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Tachometer Inoperative (Ranger)

  1. Turn ignition off. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Measure resistance between ground and instrument cluster connector C215, terminal No. 2 (Black/White 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/White wire between instrument cluster connector and ground and retest system.
  2. Disconnect negative battery cable and Powertrain Control Module (PCM). 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 . If resistance is less than 5 ohms, remove breakout box. Reconnect PCM and negative battery cable and go to next step. If resistance is more than 5 ohms, repair open in Tan/Yellow wire between instrument cluster connector and PCM and retest system.
  3. Start engine and allow to idle. Measure voltage between ground and instrument cluster connector C214, terminal No. 15 (Tan/Yellow wire). If voltage is 5-8 volts, go to next step. If voltage is not 5-8 volts, temporally substitute a known good PCM and retest system.
  4. Measure resistance of printed circuit between tachometer pins (in center of clips) and corresponding instrument cluster connector C214, terminals No. 13 and 15 and connector C215, terminal No. 2. If all resistances are less than 5 ohms, replace tachometer and retest system. See GAUGES  under REMOVAL & INSTALLATION. If any resistance is more than 5 ohms, replace instrument cluster printed circuit. See PRINTED CIRCUIT (RANGER)  under REMOVAL & INSTALLATION.
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