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Speedometer/Odometer Malfunction
- Remove instrument panel. See INSTRUMENT PANEL under REMOVAL & INSTALLATION
. With ignition switch in OFF position, connect a voltmeter between "S" terminal and "G" terminal on speedometer (back of instrument cluster). Place voltmeter in AC volts position.
NOTE:
Instrument cluster connector C268 must remain connected.
- Drive vehicle and note speed to voltage readings. Compare noted readings to SPEED-TO-VOLTAGE COMPARISON
table. If voltage readings are correct, replace speedometer. If readings are not correct, go to next step.
SPEED-TO-VOLTAGE COMPARISON
| Speed - MPH (KM/H) |
Approximate Voltage |
| 0 (0) |
0 |
| 5 (8) |
0.5 |
| 10 (16) |
1.0 |
| 15 (24) |
1.6 |
| 20 (32) |
2.0 |
| 25 (40) |
2.4 |
| 30 (48) |
2.8 |
| 35 (56) |
3.1 |
| 40 (64) |
3.4 |
| 45 (72) |
3.6 |
| 50 (80) |
3.9 |
| 55 (88) |
4.2 |
| 60 (96) |
4.4 |
- With ignition switch in OFF position, ensure the 4 screws holding speedometer to instrument cluster printed circuit are securely fastened. Measure resistance between speedometer "S" terminal and instrument cluster connector C268, terminal No. 3 (Pink/Blue wire), speedometer "G" terminal and instrument cluster connector C268, terminal No. 5 (Black/Red wire), and speedometer "B" terminal and instrument cluster connector C268, terminal No. 2 (Blue wire). If resistances are less than 5 ohms, go to next step. If resistances are more than 5 ohms, replace instrument cluster printed circuit.
- With ignition switch in OFF position and instrument cluster still removed, disconnect instrument cluster connector C268 and Vehicle Speed Sensor (VSS) connector. Measure resistance of Pink/Blue wire between VSS and instrument cluster connector C268, terminal No. 3. Measure resistance of Pink/Blue wire between instrument cluster connector C268, terminal No. 3 and ground. Measure resistance of Black/Red wire between VSS and instrument cluster connector C268, terminal No. 5. If resistances are less than 5 ohms between instrument cluster and VSS, and more than 10 k/ohms between Pink/Blue wire at instrument cluster and ground, replace VSS. If resistances are more than 5 ohms between instrument cluster and VSS, and less than 10 k/ohms between Pink/Blue wire at instrument cluster and ground, service wire(s) in question.