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Home >> Pontiac >> 2007 >> Grand Prix Base >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Diagnostic Information and Procedures >> DTC P0608 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the throttle actuator control (TAC) module.
  2. Ignition ON, test for 8.5 V between the vehicle speed signal terminal 4 and ground.
    • If less than the specified value, test the vehicle speed signal circuit for a short to ground. If the circuit tests normal, replace the PCM/ECM.
    • If greater than the specified value, test the vehicle speed signal circuit for a short to voltage. If the circuit tests normal, replace the TAC module.
  3. If all circuits test normal, replace the PCM/ECM.
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