Test F - Speedometer Inaccurate

1. Remove instrument cluster, leaving connectors attached. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Connect AC voltmeter to speedometer SP + and SP - terminals on back of speedometer. Drive vehicle at speeds specified in SPEEDOMETER INPUT SPECIFICATIONS in PINPOINT TEST G. If voltages are not about as specified, go to next step. If voltages are about as specified, replace speedometer.
2. Turn ignition off. Unplug 14-pin connector from instrument cluster. Measure resistance between harness connector pin No. 7 (Blue/White wire) and vehicle speed sensor. Measure resistance between harness connector pin No. 10 (Orange/Black wire) and Brown/Light Green wire at vehicle speed sensor, located at transmission. If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, repair appropriate wire.
3. Measure resistance between harness connector pin No. 7 (Blue/White wire) and ground. If resistance is less than 5 ohms, go to next step. If resistance is not less than 5 ohms, repair Black wire to ground.
4. Measure resistance between the following pairs of terminals:
   • Speedometer + terminal and instrument cluster pin No. 6A.
   • Speedometer SP + terminal and instrument cluster pin No. 7A.
   • Speedometer SP - terminal and instrument cluster pin No. 10A.
   • Speedometer SP - terminal and instrument cluster pin No. 9A.

If all measurements are less than 5 ohms, replace vehicle speed sensor. If any measurement is not less than 5 ohms, replace instrument cluster printed circuit.