Diagnostic Procedure

CHECK DTC WITH "UNIFIED METER AND A/C AMP."
Refer to "SELF-DIAGNOSTIC RESULTS ".

OK or NG
1. OK : GO TO 2.
2. NG : Go to "FUEL LEVEL SENSOR SIGNAL INSPECTION ".
CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Disconnect "fuel level sensor unit and fuel pump" harness connector.
2. Turn ignition switch ON.
  
  Fig 1: Disconnecting Fuel Level Sensor Unit And Fuel Pump Harness Connector
  Courtesy of NISSAN NORTH AMERICA, INC.
3. Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with CONSULT-II or tester.
  Voltage: Approximately 5V
  
  Fig 2: Checking Voltage Between Terminal No. 4 & Ground
  Courtesy of NISSAN NORTH AMERICA, INC.
OK or NG
1. OK : GO TO 4.
2. NG : GO TO 3.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M72, F102
- Harness connectors B1, M12
- Harness for open or short between ECM and "fuel level sensor unit and fuel pump"
  1. : Repair open circuit or short to ground or short to power in harness or connector.
CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect "unified meter and A/C amp." harness connector M49.
3. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 5 and "unified meter and A/C amp." terminal 36. Refer to WIRING DIAGRAM .
  Continuity should exist .
4. Also check harness for short to power.
OK or NG
1. OK : GO TO 6.
2. NG : GO TO 5.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B1, M12
- Harness for open or short between "fuel level sensor unit and fuel pump" and "unified meter and A/C amp."
  1. : Repair open circuit or short to ground or short to power in harness or connector.
CHECK FUEL TANK TEMPERATURE SENSOR
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK : GO TO 7.
2. NG : Replace fuel level sensor unit.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. : INSPECTION END