Infiniti G35 (V35). Manual - part 402

DTC P0550 PSP SENSOR

EC-489

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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 

EC-159, "Ground Inspection"

 .

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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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 

PS-36, "HYDRAULIC LINE"

 .

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