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Test C: Fuel Gauge Inaccurate

  1. Test fuel gauge, see FUEL GAUGE under COMPONENT TESTING  . If fuel gauge tests okay, go to next step. If fuel gauge is faulty, replace fuel gauge and indicator module. Retest system.
  2. Test fuel sending unit, see FUEL SENDING UNIT  under COMPONENT TESTING. If fuel sending unit tests okay, go to next step. If fuel sending unit is faulty, replace fuel sending unit. Retest system.
  3. Disconnect fuel sending unit connector. Measure resistance between ground and fuel sending unit connector Black wire. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Black wire. Retest system.
  4. Disconnect instrument cluster connector C270. Measure resistance of Blue/Red wire between instrument cluster connector C270 terminal No. 3 and fuel sending unit connector. See Figure - Figure . If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Blue/Red wire. Retest system.
  5. Measure resistance between ground and instrument cluster connector C270 terminal No. 3 (Blue/Red wire). If resistance is more than 10 k/ohms, go to next step. If resistance is less than 10 k/ohms, repair short to ground in Blue/Red wire. Retest system.
  6. Disconnect instrument cluster connectors C270 and C268. Measure resistance between instrument cluster and fuel gauge or indicator module as indicated. See PRINTED CIRCUIT TEST POINTS  table. If resistance in all measurements are 5 ohms or less, replace fuel pump indicator module. Retest system. If resistance of any measurement is more than 5 ohms, replace instrument cluster printed circuit and retest. See PRINTED CIRCUIT  under REMOVAL & INSTALLATION.
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