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Test 8A - Repairing Fuel Gauge Warning Lamp

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For wiring diagrams, see WIRING DIAGRAMS  . Perform TEST VER-1 after each repair.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting any module connector.
  1. Ensure fuel tank is not empty. Check if fuel gauge indicates full all the time. If fuel gauge does not indicate full all the time, go to TEST 8B. If fuel gauge indicates full all the time, go to next step.
  2. Start engine. Using DRB, read body computer trouble codes. If DRB displays FUEL LEVEL SENDING UNIT, go to TEST 8B. If DRB does not display FUEL LEVEL SENDING UNIT, go to next step.
  3. Turn ignition switch to OFF position. Access fuel pump connector. Connector is located on top of fuel tank and is accessible by removing access cover in floor of trunk. Disconnect fuel pump connector. Turn ignition switch to ON position. Go to next step.
  4. Using DRB, read fuel level sensor voltage. If voltage is more than 9 volts, replace fuel tank sending unit. If voltage is less than 9 volts, turn ignition switch to OFF position. Go to next step.
  5. Disconnect Body Control Module (BCM) Gray connector. BCM is located behind right kick panel. Using DRB in ohmmeter mode, check resistance on BCM Gray connector terminal No. 23 (Dark Blue wire). If resistance is more than 5 ohms, replace BCM. If resistance is less than 5 ohms, go to next step.
  6. If vehicle is equipped with Flexible Fuel Module (FFM), go to next step. FFM is located in trunk behind trunk liner on rear passenger seat lower crossmember. If vehicle is not equipped with FFM, repair short to ground in Dark Blue wire.
  7. Disconnect FFM connector. Using DRB in ohmmeter mode, check resistance of BCM connector terminal No. 23 (Dark Blue wire). If resistance is less than 5 ohms, repair short to ground in Dark Blue wire. If resistance is more than 5 ohms, go to next step.
  8. Check resistance of FFM connector terminal No. 3 (Light Blue/Black wire). If resistance is less than 5 ohms, repair short to ground in Light Blue/Black wire. If resistance is more than 5 ohms, replace FFM.
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