Canister Purge Solenoid

Canister Purge Solenoid Check:

Canister Purge Solenoid Circuit:

CIRCUIT DESCRIPTION
Battery voltage is applied to the EVAP Canister Purge Solenoid when the ignition key is turned "ON". Once the engine coolant has reached normal operating temperature, the control module grounds the EVAP Canister Purge Control circuit. The purge solenoid will open, allowing the fuel vapors from the vapor canister to be directed to the intake manifold.


TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart:

1. Checks to see if a vacuum source is present along with certain conditions before the purge solenoid is commanded "ON". Also shows a change of vacuum as purge solenoid is being cycled.
2. Checks for power to the solenoid, the ground circuit the connections at the purge solenoid and the solenoid itself.
3. Checks for open or grounded CKT 439.
4. Checks for open CKT 428 or faulty control module.