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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  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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