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Fuel Gauge Inaccurate

  1. Turn ignition on. Using Tech 1 scan tester, check for IPC diagnostic trouble codes. If Code 28 (fuel sender circuit) is displayed, go to next step. If Tech 1 does not display Code 28 (fuel sender circuit), go to step 5).
  2. Turn ignition off. Disconnect fuel tank sender connector at fuel tank. Connect jumper wire between connector terminals "B" (Purple wire) and "D" (Black wire). Turn ignition on.
  3. If fuel gauge does not read empty, go to next step. If fuel gauge reads empty, turn ignition off. Check Black wire and connectors for open circuit or high resistance. If circuit is okay, replace fuel tank sender.
  4. If fuel gauge does not read empty, turn ignition off. Disconnect IPC connector. Check Purple and Black wires for open circuit or high resistance. Also check IPC connector C2 for good terminal contact. If circuit is okay, replace IPC.
  5. If Tech 1 did not display Code 28 in step 1), turn ignition off. Disconnect fuel tank sender connector at fuel tank. Connect 2 Red wires from Tester (J 33431) to connector terminals "B" (Purple wire) and "D" (Black wire). Turn ignition on. Set tester resistance dials to zero ohms (empty), then to 90 ohms (full).
  6. If fuel gauge displays "E" at zero ohms and "F" at 90 ohms, check fuel tank sender connector for good terminal contact at terminals "B" (Purple wire) and "D" (Black wire). Also check fuel tank sender pigtail wiring for damage. If terminal contact and wiring are okay, replace fuel tank sender.
  7. If fuel gauge does not display "E" at zero ohms and "F" at 90 ohms, check fuel sender Purple and Black wires for short to ground, open circuit, or high resistance. Check fuel tank unit connector for good contact at terminals "B" (Purple wire) and "D" (Black wire). Check IPC connector C2 for good terminal contact at terminals E3 (Purple wire) and F9 (Black wire). If all circuits are okay, replace IPC.
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