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Home >> Chevrolet >> 2017 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 81 (Engine Controls And Fuel - 1.6L (LWC) - DTC P0243 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0443, P0458, or P0459 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

Static Test

  1. Ignition OFF, disconnect the harness connector at the Q12 Evaporative Emission Purge Solenoid Valve.
  2. Test for 10-30 Ω between the control circuit terminal 1 and the ignition circuit terminal 2.
    • If not between 10-30 Ω 

      Replace the Q12 Evaporative Emission Purge Solenoid Valve.

    • Go to next step: If between 10-30 Ω 
  3. All OK.

Dynamic Test

  1. Ignition OFF, disconnect the harness connector at the Q12 Evaporative Emission Purge Solenoid Valve.
  2. Install a 3 A fused jumper wire between the ignition circuit terminal 2 and 12 V. Install a jumper wire between the control circuit terminal 1.
  3. Verify the Q12 Evaporative Emission Purge Solenoid Valve turns on & off/clicks and flows vacuum.
    • If it does not turn on & off/click or flow vacuum. 

      Replace the Q12 Evaporative Emission Purge Solenoid Valve.

    • Go to next step: If it does turn on & off/clicks and flows vacuum. 
  4. All OK
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