Diagnostic Procedure

CHECK OVERALL FUNCTION
1. Turn ignition switch ON.
2. Pinch fuel feed hose with two fingers.
  Fuel pressure pulsation should be felt on the fuel feed hose for 1 second after ignition switch is turned ON.
OK or NG
1. OK: INSPECTION END
2. NG: GO TO 2.
Fig 1: Identifying Fuel Pressure Pulsation
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Turn ignition switch ON.
4. Check voltage between ECM terminal 113 and ground with CONSULT-II or tester.
  
  Fig 2: Checking Voltage Between ECM Terminal 113 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Voltage: Battery voltage
OK or NG
1. OK: GO TO 5 .
2. NG: GO TO 3.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
1. Turn ignition switch ON.
2. Check voltage between IPDM E/R terminal 40 and ground with CONSULT-II or tester.
  
  Fig 3: Checking Voltage Between IPDM E/R Terminal 40 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Voltage: Battery voltage
OK or NG
1. OK: GO TO 4.
2. NG: GO TO 13 .
DETECT MALFUNCTIONING PART
Check the following.
- Harness for open or short between IPDM E/R and ECM
  1. Repair harness or connectors.
CHECK CONDENSER POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Disconnect condenser harness connector.
4. Turn ignition switch ON.
5. Check voltage between condenser terminal 1 and ground with CONSULT-II or tester.
  
  Fig 4: Checking Voltage Between Condenser Terminal 1 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. Voltage: Battery voltage should exist for 1 second after ignition switch is turned ON.
6. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 9 .
2. NG: GO TO 6.
CHECK 15A FUSE
1. Turn ignition switch OFF.
2. Disconnect 15A fuse.
3. Check 15A fuse.
OK or NG
1. OK: GO TO 7.
2. NG: Replace fuse.
CHECK CONDENSER POWER SUPPLY CIRCUIT-II
1. Disconnect IPDM E/R harness connector E124.
2. Check harness continuity between IPDM E/R terminal 39 and condenser terminal 1. Refer to WIRING DIAGRAM .
  1. Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 14 .
2. NG: GO TO 8.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B107, E139
- Harness for open or short between IPDM E/R and condenser
  1. Repair harness or connectors.
CHECK CONDENSER GROUND CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between condenser terminal 2 and ground. Refer to WIRING DIAGRAM .
  1. Continuity should exist.
2. Also check harness for short to power.
OK or NG
1. OK: GO TO 10.
2. NG: Repair open circuit or short to power in harness or connectors.
CHECK CONDENSER
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 11.
2. NG: Replace condenser.
CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect "fuel level sensor unit and fuel pump" harness connector.
  
  Fig 5: Disconnecting Fuel Level Sensor Unit And Fuel Pump Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 1 and harness connector B1 terminal 15, "fuel level sensor unit and fuel pump" terminal 3 and ground. Refer to WIRING DIAGRAM .
  1. Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 13 .
2. NG: GO TO 12.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B107, E139
- Harness connectors B149, E251
- Harness for open or short between IPDM E/R and "fuel level sensor unit and fuel pump"
- Harness for open or short between "fuel level sensor unit and fuel pump"and ground
  1. Repair harness or connectors.
CHECK FUEL PUMP
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 12 .
2. NG: Replace fuel level sensor unit and fuel pump.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

OK or NG
1. OK: Replace IPDM E/R.
2. NG: Repair or replace harness or connectors.