Tachometer Inoperative
- Turn ignition off. Remove instrument cluster. See appropriate INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Disconnect instrument cluster connector C216. Measure voltage 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. Retest system.
- Disconnect negative battery cable and Powertrain Control Module (PCM) connector. 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 . 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. Retest system.
- 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.
- 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, replace tachometer. See GAUGES under REMOVAL & INSTALLATION. If resistance in any circuit is 5 ohms or more, replace instrument cluster printed circuit. See PRINTED CIRCUIT under REMOVAL & INSTALLATION.
TACHOMETER PRINTED CIRCUIT MEASUREMENTS
| Connector/Terminal | Connector/Terminal No. |
|---|---|
| Speedometer/S | C214/15 |
| Speedometer/G | C215/2 |
| Speedometer/G (6-Cyl) | C216/8 |
| Speedometer/B | C214/13 |