Canister Purge Valve

Canister Purge Valve:

The opening times of the canister purge valve are determined by the information supplied to the ECM about:


^ the composition of the exhaust gases

^ engine temperature

^ engine load

^ engine rpm

^ and other parameters.

The canister purge valve is activated by being grounded via pin 27 of the ECM.

In order to permit diagnosis of the canister purge valve the circuit from pin 27 is also connected to pin 21.