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Test B: Fuel Gauge Inaccurate

  1. Turn ignition switch to LOCK position. Disconnect fuel sending unit harness connector C343. Connect Rotunda Instrument Gauge Tester (014-R1063) test leads to ground and terminal No. 5 (Blue/Red wire) at fuel sending unit harness connector C343. Set tester to 160 ohms. Turn ignition switch to RUN position. Turn tester on and wait one minute. Fuel gauge should read full or above. Turn ignition switch to LOCK position. Set tester to 15 ohms. Turn ignition switch to RUN position and wait one minute. Fuel gauge should read empty or below. If fuel gauge reads as specified, go to next step. If fuel gauge does not read as specified, go to step  4.
  2. Visually inspect fuel tank for damage or deformation. Replace fuel tank as necessary. Retest system. If fuel tank is okay, go to next step.
  3. Visually inspect fuel pump for damage or connector problems. Inspect float and float rod for damage or float rod obstruction. If fuel pump and wiring is okay, replace fuel sending unit. Retest system. If fuel pump and wiring is damaged, repair as necessary.
  4. Turn ignition switch to LOCK position. Measure resistance between ground and terminal No. 6 (Black wire) at fuel sending unit harness connector C343. If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Black wire.
  5. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Disconnect instrument cluster harness connector C266a. Measure resistance of Blue/Red wire between terminal No. 3 at instrument cluster harness connector C266a and terminal No. 5 at fuel sending unit harness connector C343. See Figure. Resistance should be 5 ohms or less. Measure resistance between ground and terminal No. 3 (Blue/Red wire) at instrument cluster harness connector C266a. Resistance should be greater than 10 k/ohms. If resistances are as specified, go to next step. If either resistance is not as specified, repair open or short to ground in Blue/Red wire.
  6. Visually inspect instrument cluster printed circuit for damage, cracks or hot spots. Replace instrument cluster printed circuit as necessary and retest system. See PRINTED CIRCUIT  under REMOVAL & INSTALLATION. If printed circuit is okay, replace fuel gauge and fuel indicator module. See FUEL GAUGE  and FUEL INDICATOR MODULE  under REMOVAL & INSTALLATION.
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