Nissan Frontier D40. Manual - part 515

P0550 PSP SENSOR

EC-751

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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-III 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-752, "Component Inspection"

.

OK or NG

OK

>> GO TO 6.

NG

>> Replace PSP sensor.

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-46, "Intermittent Incident"

.

>> INSPECTION END

BBIA0552E

Voltage: Approximately 5V

PBIB1872E

Continuity should exist.

Continuity should exist.

EC-752

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P0550 PSP SENSOR

Component Inspection

INFOID:0000000005273731

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.

Condition

Voltage

Steering wheel: being turned

0.5 - 4.5V

Steering wheel: not being turned

0.4 - 0.8V

MBIB0126E

P0603 ECM POWER SUPPLY

EC-753

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P0603 ECM POWER SUPPLY

Component Description

INFOID:0000000005273732

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:0000000005273733

DTC Confirmation Procedure

INFOID:0000000005273734

1.

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next step.

a.

Turn ignition switch OFF and wait at least 10 seconds.

b.

Turn ignition switch ON.

c.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON, wait at least 10 seconds.

3.

Turn ignition switch OFF, wait at least 5 minutes.

4.

Turn ignition switch ON, wait at least 10 seconds.

5.

Repeat steps 2 to 3 for 5 times.

6.

Check 1st trip DTC.

7.

If 1st trip DTC is detected, go to 

EC-753, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005273735

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-III or tester.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

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

EC-754

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P0603 ECM POWER SUPPLY

Check the following.
• 20A 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.

3.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-46, "Intermittent Incident"

.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace harness or connectors.

4.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT-III

1.

Turn ignition switch ON.

2.

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

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

EC-753, "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-753, "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

SEC-7, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement"

.

3.

Perform 

EC-473, "VIN Registration"

.

4.

Perform 

EC-473, "Accelerator Pedal Released Position Learning"

.

5.

Perform 

EC-473, "Throttle Valve Closed Position Learning"

.

6.

Perform 

EC-473, "Idle Air Volume Learning"

.

>> INSPECTION END