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Home >> Buick >> 2002 >> Regal LS >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P1640: Output Driver Module Circuit No. 1 >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS . After performing Diagnostic System Check - Engine Controls, go to next step.
  2. Is DTC P0560 set? If yes, see DTC P0560: SYSTEM VOLTAGE . If no, go to next step.
  3. Using scan tool, select OUTPUT DRIVER DATA list. Observe parameters on scan tool. Do any parameters indicate a fault present? If yes, go to next step. If no, go to step  5.
  4. Check for short to voltage on control circuit of component that indicated a fault. Did you find and correct the condition? If yes, go to step  6. If no, go to next step.
  5. Replace PCM. Program replacement PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  6. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within Conditions for Running DTC. Does DTC run and pass? If yes, go to next step. If no, go to step  2.
  7. Using scan tool, observe stored information. Does scan tool displays any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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