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.
1994 Geo Tracker Base, 1.6 U, AutomaticFACTORY OEM SERVICE PROCEDURE
Trouble Code Definitions
NOTE:
Trouble codes will be recorded at various operating times. Some codes require sensor or switch operation for 5 seconds and others may require longer under certain conditions. Some codes may not set in a service bay operational mode.
TROUBLE CODE IDENTIFICATION
| Code | Circuit Affected | Probable Cause | ||||
|---|---|---|---|---|---|---|
| 13 | Heated Oxygen Sensor | Open Circuit | ||||
| 14 | Coolant Temp. Sensor | Low Temp. Indicated | ||||
| 15 | Coolant Temp. Sensor | High Temp. Indicated | ||||
| 21 | Throttle Position Sensor | Signal Voltage High | ||||
| 22 | Throttle Position Sensor | Signal Voltage Low | ||||
| 23 | Intake Air Temp. Sensor | Low Temp. Indicated | ||||
| 24 | Vehicle Speed Sensor | Incorrect Signal Voltage | ||||
| 25 | Intake Air Temp. Sensor | High Temp. Indicated | ||||
| 31 (1) | MAP Sensor | High Voltage Input, | ||||
| High Vacuum | ||||||
| 32 (1) | MAP Sensor | Low Voltage Input, | ||||
| Low Vacuum | ||||||
| 33 (2) | MAF Sensor | High Current Input | ||||
| 34 (2) | MAF Sensor | Low Current Input | ||||
| 41 | Ignition Signal | No Signal | ||||
| 42 | Camshaft Position Sensor | No Signal | ||||
| For 2-3 Seconds | ||||||
| 44 | Idle Switch | Open/Misadjusted | ||||
| 45 | Idle Switch | Grounded/Misadjusted | ||||
| 51 | EGR System | Out Of Calibration | ||||
| 52 (2) | Fuel System | Fuel Leakage Detected | ||||
| 53 (1) | Ground | Circuit Open | ||||
| 53 (2) | ECM Failure | Failure Detected | ||||
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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.