Vehicle Speed Sensor (Metro)
- Check speedometer operation. If speedometer operates correctly, proceed to step 2). Repair or replace speedometer if speedometer is not operating properly.
- Disconnect connectors C1 (right side) and C2 (left side) from instrument cluster. Using ohmmeter, measure resistance from Black/Blue wire of C1 connector and ground. If resistance is less than .3 ohms, proceed to step 3). If resistance is greater than .3 ohms, repair Black/Blue wire between instrument cluster and ground connection, located left of cigarette lighter and lower support on instrument panel.
- Turn ignition on. Using voltmeter, measure voltage from Yellow/Green wire of connector C2 to ground. If voltage is greater than 5 volts, proceed to step 6). If voltage is less than 5 volts, measure voltage at Yellow/Green wire of ECM. The ECM is located under left side of dash.
- If voltage is greater than 5 volts, repair open in Yellow/Green wire between ECM and instrument panel. If voltage is less than 5 volts, proceed to step 5).
- Turn ignition off. Disconnect 18-pin connector from ECM, located under left side of dash. Using ohmmeter, measure resistance from Yellow/Green wire of connector to ground. If continuity is present, repair short to ground in wiring between ECM and instrument cluster. If short is not present, replace ECM.
- Disconnect speedometer cable from speedometer. Connect ohmmeter across terminals No. 1 and 2 of vehicle speed sensor. See Fig 1 . Measure resistance while rotating speedometer head.
- If resistance drops to less than 5 ohms, 4 times per revolution, replace ECM. If resistance DOES NOT drops to less than 5 ohms, 4 times per revolution, replace speedometer.
NOTE:
Following procedure applies if Code 42 is stored in ECM memory or incorrect input from vehicle speed sensor is suspected.