What does the Transmission Range (TR) sensor do according to this diagram?

It is a series of step-down resistors acting as a voltage divider; the PCM monitors the voltage corresponding to manual lever position to determine desired gear and EPC pressure. It also houses the START circuits so the vehicle can only be started in PARK or NEUTRAL, and contains the backup lamp and 4x4 low circuits.

What is the Output Shaft Speed (OSS) sensor used for?

Its frequency signal supplies the PCM with output shaft speed information, used to determine shift scheduling, torque converter engagement schedule, and EPC pressure.

What fuses power these transmission circuits?

Fuse 13 (25A) in the Interior Fuse Panel, hot in start or run, and fuse 13 (30A) in the Power Distribution Box, hot at all times.

What does the PCM power relay feed?

It directs voltage to the torque converter clutch solenoid, the electronic pressure control solenoid, and the shift solenoids.

What wire circuits connect the TR sensor to other systems?

298 P/O to backup lamps (page 93-1), 329 PK and 32 R/LB to the starting system (pages 20-2, 20-3), 463 R/W and 57 BK to electric shift control (page 34-1), 359 GY/R to engine controls (page 25-5), and 199 LB/Y through C116F/C116M to PCM pin 14 at C202.

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Ford Transmission Wiring Diagram - TR Sensor, OSS Sensor & PCM Circuits (T1)

PCM and output shaft speed sensor wiring diagram with color-coded circuits

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Wiring diagram of PCM power relay, output shaft speed sensor and transmission range sensor circuits with color codes.

AI caption March 2015 · Photo 65 of 343

This document is a Ford factory-style wiring diagram (EVTM page) covering the transmission control circuits, centered on the Transmission Range (TR) sensor and the Output Shaft Speed (OSS) sensor and their connections to the Powertrain Control Module (PCM). Power feeds are shown from the Interior Fuse Panel (fuse 13, 25A, hot in start or run) and the Power Distribution Box (fuse 13, 30A, hot at all times) through the PCM power diode and PCM power relay, which directs voltage to the torque converter clutch solenoid, electronic pressure control solenoid, and shift solenoids. The TR sensor (connector C176) is described as a series of step-down resistors acting as a voltage divider; it houses the START circuits allowing starting in PARK or NEUTRAL, plus backup lamp and 4x4 low circuits. Circuits shown include 298 P/O (backup lamps), 329 PK (starting system), 463 R/W and 57 BK (electric shift control), 359 GY/R (engine controls), and 199 LB/Y to PCM pin 14. The OSS sensor supplies frequency data used for shift scheduling, torque converter engagement, and EPC pressure. Connectors referenced include C147F/M, C116F/M, C109, C176, and C202 (pins 34, 24, 51, 26, 76, 80, 103, 25, 14), with grounds at G101 and G201 and splices S105, S135, S137.

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Frequently asked questions

What does the Transmission Range (TR) sensor do according to this diagram?: It is a series of step-down resistors acting as a voltage divider; the PCM monitors the voltage corresponding to manual lever position to determine desired gear and EPC pressure. It also houses the START circuits so the vehicle can only be started in PARK or NEUTRAL, and contains the backup lamp and 4x4 low circuits.
What is the Output Shaft Speed (OSS) sensor used for?: Its frequency signal supplies the PCM with output shaft speed information, used to determine shift scheduling, torque converter engagement schedule, and EPC pressure.
What fuses power these transmission circuits?: Fuse 13 (25A) in the Interior Fuse Panel, hot in start or run, and fuse 13 (30A) in the Power Distribution Box, hot at all times.
What does the PCM power relay feed?: It directs voltage to the torque converter clutch solenoid, the electronic pressure control solenoid, and the shift solenoids.
What wire circuits connect the TR sensor to other systems?: 298 P/O to backup lamps (page 93-1), 329 PK and 32 R/LB to the starting system (pages 20-2, 20-3), 463 R/W and 57 BK to electric shift control (page 34-1), 359 GY/R to engine controls (page 25-5), and 199 LB/Y through C116F/C116M to PCM pin 14 at C202.