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Speedometer System Test

  1. If odometer does not operate, go to next step. If odometer operates, check trip meter operation. If trip meter does not operate, go to step 4). If trip meter operates, replace speedometer.
  2. Disconnect connector "C" from back of instrument cluster. See Figure. Raise and support vehicle with rear wheels off of ground. Turn ignition on. At harness side of connector "C", connect voltmeter between terminals No. 13 and 15. See Figure. Turn ignition on. Rotate drive shaft.
  3. If voltage alternates between zero and 11 or more volts for each revolution of drive shaft, replace circuit plate. See Figure or 31. If voltage does not alternate between zero and 11 or more volts, check VSS. See VEHICLE SPEED SENSOR (VSS) TEST  under COMPONENT TESTING. If VSS is okay, repair circuit between VSS and instrument cluster.
  4. Disconnect connector "C" from back of instrument cluster. See Figure. At harness side of connector "C", connect a jumper wire to terminal No. 1. See Figure. Connect other end of same jumper wire to corresponding terminal on instrument cluster side of connector "C".
  5. In the same manner, connect 3 other jumper wires between terminals No. 13, 15 and 23. This simulates an attached connector, but with only 4 wires connected.
  6. Raise and support vehicle with rear wheels off of ground. Turn ignition on. Connect voltmeter between terminals No. 13 and 15 of disconnected connector. Rotate drive shaft. If voltage alternates between zero and 11 or more volts for each revolution of drive shaft, replace speedometer. If voltage does not alternate between zero and 11 or more volts, replace circuit plate. See Figure.
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