Nissan Pathfinder. Manual - part 510

EC-346

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0524 ENGINE OIL PRESSURE

1. Turn ignition switch ON.

2. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

3. Start the engine and check that “EOP SENSOR” changes, according to engine speeds.

Without CONSULT

Check engine oil pressure. Refer to 

LU-8, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Proceed to 

EC-347, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009178253

1.

CHECK ENGINE OIL LEVEL

1. Turn ignition switch OFF.

2. Check engine oil level. Refer to 

LU-8, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

CHECK ENGINE OIL PRESSURE

With CONSULT

1. Turn ignition switch ON.

2. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

3. Start the engine and check that “EOP SENSOR” changes, according to engine speeds.

Without CONSULT

Check engine oil level. Refer to 

LU-8, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check oil pump. Refer to 

LU-12, "Removal and Installation"

.

3.

CHECK EOP SENSOR

Check EOP sensor. Refer to 

EC-348, "Component Inspection"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-49, "Intermittent Incident"

.

NO

>> Repair or replace error-detected parts.

4.

CHECK ENGINE OIL LEAKAGE

Check engine oil leakage. Refer to 

LU-6, "Lubrication Circuit"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

Monitor item

Condition

Value

(Approx.)

EOP SENSOR

• Engine oil temperature: 80

°C (176°F)

• Selector lever: P or N position
• Air conditioner switch: OFF
• No  load

Engine speed:
Idle

1,450 mV or more

Engine speed:
2,000 rpm

2,850 mV or more

Monitor item

Condition

Value

(Approx.)

EOP SENSOR

• Engine oil temperature: 80

°C (176°F)

• Selector lever: P or N position
• Air conditioner switch: OFF
• No  load

Engine speed:
Idle

1,450 mV or more

Engine speed:
2,000 rpm

2,850 mV or more

P0524 ENGINE OIL PRESSURE

EC-347

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

5.

CHECK CAUSE OF ENGINE OIL CONSUMPTION

Check the following item.

>> Repair or replace error-detected parts.

Component Inspection

INFOID:0000000009178254

1.

CHECK EOP SENSOR

1. Turn ignition switch OFF.

2. Disconnect EOP sensor harness connector.

3. Check resistance between EOP sensor connector terminals.

Is the inspection result normal? 

YES

>> INSPECTION END.

NO

>> Replace EOP sensor. Refer to 

EC-14, "ENGINE CONTROL SYSTEM : Component Parts Loca-

tion"

.

Step

Inspection item

Equipment

Standard

Reference

1

PCV  valve

EC-465, "Work Procedure"

2

Exhaust front tube

Visual

• No blocking
• No abnormal sounds

—

3

Oil  pump

LU-12, "Removal and Installation"

4

• Piston
• Piston  pin
• Piston ring

• Piston to piston pin oil clearance
• Piston ring side clearance
• Piston ring end gap

EM-121

5

Cylinder block

• Cylinder block top surface distortion
• Piston to cylinder bore clearance

EM-121

EOP sensor

Condition

Resistance

(k

Ω)

+

−

Terminal

1

2

None

4 – 10

3

2  –  8

2

1

4 – 10

3

1  –  3

3

1

2  –  8

2

1  –  3

EC-348

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0603 ECM POWER SUPPLY

P0603 ECM POWER SUPPLY

DTC Logic

INFOID:0000000009178255

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing the next test.

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.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON and wait at least 10 second.

2. Turn ignition switch OFF and wait at least 5 minutes.

3. Turn ignition switch ON, wait at least 10 seconds.

4. Repeat steps 2 and 3 for five times.

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

YES

>> Proceed to 

EC-349, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009178256

1.

CHECK ECM POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the voltage between ECM harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Perform the trouble diagnosis for power supply circuit.

2.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to 

GI-49, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

PERFORM DTC CONFIRMATION PROCEDURE

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)

ECM back up RAM system does not 
function properly.

• Harness or connectors

[ECM power supply (back up) circuit is 
open or shorted.]

• ECM

ECM

Voltage

+

–

Connector

Terminal

Connector

Terminal

F51

26

E16

128

Battery voltage

P0603 ECM POWER SUPPLY

EC-349

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

1. Turn ignition switch ON.

2. Erase DTC.

3. Perform DTC CONFIRMATION PROCEDURE.

See 

EC-349, "DTC Logic"

.

Is the 1st trip DTC P0603 displayed again?

YES

>> Replace ECM. Refer to 

EC-466, "Removal and Installation"

.

NO

>> INSPECTION END