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.
1993 Geo Prizm Base, StandardFACTORY OEM SERVICE PROCEDURE
Engine Controls - Basic Testing
- Introduction
- Preliminary Inspection & Adjustments
- Fuel System
- Ignition Checks
- Idle Speed & Ignition Timing
- Diagnostic Charts
- Chart A1-3, Engine Cranks But Will Not Run (PRIZM)
- Chart A1-5, Engine Cranks, Won't Run (Fuel Injector CKT Test) (PRIZM)
- Chart A1-7A, Fuel System CKT Opening Relay Check (PRIZM)
- Chart A1-7B, Fuel SYS Diagnosis (Fuel Pressure Check) (PRIZM)
- CHART A2-3, ENGINE CRANKS BUT WILL NOT RUN (PRIZM LSi)
- CHART A2-5, FUEL INJECTOR CIRCUIT TEST (NO-START) (PRIZM LSi)
- CHART A2-7A, FUEL SYSTEM CKT OPENING RELAY CHECK (PRIZM LSi)
- CHART A2-7B, FUEL SYSTEM PRESSURE TEST (PRIZM LSi)
- Summary
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.
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