Infiniti FX35 / FX45. Manual - part 559

DTC P0507 ISC SYSTEM

EC-997

< SERVICE INFORMATION >

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2.

Replace ECM.

3.

Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to

BL-187, "ECM Re-Communicating Function"

.

4.

Perform 

EC-662, "VIN Registration"

.

5.

Perform 

EC-662, "Accelerator Pedal Released Position Learning"

.

6.

Perform 

EC-663, "Throttle Valve Closed Position Learning"

.

7.

Perform 

EC-663, "Idle Air Volume Learning"

.

>> INSPECTION END

EC-998

< SERVICE INFORMATION >

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DTC P0550 PSP SENSOR

DTC P0550 PSP SENSOR

Component Description

INFOID:0000000001326851

Power steering pressure (PSP) sensor is installed to the power
steering high-pressure tube and detects a power steering load. This
sensor is a potentiometer which transforms the power steering load
into output voltage, and emits the voltage signal to the ECM. The
ECM controls the electric throttle control actuator and adjusts the
throttle valve opening angle to increase the engine speed and
adjusts the idle speed for the increased load.

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000001326852

Specification data are reference values.

On Board Diagnosis Logic

INFOID:0000000001326853

The MIL will not light up for this diagnosis.
NOTE:
If DTC P0550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to

EC-1009

.

DTC Confirmation Procedure

INFOID:0000000001326854

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.

1.

Start engine and let it idle for at least 5 seconds.

2.

Check 1st trip DTC.

3.

If 1st trip DTC is detected, go to 

EC-1000, "Diagnosis Procedure"

.

PBIB1484E

MONITOR ITEM

CONDITION

SPECIFICATION

PW/ST SIGNAL

• Engine: After warming up, idle the 

engine

Steering wheel: Not being turned

OFF

Steering wheel: Being turned

ON

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0550
0550

Power steering pressure 
sensor circuit

An excessively low or high voltage from the 
sensor is sent to ECM.

• Harness or connectors

(The sensor circuit is open or shorted)

• Power steering pressure sensor

DTC P0550 PSP SENSOR

EC-999

< SERVICE INFORMATION >

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Wiring Diagram

INFOID:0000000001326855

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.

TBWM0249E

EC-1000

< SERVICE INFORMATION >

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DTC P0550 PSP SENSOR

Diagnosis Procedure

INFOID:0000000001326856

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten three ground screws on the body.
Refer to 

EC-723, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK PSP SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect PSP sensor harness connector.

2.

Turn ignition switch ON.

TER-

MI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

12

R/G

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

SB

Sensor power supply
(Power steering pressure 
sensor)

[Ignition switch: ON]

Approximately 5V

PBIB2195E

PBIB1484E