Here friend will discover useful basic information and also important tips relating to transmission selection sensors in vehicles.

You are watching: What does a transmission range sensor do


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The transmission variety sensor determines the infection speed. The transmission manage system supplies this details to, because that example, calculate which equipment is required and also the moving time. Scroll through this page and also find out around common variants, their useful principle, and also how you can examine transmission variety sensors using basic methods.


Important safety and security note The complying with technical information and also practical tips have been compiled by chathamtownfc.net in stimulate to administer professional support to automobile workshops in their day-to-day work. The information noted on this website is intended for usage by suitably qualified personnel only.

 


Transmission selection sensors record the transmission speed. This information is forced by the regulate unit to manage the shifting pressure as soon as shifting gears and to decide which equipment needs come be engaged at i m sorry point.

 

There space two varieties of transmission variety sensor design: hall generators and inductive sensors.

 

The rotation of the ring gear transforms the magnetic field, which, in turn, transforms the voltage in the transmission variety sensor. These voltage signals room forwarded come the manage unit by the transmission variety sensor.


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Transmission selection sensor


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Transmission range sensor


TRANSMISSION selection SENSOR FAULTY: SYMPTOMS


A faulty transmission selection sensor have the right to manifest itself together follows:

fail of the transmission manage system, the manage unit switches to an emergency regime Engine indicator lamp come on

CAUSES the FAULTY TRANSMISSION variety SENSORS: cause OF FAILURE


Causes the failure have the right to be:

Internal short circuits breaks in wiring brief circuits in wiring Mechanical damage to the encoder wheel Contamination caused by steel abrasion

CHECKING THE TRANSMISSION selection SENSOR: TROUBLESHOOTING


The following test measures should be taken into consideration during troubleshooting:


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Hall generator – instance OK


Check the sensor


Check the sensor for contamination


Check the encoder wheel


Check the encoder wheel because that damage


Read the end fault memory


Read out the fault memory


Measure the resistance of the inductive sensor using an ohmmeter


Reference value at 80°C: approx. 1,000 ohms.


Check the supply voltage come the hall generator using a voltmeter


(circuit chart for pen assignment required).

 

Attention: carry out not measure the resistance ~ above the room generator together doing so could destroy the sensor.


Check the continuous of the sensor"s connecting lines in between the control unit connector and also sensor connector


(circuit diagram for pen assignment required).

 

Reference value: 0 ohm.


Check the sensor"s connecting lines for a short circuit come frame


With the regulate unit connector traction out, measure against vehicle ground at the sensor connector making use of the ohmmeter.

 

Reference value: >30 MOhm.


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