Nissan Frontier. Manual — part 563

P0550 PSP SENSOR

EC-823

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

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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 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 72.

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 65 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-823, "Component Inspection"

.

OK or NG

OK

>> GO TO 6.

NG

>> Replace PSP sensor. Refer to

ST-20, "Removal and Installation"

.

6.

CHECK INTERMITTENT INCIDENT

Refer to

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009481495

POWER STEERING PRESSURE SENSOR

1. Reconnect all harness connectors disconnected.
2. Start engine and let it idle.

BBIA0552E

Voltage: Approximately 5V

Continuity should exist.

Continuity should exist.

EC-824

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

P0550 PSP SENSOR

3. Check voltage between ECM terminal 65 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

P0603 ECM POWER SUPPLY

EC-825

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

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P0603 ECM POWER SUPPLY

Component Description

INFOID:0000000009481496

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:0000000009481497

DTC Confirmation Procedure

INFOID:0000000009481498

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-825, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009481499

1.

CHECK ECM POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check voltage between ECM terminal 26 and ground with CONSULT or tester.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.

• 20A fuse (No.53)

• IPDM E/R harness connector E121

• Harness for open or short between ECM and battery

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

EC-826

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

P0603 ECM POWER SUPPLY

>> Repair open circuit in harness or connectors.

3.

CHECK INTERMITTENT INCIDENT

Refer to

GI-42, "Intermittent Incident"

.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace harness or connectors.

4.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn ignition switch ON.

2. Select “SELF DIAG RESULTS” mode with CONSULT.

3. Touch “ERASE”.

4. Perform DTC Confirmation Procedure.

See

EC-825, "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-825, "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

CAUTION:

Perform Additional Service When Replacing ECM. Refer to

EC-588, "Additional Service When Replac-

ing ECM"

.

Replace ECM.

>> INSPECTION END