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Home >> Cadillac >> 2021 >> CT5 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls And Fuel - 3.0L (LGY) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P0443, P0458, or P0459 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition - On / Vehicle - In Service Mode
  2. Perform the scan tool control function: Evaporative Emission Canister Purge Valve - From 0 to 50% and back to 0%.

    Verify the scan tool parameter:

    • Evaporative Emission Canister Purge Valve Control Circuit High Test Status = Not Run or Okay
    • Evaporative Emission Canister Purge Valve Control Circuit Low Test Status = Not Run or Okay
    • Evaporative Emission Canister Purge Valve Control Circuit Open Test Status = Not Run or Okay
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  3. Perform the scan tool control function: Evaporative Emission Canister Purge Valve - From 0 to 50% and back to 0%.

    Verify a click can be heard or felt at the following component (s) when the scan tool control function was commanded: Q12 Evaporative Emission Canister Purge Solenoid Valve

    • If a click cannot be heard or felt 

      Refer to: Circuit/System Testing

    • Go to next step: If a click can be heard or felt 
  4. Verify the scan tool parameter:
    • Evaporative Emission Canister Purge Valve Control Circuit High Test Status = Not Run or Okay
    • Evaporative Emission Canister Purge Valve Control Circuit Low Test Status = Not Run or Okay
    • Evaporative Emission Canister Purge Valve Control Circuit Open Test Status = Not Run or Okay
    • Perform the action while monitoring the parameter:
    • Wiggle the harness and connector: Q12 Evaporative Emission Canister Purge Solenoid Valve
    • Wiggle the harness and connector: K20 Engine Control Module
    • If not the specified state 

      Repair as necessary - Wiring / Terminal (s) / Electrical Connector (s)

    • Go to next step: If the specified state 
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC is not set 
  6. All OK.
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