What does the BOO switch do in the E4OD circuit?

The Brake On/Off (BOO) switch sends a signal to the PCM to disengage the torque converter clutch when the brake pedal is depressed. The PCM may ignore this signal if the TP signal is above closed throttle.

What does it mean when the TCIL flashes?

The Transmission Control Indicator Lamp indicates that 4th gear has been disengaged, and may also flash if monitored sensors/actuators or circuits have failed.

What fuses power the E4OD circuit?

Fuse position 13 (15A, hot at all times) and fuse position 17 (10A, hot in start or run) in the fuse panel, shown on pages 13-7 and 13-11.

How does the Transmission Range (TR) sensor work?

It uses a series of step-down resistors acting as a voltage divider; the PCM monitors the voltage corresponding to the manual lever position to determine desired gear and EPC pressure. It also houses the START circuits allowing starting in PARK or NEUTRAL, plus the backup lamp and 4x4 low-neutral sense circuits, which are closed in reverse.

What wire circuit connects the PCM to the TR sensor?

Circuit 359 GY/R runs from PCM pin 46 through C185, S137, C103M/C103F, S146 and C1012 to the TR sensor; circuit 199 LB/Y returns from the TR sensor (pin 3 via C1012) through C103F/C103M and C185 to PCM pin 30.

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1995 Ford Bronco E4OD Transmission Wiring Diagram - BOO Switch, TCS, TR Sensor

Wiring diagram 30-1 for E4OD transmission showing BOO switch, TCS, TR sensor and PCM circuits with color codes

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Wiring diagram for the E4OD transmission control circuits, including the brake on/off switch, transmission control switch, and range sensor to the PCM.

AI caption April 2011 · Photo 955 of 2216

This document is page 30-1 of a Ford factory wiring diagram set covering the E4OD automatic transmission electrical circuit. It shows power feeds from the fuse panel (a 15A fuse at position 13, hot at all times, and a 10A fuse at position 17, hot in start or run) feeding the Brake On/Off (BOO) switch and the Transmission Control Switch (TCS) with its Transmission Control Indicator Lamp (TCIL). Wiring circuits are identified by number and color, including 383 R/W, 10 LG/R, 640 R/Y, 511 LG, 911 W/LG, 224 T/W, 359 GY/R, and 199 LB/Y, with connectors C279, C275F/M, C202F/M, C103M/F, C1012, and C185, plus splices S236, S215, S240, S137, and S146. PCM pins 2, 41, 32, 46, and 30 are shown. Explanatory callouts describe how the BOO switch signals the PCM to disengage the torque converter clutch, how the momentary TCS allows 1st-4th or 1st-3rd shifting, how the TCIL flashes on faults, and how the Transmission Range (TR) sensor works as a voltage divider that also houses the start, backup lamp, and 4x4 low-neutral circuits. Cross-references point to power distribution, engine controls, turn/stop/hazard lamps, and TR sensor testing pages.

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Frequently asked questions

What does the BOO switch do in the E4OD circuit?: The Brake On/Off (BOO) switch sends a signal to the PCM to disengage the torque converter clutch when the brake pedal is depressed. The PCM may ignore this signal if the TP signal is above closed throttle.
What does it mean when the TCIL flashes?: The Transmission Control Indicator Lamp indicates that 4th gear has been disengaged, and may also flash if monitored sensors/actuators or circuits have failed.
What fuses power the E4OD circuit?: Fuse position 13 (15A, hot at all times) and fuse position 17 (10A, hot in start or run) in the fuse panel, shown on pages 13-7 and 13-11.
How does the Transmission Range (TR) sensor work?: It uses a series of step-down resistors acting as a voltage divider; the PCM monitors the voltage corresponding to the manual lever position to determine desired gear and EPC pressure. It also houses the START circuits allowing starting in PARK or NEUTRAL, plus the backup lamp and 4x4 low-neutral sense circuits, which are closed in reverse.
What wire circuit connects the PCM to the TR sensor?: Circuit 359 GY/R runs from PCM pin 46 through C185, S137, C103M/C103F, S146 and C1012 to the TR sensor; circuit 199 LB/Y returns from the TR sensor (pin 3 via C1012) through C103F/C103M and C185 to PCM pin 30.