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 Eagle Premier ESFACTORY OEM SERVICE PROCEDURE
Manifold Air Temperature (MAT) Sensor
- Disconnect wire harness connector from MAT sensor. Using a DVOM, sensor resistance should be less than 1000 ohms with engine at operating temperature.
- Check resistance between ECU terminal "C8" and sensor connector and ECU terminal "D3" and sensor connector. See Figure . Repair wire harness if resistance is more than one ohm. Refer to MANIFOLD AIR TEMPERATURE SENSOR RESISTANCE table. Replace sensor if not within specification.
MANIFOLD AIR TEMPERATURE SENSOR RESISTANCE
| °F (°C) | (1) Ohms | ||
|---|---|---|---|
| 212 (100) | 185 | ||
| 160 (70) | 450 | ||
| 100 (38) | 1600 | ||
| 70 (20) | 3400 | ||
| 40 (4) | 7500 | ||
| 20 (-7) | 13,500 | ||
| 0 (-18) | 25,500 | ||
| -40 (-40) | 100,700 | ||
|
|||
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.