Nissan Frontier. Manual - part 669

P0550 PSP SENSOR

EC-1247

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

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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 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-1248, "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

BBIA0552E

Voltage: Approximately 5V

PBIB1872E

Continuity should exist.

Continuity should exist.

EC-1248

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

P0550 PSP SENSOR

Component Inspection

INFOID:0000000009481895

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

EC-1249

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

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P0603 ECM

DTC Logic

INFOID:0000000010471251

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is 11 V or more with ignition

switch ON.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON and wait at least 1 second.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Repeat step 1 and 2 for 10 times.

4. Turn ignition switch ON.

5. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-1249, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010471252

1.

CHECK ECM POWER SUPPLY AND GROUND CIRCUIT

Perform trouble diagnosis for ECM power supply and ground circuit. Refer to 

EC-1091, "Diagnosis Proce-

dure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Erase DTC.

3. Perform DTC confirmation procedure. Refer to 

EC-1249, "DTC Logic"

.

Is the 1st trip DTC P0603 displayed again?

YES

>> Replace ECM. Refer to 

EC-1072, "Additional Service When Replacing ECM"

.

NO

>> INSPECTION END

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0603

ECM BACK UP CIRCUIT
[Internal control module keep 
alive memory (KAM) error]

• Malfunction in the internal back up RAM of ECM.
• Malfunction in the internal EEP-ROM system of 

ECM.

• ECM  power  supply
• ECM

EC-1250

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

P0604 ECM

P0604 ECM

DTC Logic

INFOID:0000000010471254

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is 11 V or more with ignition

switch ON.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON (engine stopped) and wait least 20 minutes.

CAUTION:

Never start engine during this procedure.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Turn ignition switch ON.

4. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-1250, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010471255

1.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Erase DTC.

3. Perform DTC confirmation procedure. Refer to 

EC-1250, "DTC Logic"

.

Is the 1st trip DTC P0604 displayed again?

YES

>> Replace ECM. Refer to 

EC-1072, "Additional Service When Replacing ECM"

.

NO

>> INSPECTION END

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0604

ECM
[Internal control module 
random access memory 
(RAM) error]

Malfunction in the internal RAM of ECM.

ECM