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
Trouble Code Id Chart
TRACKER TROUBLE CODE IDENTIFICATION CHART
| Code | System Affected | Probable Cause | ||||||
|---|---|---|---|---|---|---|---|---|
| 13 | Oxygen Sensor | Open Circuit | ||||||
| 14 | Coolant Temperature | Low Temperature Indicated | ||||||
| 15 | Coolant Temperature | High Temperature Indicated | ||||||
| 21 | Throttle Position Sensor | Signal Voltage High | ||||||
| 22 | Throttle Position Sensor | Signal Voltage Low | ||||||
| 23 | Manifold Air Temperature Sensor | High Temp. Indicated | ||||||
| 25 | Manifold Air Temperature Sensor | Low Temp. Indicated | ||||||
| 31 | Manifold Absolute Pressure Sensor | Signal Voltage High With Low Vacuum | ||||||
| 32 | Manifold Absolute Pressure Sensor | Signal Voltage Low With High Vacuum | ||||||
| 41 | Ignition Signal Circuit | No Signal | ||||||
| 42 (1) | 5th Gear Switch Circuit | Grounded Circuit | ||||||
| 42 (2) | TCC Lock-Up Signal Circuit | Signal Voltage Remains On At All Times | ||||||
| 44 | Idle Switch Circuit | Open Circuit Or Misadjusted Switch | ||||||
| 45 | Idle Switch Circuit | Grounded Circuit Or Misadjusted Switch | ||||||
| 51 (3) | EGR System & EGTS | Temp. Too Low Or Too High | ||||||
| 53 (3) | Ground Circuit | Open Circuit | ||||||
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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.