Nissan Maxima. Manual - part 504

EC-500

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

FUEL PUMP

4. Check the voltage between ECM harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 2.

2.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II

Check the voltage between IPDM E/R harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 8.

3.

DETECT MALFUNCTIONING PART

Check the following.

• IPDM E/R harness connector F10

• Harness for open or short between IPDM E/R and ECM

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

4.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III

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

2. Check harness continuity between IPDM E/R harness connector and “fuel level sensor unit and fuel

pump” harness connector.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors B10, E29

• Harness for open or short between “fuel level sensor unit and fuel pump” and IPDM E/R

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

6.

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.

ECM

Voltage

+

–

Connector

Terminal

Connector

Terminal

F14

14

E10

112

Battery voltage

JMBIA1890ZZ

IPDM E/R

Ground

Voltage

Connector

Terminal

F10

77

Ground

Battery voltage

JMBIA1885ZZ

IPDM E/R

Fuel level sensor unit and fuel 

pump

Continuity

Connector

Terminal

Connector

Terminal

E18

13

B42

1

Existed

FUEL PUMP

EC-501

< 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

>> GO TO 7.

NO

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

7.

CHECK FUEL PUMP

Refer to 

EC-501, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace fuel pump. Refer to 

FL-6, "Removal and Installation"

.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-41, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-35, "Removal and Installation"

.

NO

>> Repair or replace harness or connectors.

Component Inspection

INFOID:0000000010095220

1.

CHECK FUEL PUMP

1. Turn ignition switch OFF.

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

3. Check resistance between “fuel level sensor unit and fuel pump”

terminals as per the following.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace “fuel level sensor unit and fuel pump” Refer to

FL-6, "Removal and Installation"

.

Fuel level sensor unit and fuel 

pump

Ground

Continuity

Connector

Terminal

B42

3

Ground

Existed

Terminals

Resistance

1 and 3

0.2 - 5.0 

Ω [at 25°C (77°F)]

SEC918C

EC-502

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

IGNITION SIGNAL

IGNITION SIGNAL

Description

INFOID:0000000010095221

The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns

ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil

secondary circuit.

Component Function Check

INFOID:0000000010095222

Regarding Wiring Diagram information, refer to 

EC-554, "Wiring Diagram"

.

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

>> Go to 

EC-502, "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

>> Go to 

EC-502, "Diagnosis Procedure"

.

3.

CHECK IGNITION SIGNAL FUNCTION

 Without CONSULT

1. Let engine idle.

2. Read the voltage signal between ECM harness connectors.

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-502, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010095223

Regarding Wiring Diagram information, refer to 

EC-554, "Wiring Diagram"

.

1.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I

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

ECM

Voltage signal

+

–

Connec-

tor

Terminal

Connec-

tor

Terminal

F14

9

E10

112

10

11

18

19

21

JMBIA1886GB

JMBIA0035GB

IGNITION SIGNAL

EC-503

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

2. Check the voltage between ECM harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Refer to 

EC-157, "Diagnosis Procedure"

.

2.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II

1. Turn ignition switch OFF.

2. Disconnect condenser harness connector.

3. Turn ignition switch ON.

4. Check the voltage between condenser harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector.

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

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

YES

>> Refer to 

EC-157, "Diagnosis Procedure"

.

NO

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

4.

CHECK CONDENSER GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Check the continuity between condenser 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

Refer to 

EC-506, "Component Inspection (Condenser)"

ECM

Voltage

Connector

+

–

Terminal

Terminal

E10

105

112

Battery voltage

JMBIA1887ZZ

Condenser

Ground

Voltage

Connector

Terminal

F26

1

Ground

Battery voltage

PBIB0624E

IPDM E/R

Condenser

Continuity

Connector

Terminal

Connector

Terminal

F10

49

F26

1

Existed

Condenser

Ground

Continuity

Connector

Terminal

F26

2

Ground

Existed