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Home >> Buick >> 2009 >> Allure CX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.8L - DTC P2430 To DTC U0107 >> DTC U0107 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the throttle body harness connector.
  2. Ignition OFF, test for 0 volts between the TAC module ignition 1 voltage circuit terminal 18 and ground.
    • If greater than the specified range, repair the short to battery voltage.
  3. Ignition ON, test for B+ between the TAC module ignition 1 voltage circuit terminal 18 and ground.
    • If less than the specified range, repair the short to ground, open circuit, or high resistance condition.
  4. Ignition OFF, test for less than 5 ohms between the TAC module ground circuits terminal 8 and terminal 17 and ground.
    • If greater than the specified range, test the ground circuits for an open/high resistance.
  5. Ignition ON, test for 2-5 volts between the TAC module serial data circuits terminal 7 and terminal 16 and ground.
    • If greater than the specified range, test the serial data circuit for a short to voltage. If the circuit tests normal, replace the PCM.
    • If less than the specified range, test the serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the PCM.
  6. If all circuits test normal, replace the throttle body assembly.
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