K 2500 Suburban 4WD V8-454 7.4L (1994)
Canister Purge Solenoid: Testing and Inspection
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 > 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.
