F 250 2WD HD Pickup V8-7.3L DSL Turbo VIN F (1997)
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Neutral Safety Switch: Description and Operation
The electronic E4OD and 4R70W transmissions are equipped with a Transmission Range (TR) sensor. In addition to providing the Powertrain Control
Module (PCM) with manual lever position (P R N OD D 2 1) signals, the sensor provides a neutral safety switch function. The circuit to the starter
motor solenoid relay switch is interrupted in all gearshift lever positions except PARK and NEUTRAL.