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Voltmeter Inaccurate

  1. Using voltmeter, verify battery voltage at output side of fuse No. 15. See Figure . If battery voltage is not present, go to next step. If battery voltage is present, replace fuse and retest system.
  2. Using voltmeter, verify battery voltage at input side of fuse No. 15. If battery voltage is present, replace fuse and retest system. If battery voltage is not present, repair supply circuit to fuse and retest system.
  3. Disconnect negative battery cable. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Disconnect instrument cluster connectors C1 and C2. See Figure and Figure . Reconnect negative battery cable and turn ignition switch to RUN position. Check for battery voltage at cluster connector C2, pin No. 4 (Red/Yellow wire). If battery voltage is present, go to next step. If battery voltage is not present, repair short or open in circuit No. 640 (Red/Yellow wire).
  4. Measure resistance from cluster connector C1, pin No. 2 (Gray/White wire) to ground. If resistance is less than one ohm, go to next step. If resistance is more than one ohm, repair open in circuit No. 932 (Gray/White wire) and retest system.
  5. Check resistance between ground and cluster connector C1, pin No. 5 (Gray/Black wire). If resistance is less than one ohm, repair circuit No. 679 (Gray/Black wire) for short and retest system. If resistance is more than one ohm, go to next step.
  6. Measure resistance between cluster connector C1, pin No. 5 (Gray/Black wire) and VSS connector circuit No. 679 (Gray/Black wire). If resistance is less than one ohm, go to next step. If resistance is more than one ohm, repair circuit No. 679 (Gray/Black wire) for open and retest system.
  7. Check resistance from ground to VSS connector circuit No. 676 (Pink/Orange wire). If resistance is less than one ohm, go to next step. If resistance is more than one ohm, repair circuit No. 676 (Pink/Orange wire) for open and retest system.
  8. Turn ignition switch to OFF position. Check continuity between cluster printed circuit connections and gauge. If there is continuity through instrument cluster printed circuit, replace instrument cluster and retest system. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. If continuity is not present, replace instrument cluster printed circuit and retest system. See PRINTED CIRCUIT  under REMOVAL & INSTALLATION.
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