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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Controls And Fuel - 2.5L (LCV) - 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: EVAP Purge Solenoid Valve - From 0 to 50% and back to 0%.

    Verify the scan tool parameter:

    • EVAP Purge Solenoid Valve Control Circuit High Voltage Test Status = Not Run or OK
    • EVAP Purge Solenoid Valve Control Circuit Low Voltage Test Status = Not Run or OK
    • EVAP Purge Solenoid Valve Control Circuit Open Test Status = Not Run or OK
    • 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: EVAP Purge Solenoid 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 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:
    • EVAP Purge Solenoid Valve Control Circuit High Voltage Test Status = Not Run or OK
    • EVAP Purge Solenoid Valve Control Circuit Low Voltage Test Status = Not Run or OK
    • EVAP Purge Solenoid Valve Control Circuit Open Test Status = Not Run or OK
    • Perform the action while monitoring the parameter:
    • Wiggle the harness and connector: Q12 Evaporative Emission 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.