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Test No. 7: Speedometer Does Not Operate While Driving

  1. Test drive and check odometer operation. If odometer is bad, go to next step. If odometer is okay, check trip meter operation. If trip meter is bad, go to step  4. If trip meter is okay, replace speedometer and retest.
  2. Disconnect instrument panel connector "C". Raise and support vehicle. Turn ignition on. Check voltage between connector "C" terminal No. 9 (Blue wire) and No. 10 (Purple/White wire). See Figure. Voltage should vary between zero volts and battery voltage while rotating driveshaft. If voltage is as specified, replace circuit plate and retest. If voltage is not as specified, go to next step.
  3. Check Vehicle Speed Sensor (VSS). See VEHICLE SPEED SENSOR (VSS)  under COMPONENT TESTS. If VSS is bad, replace VSS and retest. If VSS is okay, repair wiring between VSS and instrument panel.
  4. Remove instrument panel. Raise and support vehicle. Turn ignition on. Check VSS signal at instrument panel connector "D" terminal No. 4 (Pink wire) and connector "C" terminal No. 9 (Blue wire). See VEHICLE SPEED SENSOR (VSS)  under COMPONENT TESTS. Voltage should vary between zero volts and battery voltage while rotating driveshaft. If voltage is not as specified, replace circuit plate and retest. If voltage is as specified, replace speedometer and retest.
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