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Home >> Buick >> 2008 >> Allure CX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.8L - DTC P0385 To DTC P2108 >> DTC P1640, P1650, or P1660 >> Circuit/System Testing

Circuit/System Testing

  1. Observe the scan tool for any other DTCs.
  2. Observe the Output Driver Status with a scan tool.
    • If any parameter does NOT indicate OK, test for a short to voltage on the control circuit of the component that indicated a fault.