Evaporative Canister Purge Solenoid

Canister Purge Solenoid Check:

Canister Purge Solenoid:

CIRCUIT DESCRIPTION:
12 volts is applied to CKT 439 at terminal "A" when the ignition key is turned "ON". As the engine coolant temperature rises during engine operation (45°C - 113°F) or when short term fuel trim count is greater than 122, the control module will then ground CKT 428 at terminal "B". The purge solenoid will then open the vapor canister to purge the fuel, and direct it to the intake manifold for normal combustion when it is needed.

CHART TEST DESCRIPTION:
Numbers below refer to circled numbers 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.