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Speed Sensor
- Jack up and support the front of vehicle. Push the voltmeter or test light positive probe into the Yellow/Black wire terminal at the control unit connector.
- Connect the negative probe to ground. Start engine. Place vehicle in second position (gear selector in 2 position) and accelerate slowly. Voltage should be as shown in table.
SPEED SENSOR VOLTAGE CHECK
| Application |
Speed |
Voltage |
| Man. Trans. |
Below 6 MPH |
Yes |
| Man. Trans. |
Above 12 MPH |
No |
| Auto. Trans. |
Below 11 MPH |
Yes |
| Auto. Trans. |
Above 16 MPH |
No |
- If voltmeter readings do not correspond to above MPH ranges, install a new speed sensor and retest. If there was no voltage during step 2), check for bad electrical connection, fuse or faulty speed sensor. Replace or repair as necessary and retest.