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Test FF, Inaccurate Fuel Indication - Full Not Indicated When Tank Is Full Or Empty Not Indicated When Tank Is Empty

  1. Checking Fuel Gauge Response: Disconnect negative battery cable. Lower fuel tank for access to fuel tank sending unit. Disconnect electrical connector at fuel tank sending unit.
  2. Install a 43-ohm resistor on fuel tank sending unit electrical connector. Reconnect negative battery cable. Turn ignition on, and note fuel gauge reading. Fuel gauge should have 3 to 4 bars illuminated. Fuel remaining should read 3-4 gallons.
  3. If all readings are okay, turn ignition off, remove resistor and proceed to step 6). If readings are not correct, turn ignition off, leave resistor connected and proceed to step 4).
  4. Checking Harness Resistance: Disconnect negative battery cable. Remove instrument cluster. See INSTRUMENT CLUSTER R & I  . Measure resistance between instrument cluster connector C2-1, pin No. 2 (Yellow/White wire) and connector C2-1, pin No. 4 (Pink/Orange or Black/Light Blue wire) of wiring harness with 43-ohm resistor installed.
  5. If resistance is 42-45 ohms, replace instrument cluster. Install door pillar sticker to indicate instrument cluster has been replaced. If resistance is not 42-45 ohms, repair wiring circuit between instrument cluster and fuel tank sending unit.
  6. Checking Fuel Tank Sending Unit: Disconnect negative battery cable. Check fuel tank sending unit for binding, sticking or misalignment. If fuel tank sending unit is damaged, replace sending unit. If fuel tank sending unit is okay, proceed to step 7).
  7. Checking Fuel Tank: Check fuel tank for dents, improper installation of filler tube or other causes of improper fuel tank sending unit operation. If components are defective, replace as necessary. If components are okay, fault is caused by another system on vehicle.
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