPLY
DescriptionINFOID:0000000006084568
Battery voltage is supplied to the ECM even when

Page 1589 of 4083

INFINITI QX56 2008  Factory Service Manual EC-290
< COMPONENT DIAGNOSIS >[VK56DE]
P0603 ECM POWER SUPPLY
3. Check voltage between ECM terminal 121 and ground with
CONSULT-III or tester.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2.DETECT MALFUNCTI

Page 1590 of 4083

INFINITI QX56 2008  Factory Service Manual P0605 ECMEC-291
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
P0605 ECM
Component DescriptionINFOID:0000000001351680
The ECM consists of a microcomputer and connectors for signal
in

Page 1591 of 4083

INFINITI QX56 2008  Factory Service Manual EC-292
< COMPONENT DIAGNOSIS >[VK56DE]
P0605 ECM
Follow the procedure “With CONSULT-III” above.
PROCEDURE FOR MALFUNCTION C
 With CONSULT-III
1. Turn ignition switch ON and wait at least 1 second.

Page 1592 of 4083

INFINITI QX56 2008  Factory Service Manual P0643 SENSOR POWER SUPPLYEC-293
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
P0643 SENSOR POWER SUPPLY
On Board Diagnosis LogicINFOID:0000000001351684
This self-diagnosis has the o