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.
Output Shaft Speed (OSS) Sensor
The output shaft speed (OSS) sensor is located in the transmission housing above the rotor in the differential.
The OSS sensor is an inductive sensor which detects the vehicle speed by means of a rotor on the differential.
The signal is used for the following functions among other things:
- To determine the shift timing,
- To supply the vehicle speed input signal for the TCM.
If the OSS sensor fails, the signal of the TSS sensor is used as a substitute signal.
The transmission range (TR) sensor is located on the manual shaft on the transmission housing.
When the manual shaft is moved by means of the manual selector lever cable, an engagement pin in the inner ring of the TR sensor moves through the different positions. The signals are transmitted to the TCM, the reversing lamps and the starter inhibitor relay.
The signals of the TR sensor are used for the following functions:
- To recognize the manual selector lever position.
- To actuate the starter inhibitor relay.
- To actuate the reversing lamps.
No substitute signal is available for the TR sensor.
If the connection is cut, the vehicle cannot be started.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra 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.