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
1997 Saturn SC1 AutomaticSECTION Diagnostic Procedures
- Connect scan tool. Start engine and check if DTC P0351 or P1351 is set. If DTC(s) are present, go to next step. If DTC(s) are not present, problem is intermittent. See DIAGNOSTIC AIDS.
- If only DTC P0351 is present, go to next step. If both DTCs P0351 and P1351 are present, turn ignition off. Disconnect EI module harness connector. Attempt to start engine. If only DTC P0351 resets, replace EI module. If DTCs P0351 and P1351 resets, check for short to voltage in IC 1/4 diagnostic feedback circuit or faulty PCM.
- Turn ignition off. Disconnect EI module harness connector. Using DVOM connected to ground, probe IC 1/4 diagnostic feedback circuit while cranking engine. If voltage is varying between 0-5 volts, check terminal tightness to EI module or for faulty EI module. If voltage is not varying, go to next step.
- Check IC 1/4 circuit for open or short to ground. Repair as necessary. If circuit is okay, check for tightness at EI module harness connector.
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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.