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Home >> Buick >> 2006 >> Allure CX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 3.8L - DTC P0451 To DTC P2120 >> DTC P1640, P1650 or P1660 >> Circuit/System Testing

Circuit/System Testing

  1. Observe the scantool for any other DTCs.
    • If DTC P0560 is also set, refer to DTC P0560 to repair the charging system.
  2. Observe the Observe the Output Driver Status with a scantool.
    • If any parameter does NOT indicate OK, test for a short to voltage on the control circuit of the component that indicated a fault.
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