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Home >> Ford >> 1995 >> Escort L4-110 1.8L DOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Transmission Position Sensor/Switch >> Description and Operation
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Transmission Position Sensor/Switch: Description and Operation

Transmission Range Switch:






PURPOSE
The Transmission Range (TR) switch serves a dual purpose:

- Prevents unintentional vehicle movement caused by engine cranking and starting with the shift control selector lever in a forward or reverse position.

- Informs the Powertrain Control Module (PCM) that the transmission is either in neutral or any other gear. Input is used in PCM calculations for fuel injection quantity, idle speed, A/C cut-off, and purge control.

OPERATION
Manually controlled by the shift control lever and transmission shift cable. When the transmission is in PARK or NEUTRAL, switch is ON (shows continuity).
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