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 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Tests W/Codes
- Introduction
- Check Engine Light
- Retrieving Codes
- Trouble Code Id Chart
- Clearing Codes
- Summary
- Diagnostic Circuit Check
- A1, No "CHK Eng" Lite
- A2, No Code 12 Flash
- A3, Cranks/No Run
- A5, Fuel Injector System Check
- A7A, Fuel System Diagnosis
- A7B, Fuel Pressure Check
- A8, Control Relay Circuit
- Code 13, O2 Circuit Open
- Code 14, Cts Temp Low
- Code 15,M Cts Temp High
- Code 21, TPS Signal High
- Code 22, TPS Signal Low
- Code 23, Mat Temp High
- Code 25, Mat Temp Low
- Code 31, Map Signal High
- Code 32, Map Signal Low
- Code 41, No IGN Signal
- Code 42, 5TH Gear Circuit
- Code 42, TCC Circuit
- Code 44, Idle Switch Circuit
- Code 45, Idle Switch Circuit
- Code 51, EGR System
- Code 53, Ground Circuit
- C1, ECM Circuit Check
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.