Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Procedures
1998 Saturn SC1 AutomaticSECTION Diagnostic Procedures
- Connect scan tool. Turn ignition on, engine off. Using scan tool, command EVAP canister purge solenoid on and off. If solenoid clicks on and off when commanded, go to next step. If solenoid does not click, go to step 3).
- Observe status of purge feedback. If scan tool status displays HIGH when commanded off or LOW when commanded on, problem is intermittent. See DIAGNOSTIC AIDS. If scan tool display is not as indicated, check for short to ground in circuit between EVAP canister purge solenoid and PCM. Repair as necessary. If circuit is okay, replace PCM.
- Check EGR fuse located in underhood fuse block. If fuse is okay, go to next step. If fuse is faulty, check for shorted circuit between fuse block and purge solenoid. Replace fuse.
- Disconnect solenoid harness connector. Turn ignition on. Connect test light between harness terminals. If test light does not illuminate, go to next step. If test light illuminates, check for short in circuit between EVAP purge solenoid and PCM. Repair as necessary. If circuit is okay, replace PCM.
- Using scan tool, command EVAP vent solenoid on. If test light illuminates, replace EVAP purge solenoid. If test light does not illuminate, go to next step.
- Using test light connected to ground, probe EVAP purge solenoid harness connector terminal "A". If test light illuminates, check for open in circuit between solenoid and PCM. Repair as necessary. If circuit is okay, replace PCM. If test light does not illuminate, check for open between solenoid and fuse block.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.