Nissan Pathfinder (2006 year). Manual - part 201

 

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Nissan Pathfinder (2006 year). Manual - part 201

 

 

DTC P0550 PSP SENSOR

EC-467

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2006 Pathfinder

DTC P0550 PSP SENSOR

PFP:49763

Component Description

UBS00KB4

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-II Reference Value in Data Monitor Mode

UBS00KB5

Specification data are reference values.

On Board Diagnosis Logic

UBS00KB6

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-479, "DTC P0643 SENSOR POWER SUPPLY"

 .

DTC Confirmation Procedure

UBS00KB7

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.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

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

4.

If 1st trip DTC is detected, go to 

EC-469, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

BBIA0552E

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 pres-
sure 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

SEF058Y

EC-468

DTC P0550 PSP SENSOR

2006 Pathfinder

Wiring Diagram

UBS00KB8

BBWA1757E

DTC P0550 PSP SENSOR

EC-469

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2006 Pathfinder

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

UBS00KB9

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

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

EC-151, "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

P

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

Sensor ground

[Engine is running]

Warm-up condition

Idle speed

Approximately 0V

68

G

Sensor power supply
(Power steering pressure 
sensor)

[Ignition switch: ON]

Approximately 5V

BBIA0539E

EC-470

DTC P0550 PSP SENSOR

2006 Pathfinder

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 3 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 1 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.

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-471, "Component Inspection"

 .

OK or NG

OK

>> GO TO 6.

NG

>> Replace PSP sensor.

BBIA0552E

Voltage: Approximately 5V

PBIB1872E

Continuity should exist.

Continuity should exist.

DTC P0550 PSP SENSOR

EC-471

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2006 Pathfinder

6. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

UBS00KBA

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

UBS00KBB

POWER STEERING PRESSURE SENSOR

Refer to 

PS-24, "HYDRAULIC LINE"

 .

Condition

Voltage

Steering wheel: being turned

0.5 - 4.5V

Steering wheel: not being turned

0.4 - 0.8V

MBIB0126E

EC-472

DTC P0603 ECM POWER SUPPLY

2006 Pathfinder

DTC P0603 ECM POWER SUPPLY

PFP:23710

Component Description

UBS00KBO

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

UBS00KBP

DTC Confirmation Procedure

UBS00KBQ

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 4 times.

6.

If 1st trip DTC is detected, go to 

EC-474, "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
[ECM power supply (back-up) circuit is 
open or shorted.]

ECM

SEF058Y

DTC P0603 ECM POWER SUPPLY

EC-473

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2006 Pathfinder

Wiring Diagram

UBS00KBR

BBWA1758E

EC-474

DTC P0603 ECM POWER SUPPLY

2006 Pathfinder

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

UBS00KBS

1. 

CHECK ECM POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check voltage between ECM terminal 121 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2. 

DETECT MALFUNCTIONING PART

Check the following.

20A fuse

IPDM E/R harness connector E121

Harness for open or short between ECM and battery

>> Repair open circuit in harness or connectors.

3. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace harness or connectors.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

121

R/B

Power supply for ECM 
(Back-up)

[Ignition switch: OFF]

BATTERY VOLTAGE
(11 - 14V)

Voltage: Battery voltage

MBIB0026E

 

 

 

 

 

 

 

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