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 Tracker Base, 4WD, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes
- Introduction
- Self-Diagnostic System
- Diagnostic Code Charts
- Notes
- Diagnostic Circuit Check
- Chart A-1, No Malfunction Indicator Light (Mil)
- Chart A-2, Wont Flash Code 12 Or Any Codes, Mil On Steady
- Code 13, Heated Oxygen Sensor Circuit, Open Circuit
- Code 14, ECT Sensor Circuit, Low Temperature Indicated
- Code 15, ECT Sensor Circuit, High Temperature Indicated
- Code 21, TP Sensor Circuit, Signal Voltage High
- Code 22, TP Sensor Circuit, Signal Voltage Low
- Code 23, IAT Sensor Circuit, Low Temperature Indicated
- Code 24, Vehicle Speed Sensor (VSS) Circuit
- Code 25, IAT Sensor Circuit, High Temperature Indicated
- Code 31, Map Sensor Circuit, High Voltage Input - High Vacuum
- Code 32, Map Sensor Circuit, Low Voltage Input - Low Vacuum
- Code 41, Ignition Signal Circuit, No Signal (1 Of 2)
- Code 42, Camshaft Position Sens CKT, No Signal For 2 Seconds
- Code 44, Idle Switch Circuit, Open Circuit Or MISADJUSTED
- Code 45, Idle Switch Circuit, Circuit Grounded Or MISADJUSTED
- Code 51, EGR Circuit (CALIF. Only)
- Code 53, Ground Circuit, Circuit Open (CALIF. Only)
- Summary
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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