Canister Purge Control Valve: Testing and Inspection

Fig. 020 CHART C-6BC CANISTER PURGE VALVE CHECK:

Canister purge is controlled by a solenoid that allows manifold vacuum to purge the canister when de-energized. The ECM supplies a ground to energize the solenoid (purge off). The solenoid is energized (no purge) by grounding the test terminal with the ignition "ON" and engine stopped, or with the engine running if the following are met:

a. Engine run time less than specified.
b. Coolant temperature below a given value.
c. Vehicle speed below a given value.
d. TPS below a given value.

If the above are not met, the purge solenoid should be de-energized, that is purge "ON."