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.
1994 Geo Prizm Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Circuit Opening Relay
- Circuit opening relay is located behind center of dash, near radio. To test circuit opening relay, see CHART A1-7A, FUEL SYSTEM DIAGNOSIS (CIRCUIT OPENING RELAY CHECK) diagnostic chart in BASIC TESTING article in this section.
- To test circuit opening relay on LSi, see CHART A2-7A, FUEL SYSTEM DIAGNOSIS (CIRCUIT OPENING RELAY CHECK) diagnostic chart in BASIC TESTING article in this section. For identification of Data Link Connector (DLC) terminals, see illustration. See Fig 1 .
Factory Service Tools
Use the Manual With the Right Hardware
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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.