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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 72 (Engine Control System & Fuel System - 3.8L - DTC P2119 To DTC P2444 & DTC U0107) >> DTC U0107 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  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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