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.
1996 Geo Prizm Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Controls - Basic Testing 1.6 & 1.8L
- Introduction
- Preliminary Inspection & Adjustments
- Fuel System
- Ignition Checks
- Idle Speed & Ignition Timing
- Circuit Tests
- Notes
- Circuit Test A1-3 - Engine Cranks But Will Not Start
- Circuit Test A1-5 - Fuel Injector CKT Check/Engine No-Start
- Circuit Test A1-7A - Fuel SYS Diagnosis/Fuel Pump RLY Check
- Circuit Test A1-7B - Fuel SYS Diagnosis/Fuel Pressure Check
- Circuit Test A2-3 - Engine Cranks But Will Not Start
- Circuit Test A2-5 - Fuel Injector CKT Check/Engine No-Start
- Circuit Test A2-7A - Fuel SYS Diagnosis/CKT Opening RLY CHCK
- Circuit Test A2-7B - Fuel SYS Diagnosis/Fuel Pressure Check
- Circuit Test A2-7C - Fuel SYS Diagnosis/Fuel INJCTR Coil Test
- Circuit Test A2-7D - Fuel SYS Diagnosis/Fuel INJCTR Coil Test
- Circuit Test A2-7E - Fuel System Diagnosis/Fuel Injector Balance Test
- 1.6L (VIN 6) Chart A1-3, Engine Cranks But Will Not Run
- 1.6L (VIN 6) Chart A1-5, Fuel Injector Circuit Check (Engine No-Start)
- 1.6L (VIN 6) Chart A1-7A, Fuel System Diagnosis (Circuit Opening Relay Check)
- 1.6L (VIN 6) Chart A1-7B, Fuel System Diagnosis (Fuel Pressure Check)
- 1.8L (VIN 8) Chart A2-3, Engine Cranks But Will Not Run
- 1.8L (VIN 8) Chart A2-5, Fuel Injector Circuit Check (Engine No-Start)
- 1.8L (VIN 8) Chart A2-7A, Fuel System Diagnosis (Circuit Opening Relay Check)
- 1.8L (VIN 8) Chart A2-7B, Fuel System Diagnosis (Fuel Pressure Check)
- Summary
- Wiring Diagrams
Factory Service Tools
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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.