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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1645 (Engine Control System & Fuel System - 4.8L, 5.3L, 6.0L, 6.2L - DTC P0300 To DTC P1175) >> DTC P0443 or P0449 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  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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