Nissan Pathfinder. Instruction - part 532

EC-434

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

FUEL PUMP

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Repair open circuit or short to power in harness or connectors.

9.

CHECK FUEL PUMP GROUND CIRCUIT

1. Disconnect “fuel level sensor unit and fuel pump” harness connector.

2. Check the continuity between “fuel level sensor unit and fuel pump” harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Repair open circuit or short to power in harness or connectors.

10.

CHECK FUEL PUMP

Check fuel pump. Refer to 

EC-435, "Component Inspection (Fuel Pump)"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Replace fuel pump. Refer to 

FL-6, "Removal and Installation"

.

11.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to 

GI-49, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-32, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

Component Inspection (Fuel Pump)

INFOID:0000000009178365

1.

CHECK FUEL PUMP

1. Turn ignition switch OFF.

2. Disconnect “fuel level sensor unit (fuel pump)” harness connector.

3. Check resistance between “fuel level sensor unit (fuel pump)” terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace fuel level sensor unit, fuel filter and fuel pump assembly. Refer to 

FL-6, "Removal and

Installation"

.

Component Inspection (Condenser-2)

INFOID:0000000009178366

1.

CHECK CONDENSER-2

1. Turn ignition switch OFF.

2. Disconnect condenser-2 harness connector.

3. Check resistance between condenser-2 terminals as per the following.

IPDM E/R

Fuel level sensor unit and fuel 

pump

Continuity

Connector

Terminal

Connector

Terminal

E121

15

B72

6

Existed

Fuel level sensor unit and fuel 

pump

Ground

Continuity

Connector

Terminal

B72

4

Ground

Existed

Terminals

Resistance [at 25

°C (77°F)]

4 and 6

0.2 - 5.0 

Ω

FUEL PUMP

EC-435

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace condenser-2.

Terminals

Resistance

1 and 2

Above 1 M

Ω [at 25°C (77°F)]

EC-436

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

IGNITION SIGNAL

IGNITION SIGNAL

Component Function Check

INFOID:0000000009178367

1.

INSPECTION START

Turn ignition switch OFF, and restart engine.
Does the engine start?

YES-1 >> With CONSULT: GO TO 2.

YES-2 >> Without CONSULT: GO TO 3.

NO

>> Proceed to 

EC-437, "Diagnosis Procedure"

.

2.

CHECK IGNITION SIGNAL FUNCTION

With CONSULT

1. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT.

2. Check that each circuit produces a momentary engine speed drop.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-437, "Diagnosis Procedure"

.

3.

CHECK IGNITION SIGNAL FUNCTION

 Without CONSULT

1. Let engine idle.

2. Read the voltage signal between ECM harness connector terminals with an oscilloscope.

NOTE:
The pulse cycle changes depending on rpm at idle.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-437, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009178368

1.

CHECK ECM POWER SUPPLY

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

2. Check the voltage between ECM harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Refer to 

EC-173, "Diagnosis Procedure"

.

ECM

Voltage signal

+

–

Connector

Terminal

Connector

Terminal

F51

9

E16

128

10

11

13

14

15

JMBIA0035GB

ECM

Voltage

Connector

Terminal

Connector

Terminal

F51

31

E16

128

Battery voltage

IGNITION SIGNAL

EC-437

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

2.

CHECK CONDENSER-1 POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect condenser-1 harness connector.

3. Turn ignition switch ON.

4. Check the voltage between condenser-1 harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK CONDENSER-1 POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector.

3. Check the continuity between IPDM E/R harness connector and condenser-1 harness connector.

4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> Refer to 

EC-173, "Diagnosis Procedure"

.

NO

>> Repair open circuit, short to ground or short to power in harness or connectors.

4.

CHECK CONDENSER-1 GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check the continuity between condenser-1 harness connector and ground.

3. Also check harness for short to power.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair open circuit or short to power in harness or connectors.

5.

CHECK CONDENSER-1

Check condenser-1. Refer to 

EC-441, "Component Inspection (Condenser-1)"

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace condenser-1.

6.

CHECK IGNITION COIL POWER SUPPLY

1. Reconnect all harness connectors disconnected.

2. Disconnect ignition coil harness connector-1.

3. Turn ignition switch ON.

4. Check the voltage between ignition coil harness connector and ground.

Condenser-1

Ground

Voltage

Connector

Terminal

F21

1

Ground

Battery voltage

IPDM E/R

Condenser-1

Continuity

Connector

Terminal

Connector

Terminal

F19

55

F21

1

Existed

Condenser-1

Ground

Continuity

Connector

Terminal

F21

2

Ground

Existed