Infiniti G35 (V35). Manual — part 402
DTC P0550 PSP SENSOR
EC-489
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EC
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic Procedure
NBS000UW
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten two ground screws on the body. Refer to
.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
12
L/W
Power steering pressure
sensor
[Engine is running]
●
Steering wheel: Being turned
0.5 - 4.5V
[Engine is running]
●
Steering wheel: Not being turned
0.4 - 0.8V
67
B/W
Sensor ground
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 0V
68
Y
Sensor power supply
(Power steering pressure
sensor)
[Ignition switch: ON]
Approximately 5V
PBIB2192E
EC-490
DTC P0550 PSP SENSOR
2.
CHECK PSP SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect power steering pressure (PSP) sensor harness con-
nector.
2.
Turn ignition switch ON.
3.
Check voltage between PSP sensor terminal 1 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit or short to ground or short to power
in harness or connectors.
3.
CHECK PSP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between PSP sensor terminal 3 and ECM terminal 67.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check harness continuity between ECM terminal 12 and PSP sensor terminal 2.
Refer to Wiring Diagram.
2.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK PSP SENSOR
Refer to
EC-491, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace PSP sensor.
PBIB1281E
Voltage: Approximately 5V
PBIB0188E
Continuity should exist.
Continuity should exist.
DTC P0550 PSP SENSOR
EC-491
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EC
6.
CHECK INTERMITTENT INCIDENT
Refer to
EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END
Component Inspection
NBS000UX
POWER STEERING PRESSURE SENSOR
1.
Reconnect all harness connectors disconnected.
2.
Start engine and let it idle.
3.
Check voltage between ECM terminal 12 and ground under the
following conditions.
Removal and Installation
NBS000UY
POWER STEERING PRESSURE SENSOR
Refer to
.
Condition
Voltage
Steering wheel: Being turned
0.5 - 4.5V
Steering wheel: Not being turned
0.4 - 0.8V
MBIB0126E
EC-492
DTC P0603 ECM POWER SUPPLY
DTC P0603 ECM POWER SUPPLY
PFP:23710
Component Description
NBS000VB
Battery voltage is supplied to the ECM even when the ignition switch
is turned OFF for the ECM memory function of the DTC memory, the
air-fuel ratio feedback compensation value memory, the idle air vol-
ume learning value memory, etc.
On Board Diagnosis Logic
NBS000VC
DTC Confirmation Procedure
NBS000VD
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-II
1.
Turn ignition switch ON and wait at least 1 second.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and let it idle for 1 second.
4.
Turn ignition switch OFF, wait at least 10 seconds, and then turn
ON.
5.
Repeat steps 3 and 4 for four times.
6.
If 1st trip DTC is detected, go to
EC-494, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
PBIB1164E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0603
0603
ECM power supply cir-
cuit
ECM back-up RAM system does not function
properly.
●
Harness or connectors
[The ECM power supply (back-up) circuit
is open or shorted.]
●
ECM
SEF058Y
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