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.
1992 Geo Tracker Base, 4WD, StandardFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes
- Introduction
- Self-Diagnostic System
- Summary
- Diagnostic Code Charts
- Notes
- Diagnostic Circuit Check
- Chart A-1, No Check Engine Light
- Chart A-2, Check Engine Light On At All Times, Will Not Flash Code 12
- Code 13, Oxygen Sensor Circuit Open Circuit
- Code 14, Coolant Temp Sensor (Cts) CKT, Low Temp Indicated
- Code 15, Coolant Temp Sensor (Cts) CKT, High Temp Indicated
- Code 21, Throttle Position Sensor CKT, Signal Voltage High
- Code 22, Throttle Position Sensor CKT, Signal Voltage Low
- Code 23, Intake Air Temp Sensor CKT, Low Temp Indicated
- Code 24, Vehicle Speed Sensor (VSS) Circuit
- Code 25, Intake Air Temp Sensor CKT, High Temp Indicated
- Code 31, Map Sensor Circuit, Signal Voltage High - Low Vacuum
- Code 32, Map Sensor Circuit, Signal Voltage Low - High Vacuum
- Code 41, Ignition Signal Circuit, No Signal
- Code 42, Crank Angle Sensor Circuit, No Signal For 3 Seconds
- Code 44, Idle Switch Circuit, Open Circuit Or MISADJUSTED TPS
- Code 45, Idle Switch CKT, CKT Grounded Or MISADJUSTED TPS
- Code 51, EGR System & EGR Temp Sensor (EGRTS) CKT, Temp Too Low Or Too High (CALIF. Only)
- Code 53, Ground Circuit Open (CALIF. Only)
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.
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