Engine Controls - Removal & Installation: Diagnosis Chevrolet TrailBlazer I

Inspection Procedure

Note. DO NOT perform this procedure unless instructed by an Evaporative Emission (EVAP) diagnostic.

Note. Use EVAP Pressure/Purge Diagnostic Station (J-41413) in order to provide a clean, dry, low pressure gas source.

1. Turn ignition off. Remove EVAP canister purge solenoid. See «EVAP CANISTER PURGE SOLENOID»(ref-159085-S18038319072003111100000) under MOTORS, RELAYS & SOLENOIDS. Lightly tap the EVAP canister purge solenoid on a clean, hard surface. Inspect for carbon particles exiting either of the vacuum ports. If no carbon particles are found, reinstall EVAP canister purge solenoid and perform «CLEANING PROCEDURE»(ref-159085-S08838531462003111100000) .
2. If carbon particles are found during the inspection procedure, replace EVAP canister purge solenoid and perform «CLEANING PROCEDURE»(ref-159085-S08838531462003111100000) . If you were instructed to replace the EVAP canister purge solenoid, and no carbon particles are found, return to the EVAP diagnostic procedure. DO NOT perform the «CLEANING PROCEDURE»(ref-159085-S08838531462003111100000) .