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
Sensor Range Charts: Introduction: Notes
Sensor operating range information is supplied so that it can be determined if a sensor is out of calibration. A sensor that is out of calibration may not set a trouble code, however; it may cause driveability problems.
NOTE:
All voltage tests should be performed with a Digital Volt Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless specifically stated different in testing procedures.
AIR TEMPERATURE SENSOR RESISTANCE (METRO & TRACKER) (1)
| Temperature °F (°C) | Resistance Ohms | ||
|---|---|---|---|
| 68 (20) | 2210-2690 | ||
| 104 (40) | 1140 | ||
| 140 (60) | 580 | ||
| 176 (80) | 290-350 | ||
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AIR VALVE COOLANT TEMPERATURE SENSOR (METRO)
| Temperature °F (°C) | Valve Position |
|---|---|
| 140 (60) | Fully Closed |
CTS RESISTANCE (METRO, SPECTRUM & TRACKER) (1)
| Temperature °F (°C) | Resistance Ohms | |||
|---|---|---|---|---|
| Metro | ||||
| 68 (20) | 2210-2690 | |||
| 104 (40) | 1140 | |||
| 140 (60) | 580 | |||
| 176 (80) | 290-350 | |||
| Spectrum | ||||
| 68 (20) | 2100-2900 | |||
| Tracker | ||||
| 68 (20) | 2280-2870 | |||
| 104 (40) | 1060 | |||
| 140 (60) | 530-700 | |||
| 176 (80) | 290-390 | |||
|
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MAT SENSOR RESISTANCE (METRO & TRACKER) (1)
| Temperature °F (°C) | Resistance Ohms | ||
|---|---|---|---|
| 210 (99) | 185 | ||
| 160 (71) | 450 | ||
| 100 (38) | 1800 | ||
| 70 (21) | 3400 | ||
| 40 (4) | 7500 | ||
| 20 (-7) | 13,500 | ||
| 0 (-18) | 25,000 | ||
| -40 (-40) | 100,000 | ||
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OXYGEN SENSOR VOLTAGE
| Condition | Volt |
|---|---|
| Lean | .1 |
| Rich | .9 |
THROTTLE POSITION SENSOR RESISTANCE (METRO A/T)
| Position | Resistance Ohms | ||||
|---|---|---|---|---|---|
| Idle (1) | 4370-8130 | ||||
| Idle (2) | 240-1140 | ||||
| WOT (2) | 3170-6600 | ||||
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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.