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No Pointer Movement (No Speed PCI Bus Message Or Zero MPH PCI Bus Message)

  1. Check Powertrain Control Module (PCM) for DTCs. See SELF-DIAGNOSTICS - CARAVAN, TOWN & COUNTRY, & VOYAGER article in ENGINE PERFORMANCE. If any PCM DTCs are present, repair as necessary. If no DTCs are present, go to next step.
  2. Check the speed signal input into the PCM. The speed signal originates from one of the following sources:
    • A distance sensor for vehicles with 3 speed automatic transmission. Check continuity from distance sensor to PCM. If OK, repair wiring. See ENGINE PERFORMANCE in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
    • The TCM for vehicles with the 4 speed electronic transmissions. Check continuity from TCM to PCM. If OK, use a DRBIII® scan tool to check TCM. See appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS. Also, see ENGINE PERFORMANCE in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
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