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Tachometer Reads Inaccurately

NOTE: If equipped with 4-cylinder engine, start at step 2).
  1. Turn ignition off. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Disconnect instrument cluster connector C216. Measure resistance between ground and instrument cluster connector C216 terminal No. 8 (Black/Yellow wire). See Figure . If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Black/Yellow wire between instrument cluster connector and ground and retest system.
  2. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Measure resistance of printed circuit between tachometer pins (in center of clips) and corresponding instrument cluster connectors. See TACHOMETER PRINTED CIRCUIT MEASUREMENTS table. If all resistance values are less than 5 ohms, go to next step. If resistance in any circuit is 5 ohms or more, replace instrument cluster printed circuit. See PRINTED CIRCUIT  under REMOVAL & INSTALLATION.
  3. Disconnect negative battery cable and Powertrain Control Module (PCM). PCM is located at right rear of engine compartment. Install EEC-V 104-Pin Breakout Box (014-00950) following manufacturer's instructions. Measure resistance between instrument cluster connector C214 terminal No. 15 (Tan/Yellow wire) and breakout box test pin No. 48. See Figure . Measure resistance between ground and breakout box test pin No. 48. If no continuity to ground exists and resistance is less than 5 ohms between PCM and instrument cluster connector, replace tachometer. If continuity to ground exists or resistance is 5 ohms or more between PCM and instrument cluster connector, replace PCM.
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