Nissan Pathfinder (2007 year). Manual - part 200

DTC P0550 PSP SENSOR

EC-467

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6. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-145, "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-468

DTC P0603 ECM POWER SUPPLY

2007 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-470, "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-469

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Wiring Diagram

UBS00KBR

BBWA1758E

EC-470

DTC P0603 ECM POWER SUPPLY

2007 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-145, "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

DTC P0603 ECM POWER SUPPLY

EC-471

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4. 

PERFORM DTC CONFIRMATION PROCEDURE

 With CONSULT-II

1.

Turn ignition switch ON.

2.

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

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

EC-468, "DTC Confirmation Procedure"

  .

5.

Is the 1st trip DTC P0603 displayed again?

 With GST

1.

Turn ignition switch ON.

2.

Select Service $04 with GST.

3.

Perform DTC Confirmation Procedure.
See 

EC-468, "DTC Confirmation Procedure"

  .

4.

Is the 1st trip DTC P0603 displayed again?

Yes or No

Yes

>> GO TO 5.

No

>> INSPECTION END

5. 

REPLACE ECM

1.

Replace ECM.

2.

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

BL-96, "ECM Re-communicating Function"

  .

3.

Perform 

EC-76, "VIN Registration"

  .

4.

Perform 

EC-77, "Accelerator Pedal Released Position Learning"

  .

5.

Perform 

EC-77, "Throttle Valve Closed Position Learning"

  .

6.

Perform 

EC-77, "Idle Air Volume Learning"

  .

>> INSPECTION END

EC-472

DTC P0605 ECM

2007 Pathfinder

DTC P0605 ECM

PFP:23710

Component Description

UBS00KBC

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

UBS00KBD

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

UBS00KBE

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 turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.

PROCEDURE FOR MALFUNCTION A

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

If 1st trip DTC is detected, go to 

EC-473, "Diagnostic Procedure"

.

 With GST

Follow the procedure “With CONSULT-II” above.

PBIB1164E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0605
0605

Engine control module

A)

ECM calculation function is malfunctioning.

●

ECM

B)

ECM EEP-ROM system is malfunctioning.

C)

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.

SEF058Y

DTC P0605 ECM

EC-473

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PROCEDURE FOR MALFUNCTION B

 With CONSULT-II

1.

Turn ignition switch ON and wait at least 1 second.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

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

4.

If 1st trip DTC is detected, go to 

EC-473, "Diagnostic Procedure"

.

 With GST

Follow the procedure “With CONSULT-II” above.

PROCEDURE FOR MALFUNCTION C

 With CONSULT-II

1.

Turn ignition switch ON and wait at least 1 second.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

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

4.

Repeat step 3 for 32 times.

5.

If 1st trip DTC is detected, go to 

EC-473, "Diagnostic Procedure"

.

 With GST

Follow the procedure “With CONSULT-II” above.

Diagnostic Procedure

UBS00KBF

1. 

INSPECTION START

 With CONSULT-II

1.

Turn ignition switch ON.

2.

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

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

EC-472, "DTC Confirmation Procedure"

  .

5.

Is the 1st trip DTC P0605 displayed again?

 With GST

1.

Turn ignition switch ON.

2.

Select Service $04 with GST.

3.

Perform DTC Confirmation Procedure.
See 

EC-472, "DTC Confirmation Procedure"

  .

4.

Is the 1st trip DTC P0605 displayed again?

Yes or No

Yes

>> GO TO 2.

No

>> INSPECTION END

SEF058Y

SEF058Y

EC-474

DTC P0605 ECM

2007 Pathfinder

2. 

REPLACE ECM

1.

Replace ECM.

2.

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

BL-96, "ECM Re-communicating Function"

  .

3.

Perform 

EC-76, "VIN Registration"

  .

4.

Perform 

EC-77, "Accelerator Pedal Released Position Learning"

  .

5.

Perform 

EC-77, "Throttle Valve Closed Position Learning"

  .

6.

Perform 

EC-77, "Idle Air Volume Learning"

  .

>> INSPECTION END