Electra V6-231 3.8L VIN C SFI (1988)
Wiring Diagram for Chart C-3 Canister Purge Valve
CHART C-3
TESTING CANISTER PURGE SOLENOID
Circuit Description:
Canister purge is controlled by a solenoid that allows vacuum to purge the canister when energized. The ECM supplies a ground to energize the solenoid
(purge "ON"). If the diagnostic test terminal is grounded with the engine stopped or the following is met with the engine running the purge solenoid is
energized (purge "ON") .
Engine run time after start more than l minute.
Coolant temperature above 80 C (176 degrees F).
Vehicle speed above 5 mph (8 kmh).
Throttle "OFF" idle.
TPS signal above .75 volt.
Test Description:
Numbers below refer to circled numbers on the diagnostic chart.
1.
Checks to see if the solenoid is opened or closed. The solenoid is normally de-energized in this step, so it should be closed.
2.
Completes functional check by grounding test terminal. This should normally energize the solenoid and allow the vacuum to drop (purge ON).
3.
Checks for open or shorted solenoid circuit.
