Canister Purge Control Valve: Testing and Inspection

Canister Purge Control Diagnosis:

DFI Emission Circuit:

DESCRIPTION

The canister purge solenoid receives 12 volts from the 10 amp number 5 fuse on the underhood relay panel through circuit 639. The ECM energizes the canister purge solenoid by grounding pin A10 (circuit 428). When the solenoid is energized it allows the canister to purge.

The canister is commanded to purge when:

^ Coolant is above 70°C.

^ Closed loop has been achieved for at least 9 seconds.

^ Throttle switch is open.

^ Code E013, E044, or E045 are present.


TEST DESCRIPTION: The numbers below refer to circled numbers on the diagnostic chart.

1. Checking for the canister purge solenoid able to hold vacuum. If the solenoid can't hold vacuum, it should be replaced.

2. Vacuum should release when the solenoid is cycled on an output cycling.

3. Checking for proper vacuum signals from the throttle body.

4. Checking for proper electrical signals to the canister purge solenoid.