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Home >> Chevrolet >> 2011 >> Corvette Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 6.2L Or 7.0L - DTC P0201 Through DTC P0651 >> DTC P0443 or P0449 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the EVAP canister purge or vent solenoid valve.
  2. Ignition ON, verify that a test lamp illuminates between the voltage supply circuit terminal A for purge or terminal B for vent and ground.
    • If the test lamp does not illuminate, test the voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal and the voltage supply circuit fuse is open, test or replace the EVAP canister purge or vent solenoid.
  3. Verify that a test lamp does not illuminate between the B+ or ignition circuit terminal A for purge or terminal B for vent and the control circuit terminal B for purge or terminal A for vent.
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
  4. Remove the test lamp.
  5. Ignition ON, command the canister purge or vent solenoid ON and OFF with a scan tool while observing the following control circuit status parameters. Each parameter should toggle between OK and Not Run or Not Run and OK.
    • EVAP Vent or Purge Sol Ckt. Short Gnd Test Status
    • EVAP Vent or Purge Sol Ckt. Open Test Status
    • EVAP Vent or Purge Sol Ckt. Short Volts Test Status
    • If not the specified value, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6. Install a 3 A fused jumper wire between the control circuit terminal B for purge or terminal A for vent and the B+ or ignition circuit terminal A for purge or terminal B for vent. Command the purge or vent solenoid ON with a scan tool. Verify the scan tool purge or vent solenoid Ckt. Short Volts Test Status Parameter is Fault.
    • If not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  7. If all circuits test normal, replace the appropriate purge or vent solenoid valve.
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