Content .. 283 284 285 286 ..

Nissan Pathfinder (2009 year). Manual - part 285

EC-294

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0550 PSP SENSOR

P0550 PSP SENSOR

Component Description

INFOID:0000000004297493

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.

On Board Diagnosis Logic

INFOID:0000000004297494

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

EC-302

DTC Confirmation Procedure

INFOID:0000000004297495

If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

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

Check 1st trip DTC.

If 1st trip DTC is detected, go to

EC-294, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000004297496

CHECK GROUND CONNECTIONS

Turn ignition switch OFF.

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

EC-95, "Ground Inspection"

OK or NG

>> GO TO 2.

>> Repair or replace ground connections.

BBIA0552E

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

BBIA0539E

2009 Pathfinder

P0550 PSP SENSOR

EC-295

< COMPONENT DIAGNOSIS >

[VQ40DE]

CHECK PSP SENSOR POWER SUPPLY CIRCUIT

Disconnect power steering pressure (PSP) sensor harness con-
nector.

Turn ignition switch ON.

Check voltage between PSP sensor terminal 3 and ground with
CONSULT-III or tester.

OK or NG

>> GO TO 3.

>> Repair open circuit or short to ground or short to power

in harness or connectors.

CHECK PSP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.

Disconnect ECM harness connector.

Check harness continuity between PSP sensor terminal 1 and ECM terminal 67.
Refer to Wiring Diagram.

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 4.

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Check harness continuity between ECM terminal 12 and PSP sensor terminal 2.

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 5.

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK PSP SENSOR

Refer to

EC-296, "Component Inspection"

OK or NG

>> GO TO 6.

>> Replace PSP sensor.

CHECK INTERMITTENT INCIDENT

Refer to

GI-49, "Intermittent Incident"

>> INSPECTION END

BBIA0552E

Voltage: Approximately 5V

PBIB1872E

Continuity should exist.

2009 Pathfinder

EC-296

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0550 PSP SENSOR

Component Inspection

INFOID:0000000004297497

POWER STEERING PRESSURE SENSOR

Reconnect all harness connectors disconnected.

Start engine and let it idle.

Check voltage between ECM terminal 12 and ground under the
following conditions.

Condition

Voltage

Steering wheel: being turned

0.5 - 4.5V

Steering wheel: not being turned

0.4 - 0.8V

MBIB0126E

2009 Pathfinder

P0603 ECM POWER SUPPLY

EC-297

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0603 ECM POWER SUPPLY

Component Description

INFOID:0000000004297498

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

INFOID:0000000004297499

DTC Confirmation Procedure

INFOID:0000000004297500

If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

Start engine and let it idle for 1 second.

Turn ignition switch OFF, wait at least 10 seconds, and then turn it ON.

Repeat steps 2 and 3 for 4 times.

Check 1st trip DTC.

If 1st trip DTC is detected, go to

EC-297, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000004297501

CHECK ECM POWER SUPPLY

Turn ignition switch OFF.

Disconnect ECM harness connector.

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

OK or NG

>> GO TO 3.

>> GO TO 2.

DETECT MALFUNCTIONING PART

Check the following.

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

Voltage: Battery voltage

MBIB0026E

2009 Pathfinder

EC-298

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0603 ECM POWER SUPPLY

• 20 A fuse(No.53)
• IPDM E/R harness connector E121
• Harness for open or short between ECM and battery

>> Repair open circuit in harness or connectors.

CHECK INTERMITTENT INCIDENT

Refer to

GI-49, "Intermittent Incident"

OK or NG

>> GO TO 4.

>> Repair or replace harness or connectors.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT-III

Turn ignition switch ON.

Select “SELF DIAG RESULTS” mode with CONSULT-III.

Touch “ERASE”.

Perform DTC Confirmation Procedure.
See

EC-297, "DTC Confirmation Procedure"

Is the 1st trip DTC P0603 displayed again?

With GST

Turn ignition switch ON.

Select Service $04 with GST.

Perform DTC Confirmation Procedure.
See

EC-297, "DTC Confirmation Procedure"

Is the 1st trip DTC P0603 displayed again?

Yes or No

Yes

>> GO TO 5.

>> INSPECTION END

REPLACE ECM

Replace ECM.

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

SEC-8, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement"

(with Intelligent Key system) or

SEC-124, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT

: Special Repair Requirement"

(without Intelligent Key system).

Perform

EC-25, "VIN Registration"

Perform

EC-25, "Accelerator Pedal Released Position Learning"

Perform

EC-25, "Throttle Valve Closed Position Learning"

Perform

EC-25, "Idle Air Volume Learning"

>> INSPECTION END

2009 Pathfinder

P0605 ECM

EC-299

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0605 ECM

Component Description

INFOID:0000000004297502

The ECM consists of a microcomputer and connectors for signal
input and output and for power supply. The ECM controls the engine.

On Board Diagnosis Logic

INFOID:0000000004297503

This self-diagnosis has one or two trip detection logic.

FAIL-SAFE MODE

ECM enters fail-safe mode when the malfunction A is detected.

DTC Confirmation Procedure

INFOID:0000000004297504

Perform PROCEDURE FOR MALFUNCTION A first. If the 1st trip DTC cannot be confirmed, perform
PROCEDURE FOR MALFUNCTION B. If there is no malfunction on PROCEDURE FOR MALFUNCTION
B, perform PROCEDURE FOR MALFUNCTION C.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
1.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

PROCEDURE FOR MALFUNCTION A

Turn ignition switch ON.

Check 1st trip DTC.

If 1st trip DTC is detected, go to

EC-300, "Diagnosis Procedure"

PROCEDURE FOR MALFUNCTION B

With CONSULT-III

Turn ignition switch ON and wait at least 1 second.

Check 1st trip DTC.

If 1st trip DTC is detected, go to

EC-300, "Diagnosis Procedure"

PROCEDURE FOR MALFUNCTION C

With CONSULT-III

Turn ignition switch ON and wait at least 1 second.

PBIB1164E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0605
0605

Engine control module

ECM calculation function is malfunctioning.

• ECM

ECM EEP-ROM system is malfunctioning.

ECM self shut-off function is malfunctioning.

Detected items

Engine operation condition in fail-safe mode

Malfunction A

• ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5

degrees) by the return spring.

• ECM deactivates ASCD operation.

2009 Pathfinder

EC-300

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0605 ECM

Turn ignition switch OFF, wait at least 10 seconds, and then turn it ON.

Repeat step 2 for 32 times.

Check 1st trip DTC.

If 1st trip DTC is detected, go to

EC-300, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000004297505

INSPECTION START

With CONSULT-III

Turn ignition switch ON.

Select “SELF DIAG RESULTS” mode with CONSULT-III.

Touch “ERASE”.

Perform DTC Confirmation Procedure.
See

EC-299, "DTC Confirmation Procedure"

Is the 1st trip DTC P0605 displayed again?

With GST

Turn ignition switch ON.

Select Service $04 with GST.

Perform DTC Confirmation Procedure.
See

EC-299, "DTC Confirmation Procedure"

Is the 1st trip DTC P0605 displayed again?

Yes or No

Yes

>> GO TO 2.

>> INSPECTION END

REPLACE ECM

Replace ECM.

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

SEC-8, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement"

(with Intelligent Key system) or

SEC-124, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT

: Special Repair Requirement"

(without Intelligent Key system).

Perform

EC-25, "VIN Registration"

Perform

EC-25, "Accelerator Pedal Released Position Learning"

Perform

EC-25, "Throttle Valve Closed Position Learning"

Perform

EC-25, "Idle Air Volume Learning"

>> INSPECTION END

2009 Pathfinder

P0607 ECM

EC-301

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0607 ECM

Description

INFOID:0000000004297273

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.

On Board Diagnosis Logic

INFOID:0000000004297274

This self-diagnosis has the one trip detection logic.

DTC Confirmation Procedure

INFOID:0000000004297275

Turn ignition switch ON.

Check DTC.

If DTC is detected, go to

EC-301, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000004297276

INSPECTION START