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Fuel Gauge Circuit Test

  1. Turn ignition on. Using a DVOM, measure voltage between ground and terminal No. 41 of instrument cluster connector No. 3. See Figure . If battery voltage is present, go to step 3). If battery volta ge is not present, go to next step.
  2. Check for faulty fuse No. 4 (7.5-amp), located in passenger compartment fuse block. Also, check wiring harness between fuse and instrument cluster for an open or short. See WIRING DIAGRAMS  . Repair as necessary.
  3. Turn ignition off. Using a DVOM, check for continuity between ground and terminal No. 14 of instrument cluster connector No. 1. See Figure . If continuity is present, go to next step. If continuity is not present, repair appropriate Black wire for an open or poor connection.
  4. Turn ignition on. Using a fused jumper wire, ground fuel gauge terminal for less than 10 seconds. See Figure . Gauge should move smoothly to full scale ("F") position. Replace fuel gauge if it does not function as described. If gauge functions as described, go to next step.
  5. Turn ignition off. Using a DVOM, check for continuity between ground and fuel tank gauge unit terminal No. 4 (Black wire). If continuity is present, go to next step. If continuity is not present, repair Black wire for an open or poor connection.
  6. Check for faulty fuel gauge sending unit. See FUEL GAUGE SENDING UNIT  under COMPONENT TESTS. Replace if necessary. If fuel gauge sending unit tests okay, go to next step.
  7. Using a DVOM, check Red/Blue wire between terminal No. 11 of instrument cluster connector No. 1 and fuel tank gauge unit for an open or short. See Figure . Repair as necessary.
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