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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 330 (Engine Controls - Self-Diagnostics - 3.0L) >> Diagnostic Tests >> DTC P0445: EVAP Purge Solenoid Control Circuit - Shorted >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS .
  2. Turn ignition on, with engine off. Command the EVAP purge solenoid to 50 percent and then to zero percent with a scan tool. Do you hear or feel a clicking from the EVAP purge solenoid when the solenoid is commanded to 50 percent? If yes, go to next step. If no, go to step  4.
  3. Review the Freeze Frame/Failure Records for this DTC. Turn ignition off for 30 seconds. Start engine. Operate vehicle within the Conditions for Running the DTC or as close to the Freeze Frame/Failure Records that you observed. See CONDITIONS FOR RUNNING DTC . Does the DTC fail this ignition? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect the EVAP purge solenoid. Turn ignition on, with engine off. Probe the control circuit of the EVAP purge solenoid with a test light that is connected to a good ground. Does the test light illuminate? If yes, go to next step. If no, go to step  6.
  5. Test the control circuit of the EVAP purge solenoid for a short to voltage. Did you find and correct the condition? If yes, go to step  10. If no, go to step  7.
  6. Inspect for an intermittent and for a poor connection at the EVAP purge solenoid. Did you find and correct the condition? If yes, go to step  10. If no, go to step  8.
  7. Inspect for an intermittent and for a poor connection at the control module. Did you find and correct the condition? If yes, go to step  10. If no, go to step  9.
  8. Replace EVAP purge solenoid. After replacing solenoid, go to step  10.
  9. Replace ECM. Perform ECM relearn procedures. See ENGINE CONTROL MODULE  under PROGRAMMING. After replacing ECM, go to next step.
  10. Clear the DTCs with a scan tool. Turn ignition off for 30 seconds. Start engine. Operate vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  11. Observe the Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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