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.
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HOMESERVICE MANUALSSATURN2000SC2 AUTOMATIC, MP6REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SELF-DIAGNOSTICSDIAGNOSTIC TESTSDTC P0403: EGR SOLENOID CONTROL CIRCUITDIAGNOSTIC PROCEDURES
2000 Saturn SC2 Automatic, MP6
Diagnostic Procedures
2000 Saturn SC2 Automatic, MP6SECTION Diagnostic Procedures
- Turn ignition on, engine off. Using scan tool, monitor EGR SOLENOID - OPEN or EGR SOLENOID - HIGH VOLT test. If scan tool indicates TEST FAIL, go to next step. If scan tool does not indicate TEST FAIL, problem is intermittent. See DIAGNOSTIC AIDS .
- Disconnect EGR solenoid harness connector. Connect a test light between EGR solenoid harness connector terminals "A" (Light Blue wire) and "E" (Red wire). Using scan tool, monitor EGR SOLENOID - OPEN or EGR SOLENOID - HIGH VOLT test. If scan tool does not indicate TEST PASS, go to next step. If scan tool indicates TEST PASS, check for terminal tightness or faulty EGR solenoid. Repair or replace as necessary.
- Using DVOM, check voltage on EGR solenoid harness connector terminal "E" (Red wire). If ignition voltage is present, go to next step. If ignition voltage is not present, check for open in circuit or for terminal tightness. Repair as necessary. If circuit or terminal connector is okay, replace PCM.
- Connect a test between battery voltage and EGR solenoid harness connector terminal "A" (Light Blue wire). If test light illuminates, check for short to voltage in circuit No. 1676 (Red wire) between EGR and PCM. If test light does not illuminate, check for open in circuit or for terminal tightness. Repair as necessary. If circuit or terminal connector is okay, replace PCM.
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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.