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Home >> GMC >> 2020 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 1.5L (LYX) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P0443, P0458, or P0459 >> Component Testing

Component Testing

WARNING: This page is about a different variant/trim than selected.

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 terminal 2/B and the ignition circuit terminal 1/A.
    • 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 terminal 1/A and 12 V. Install a jumper wire between the control terminal 2/B and ground.
  3. Verify the 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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