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.
1989 Geo Tracker LSi, AutomaticFACTORY OEM SERVICE PROCEDURE
Retrieving Codes
- Ensure battery has a minimum of 11 volts. Always use a digital type test meter. Never connect or disconnect ECM wiring harness connector when ignition switch is in the "ON" position.
- When performing diagnostic procedures, DO NOT apply meter probes to ECM unless wiring harness connector is attached. Checks are made from the rear side of the ECM wiring harness connector.
- When performing terminal checks, ensure that negative probe is grounded to vehicle body. Before checking for trouble codes, perform diagnostic circuit check. This will ensure on-vehicle diagnostics is working. Refer to DIAGNOSTIC CIRCUIT CHECK chart.
- Insert spare fuse into "Diagnosis Switch Terminal", located in passenger compartment fuse block. Proceed to CODE CHARTS for diagnosing stored codes.
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.