Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

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: Pinching Fuel Feed Hose
  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.
  1. Voltage: Battery voltage
OK or NG
1. OK: GO TO 5.
2. NG: GO TO 3.
  
  Fig 2: Checking Voltage
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector E122.
3. Turn ignition switch ON.
4. Check voltage between IPDM E/R terminal 46 and ground with CONSULT-II or tester.
  1. Voltage: Battery voltage
OK or NG
1. OK: GO TO 4.
2. NG: GO TO 12.
  
  Fig 3: Checking Voltage
  Courtesy of NISSAN MOTOR CO., U.S.A.
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
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Disconnect condenser harness connector.
4. Turn ignition switch ON.
  
  Fig 4: Locating Condenser 2
  Courtesy of NISSAN MOTOR CO., U.S.A.
5. Check voltage between condenser terminal 1 and ground with CONSULT-II or tester.
  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 8.
2. NG: GO TO 6.
  
  Fig 5: Checking Voltage
  Courtesy of NISSAN MOTOR CO., U.S.A.
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 FOR OPEN AND SHORT
1. Disconnect IPDM E/R harness connector E119.
2. Check harness continuity between IPDM E/R terminal 13 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 12.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK CONDENSER GROUND CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between condenser terminal 1 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 9.
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 10.
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.
3. Disconnect IPDM E/R harness connector E119.
4. Check harness continuity between IPDM E/R terminal 13 and "fuel level sensor unit and fuel pump" terminal 1, "fuel level sensor unit and fuel pump" terminal 3 and ground.
  Refer to WIRING DIAGRAM .
  1. Continuity should exist.
5. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 12.
2. NG: GO TO 11.
  
  Fig 6: Locating Fuel Level Sensor Unit And Fuel Pump Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E41, C1
- Harness for open or short between fuel pump and IPDM E/R
- Harness for open or short between fuel pump and ground
  1. : Repair open circuit or short to ground or short to power in harness or connectors.
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.