Canister Purge Solenoid: Testing and Inspection

Canister Purge Control Diagnosis:

PFI 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 PCM/ECM energizes the canister purge solenoid by grounding pin E7 (circuit 428). When the solenoid is energized it allows the canister to purge.

The canister is commanded to purge when:

^ Coolant is above 80°C.

^ Closed loop has been achieved for at least 30 seconds.

^ Throttle switch is open.

^ Vehicle speed greater than 10 MPH.

^ Engine speed above a threshold.

^ Code E013, E017, E042, E043, E044, or E045 are present.

The PCM/ECM will de-energize the solenoid (not allow purge) when codes E016 is set or the PCM/ECM is running in the backup mode (no normal program control).