Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM-ENGINE CONTROL SYSTEM- ".

1. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
   1. Turn ignition switch OFF.
   2. Disconnect ECM harness connector.
   3. Turn ignition switch ON.
   4. Check the voltage between ECM harness connector and ground.
      CONNECTOR TERMINAL VOLTAGE CHART
      
      

      ECM				Voltage
      +		-
      Connector	Terminal	Connector	Terminal
      F14	14	E10	112	Battery voltage

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: GO TO  2.

      Fig 1: Checking Voltage Between ECM Harness Connector And Ground

      Courtesy of NISSAN MOTOR CO., U.S.A.
2. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II

   Check the voltage between IPDM E/R harness connector and ground.

   CONNECTOR TERMINAL VOLTAGE CHART
   
   

   IPDM E/R		Ground	Voltage
   Connector	Terminal
   F10	77	Ground	Battery voltage

   Is the inspection result normal? 

   YES: GO TO  3.

   NO: GO TO  8.

   Fig 2: Checking Voltage Between IPDM E/R Harness Connector And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
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.
      CONNECTOR TERMINAL CONTINUITY CHART
      
      

      IPDM E/R		Fuel level sensor unit and fuel pump		Continuity
      Connector	Terminal	Connector	Terminal
      E18	13	B42	1	Existed

      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.
      CONNECTOR TERMINAL CONTINUITY CHART
      
      

      Fuel level sensor unit and fuel pump		Ground	Continuity
      Connector	Terminal
      B42	3	Ground	Existed

      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 "COMPONENT INSPECTION ".

   Is the inspection result normal? 

   YES: GO TO  8.

   NO: Replace fuel pump.

8. CHECK INTERMITTENT INCIDENT

   Refer to INTERMITTENT INCIDENT .

   Is the inspection result normal? 

   YES: Replace IPDM E/R.

   NO: Repair or replace harness or connectors.