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.
1985 BMW 635CSi AutomaticFACTORY OEM SERVICE PROCEDURE
Test 14: Air Temperature Sensor
- Check the electrical connections on the sensor. Use procedures in BMW TEST KIT, L-JETRONIC PROCEDURES BROCHURE that comes with the BMW Service Test Kit, Test 4 to check Air Temperature Sensor values. If values are incorrect, remove connector from sensor and attach volt/ohmmeter. Check resistance between terminals 22 and 6 and compare with the specifications table. See the AIR TEMPERATURE SENSOR RESISTANCE Specifications table.
- If resistance values are correct, trace sensor circuit and repair wiring. If values are incorrect, replace Air Flow Sensor.
AIR TEMPERATURE SENSOR RESISTANCE SPECIFICATIONS
| Air Temperature °F (°C) | Resistance - Ohms |
|---|---|
| 66-70 (19-21) | 2280-2720 |
| 120-124 (49-51) | 760-910 |
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.