Low-Fuel Warning Lamp

WARNING: This page is about a different car, the 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

Depending on vehicle posture or driving circumstance, the fuel level in the tank varies, and the warning lamp ON timing may be changed.

CHECK SELF-DIAGNOSIS
Preform the combination meter self-diagnosis mode. Refer to "METER/GAUGES OPERATION, ODO/TRIP METER, A/T INDICATOR AND ICC SYSTEM DISPLAY ".

OK or NG

OK >> GO TO 2.

NG >> Replace combination meter.
CHECK HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Check combination meter, fuel level sensor unit and terminals (meter-side, module-side, lead-side, and harness-side) for poor connection and bend.
OK or NG

OK >> GO TO 3.

NG >> Repair terminal or connector.
CHECK HARNESS CONNECTOR OUTPUT SIGNAL
1. Disconnect fuel level sensor connector.
2. Turn ignition switch ON.
3. Check voltage between combination meter harness connector M41 terminal 30 (R/Y) and ground.
Approx. 5V

Fig 1: Checking Low-Fuel Warning Lamp Harness Connector Output Signal
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK >> GO TO 4.

NG >> Replace combination meter.
CHECK HARNESS FOR OPEN OR SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect combination meter connector.
3. Check the following.
  - Continuity between combination meter harness connector M41 terminal 30 (R/Y) and fuel level sensor unit harness connector B51 terminal 5 (R/Y)
    1. Continuity should exist.
  - Continuity between combination meter harness connector M41 terminal 30 (R/Y) and ground
    1. Continuity should not exist.
Fig 2: Checking Low-Fuel Warning Lamp Harness For Open Or Short Circuit
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK >> GO TO 5.

NG >> Repair harness or connector.
CHECK FUEL LEVEL SENSOR GROUND CIRCUIT
Check the following.
- Continuity between combination meter harness connector M41 terminal 31 (B/Y) and fuel level sensor unit harness connector B51 terminal 6 (B)
  1. Continuity should exist.
- Continuity between combination meter harness connector M41 terminal 31 (B/Y) and ground.
  1. Continuity should not exist.
Fig 3: Checking Fuel Level Sensor Ground Circuit
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK >> GO TO 6.

NG >> Repair harness or connector.
CHECK FUEL LEVEL SENSOR UNIT
Check the components. Refer to "CHECK FUEL LEVEL SENSOR UNIT ".

OK or NG

OK >> GO TO 7.

NG >> Replace fuel level sensor unit.
CHECK INSTALLATION CONDITION
Check fuel level sensor unit installation, and check whether the float arm interferes or binds with any components inside the arm.

OK or NG

OK >> Replace combination meter.

NG >> Install fuel level sensor unit properly.