Diagnosis Procedure

CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connections M16, M70. Refer to "GROUND INSPECTION ".
  Is the inspection result normal?
  
  YES: GO TO 2.
  
  NO: Repair or replace ground connections.

CHECK FPCM POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect fuel pump control module (FPCM) harness connector.
Turn ignition switch ON.

Check the voltage between FPCM harness connector and ground.

CONNECTOR TERMINAL VOLTAGE CHART

FPCM		Ground	Voltage
Connector	Terminal	Ground	Voltage
B111	2	Ground	Battery voltage

Fig 1: Checking Voltage Between FPCM Terminal 2 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

Is the inspection result normal?

YES: GO TO 4.

NO: GO TO 3.

DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B4, E106
- IPDM E/R harness connector E8
- 15 A fuse (No. 81)
- Harness for open or short between FPCM and IPDM E/R
  Repair open circuit, short to ground or short to power in harness or connectors.

CHECK FPCM GROUND CIRCUIT FOR OPEN AND SHORT-I

Turn ignition switch OFF.

Check the continuity between FPCM harness connector and ground.

CONNECTOR TERMINAL CONTINUITY CHART

FPCM		Ground	Continuity
Connector	Terminal	Ground	Continuity
B111	3	Ground	Existed

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.

CHECK FPCM GROUND CIRCUIT FOR OPEN AND SHORT-II

Disconnect "fuel level sensor unit and fuel pump" (main) harness connector.
Disconnect dropping resistor harness connector.

Check the continuity between "fuel level sensor unit and fuel pump" (main) harness connector or FPCM harness connector and dropping resistor harness connector.

CONNECTOR TERMINAL CONTINUITY CHART

Fuel level sensor unit and fuel pump (main)		Dropping resistor		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B433	3	B112	2	Existed
B111	4	B112	2	Existed

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

YES: GO TO 7.

NO: GO TO 6.

DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B65, B434
- Harness for open or short between "fuel level sensor unit and fuel pump" (main) and dropping resistor
- Harness for open or short between FPCM and dropping resistor
  Repair open circuit, short to ground or short to power in harness or connectors.

CHECK FPCM INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Disconnect ECM harness connector.

Check the continuity between FPCM harness connector and ECM harness connector.

CONNECTOR TERMINAL CONTINUITY CHART

FPCM		ECM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B111	4	F105	32	Existed

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

YES: GO TO 9.

NO: GO TO 8.

DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B2, M13
- Harness connectors F102, M72
- Harness for open or short between FPCM and ECM
  Repair open circuit, short to ground or short to power in harness or connectors.

CHECK FPCM OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Check the continuity between ECM and FPCM

CONNECTOR TERMINAL CONTINUITY CHART

ECM		FPCM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F105	14	B111	1	Existed

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

YES: GO TO 11.

NO: GO TO 10.

DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B2, M13
- Harness connectors F102, M72
- Harness for open or short between ECM and FPCM
  Repair open circuit, short to ground or short to power in harness or connectors.
CHECK FPCM
Refer to "COMPONENT INSPECTION ".

Is the inspection result normal?

YES: GO TO 12.

NO: Replace FPCM.
CHECK INTERMITTENT INCIDENT
Refer to "DESCRIPTION ".

INSPECTION END