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Home >> Chevrolet >> 2017 >> City Express LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.0L >> Diagnostic Information And Procedures >> DTC P0441 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the Q 12 EVAP Purge Solenoid Valve.
  2. Ignition ON, verify a test lamp illuminates between the ignition voltage circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance.
    • If the circuit tests normal and the ignition voltage circuit fuse is open, test all components connected to the ignition voltage circuit and replace as necessary.
    • If test lamp illuminates.
  3. Ignition OFF, connect a test lamp between the control circuit terminal 1 and the ignition voltage circuit terminal 2.
  4. Engine running, command the Q 12 EVAP Purge Solenoid Valve to Increase and Decrease with a scan tool. The test lamp should blink ON and OFF when activated.
    • If the test lamp is always ON, test the control circuit for a short to ground.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance.
    • If the test lamp blinks on and off.
  5. Connect a vacuum gauge to the purge port of the Q 12 EVAP Purge Solenoid Valve.
  6. Engine running, verify the vacuum gauge is at zero.
    • If greater than the specified range, replace the Q 12 EVAP Purge Solenoid Valve.
    • If vacuum gauge is at zero.
  7. Command the Q 12 EVAP Purge Solenoid Valve to Increase with the scan tool. Verify the vacuum gauge reads manifold vacuum when the solenoid is activated.
    • If the vacuum pressure is less than the specified range, replace the Q 12 EVAP Purge Solenoid Valve.
    • If vacuum gauge reads manifold vacuum.
  8. Test for the following conditions:
    • DTC P0456 was also set - Refer to DTC P0456 .
    • A blockage or restriction in the purge line between the purge solenoid and the EVAP canister
    • A faulty EVAP canister.
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