Diagnostic Procedures

Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
Connect EVAP Pressure/Purge Diagnostic Station (J 41413) to EVAP service port. Ensure vacuum gauges on diagnostic station is zeroed. Turn rotary switch on diagnostic station to PURGE position. Start engine. Monitor vacuum gauge on diagnostic station. If vacuum reading is -15 in. H2O, go to next step. If vacuum reading is not -15 in. H2O, see DIAGNOSTIC AIDS.
Turn ignition off. Disconnect EVAP purge solenoid harness connector. Turn ignition on, engine off. Connect test light between battery voltage and EVAP purge solenoid connector terminal "B". If test light illuminates, go to next step. If test light does not illuminate, go to step 6).
Turn ignition off. Disconnect VCM harness connector. Turn ignition on, engine off. Connect test light between battery voltage and EVAP purge solenoid connector terminal "B". If test light illuminates, go to next step. If test light does not illuminate, go to step 7).
Repair short to ground in EVAP purge valve driver circuit. After repairs, go to step 8).
Replace EVAP canister purge solenoid. After replacing solenoid, go to step 8).
Replace VCM. Program replacement VCM using required equipment. After replacing VCM, go to next step.
Using a scan tool, select DTC, CLEAR INFO. Perform SERVICE BAY TEST for EVAP system. After performing tests, go to next step.
Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTCs are displayed, go to applicable DTC test. If no additional DTCs are set, system is okay.