What does the BOO switch do in the 1996 E4OD transmission control circuit?

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

Which fuses power the E4OD transmission controls on this diagram?

Fuse 13 (15A, hot at all times) and fuse 17 (10A, hot in start or run) in the fuse panel, referenced on pages 13-3, 13-12, and 13-16.

What does the Transmission Control Switch (TCS) do?

It is a momentary contact switch that signals the PCM to allow automatic shifts from 1st through 4th gear or from 1st through 3rd gears.

What does the TCIL indicator show?

It indicates that 4th gear has been disengaged, and may also flash if monitored sensors/actuators or circuits have failed.

What wire colors and circuit numbers are used in this E4OD circuit?

Circuit 363 R/W (red/white), 640 R/W, 511 LG (light green), 224 T/W (tan/white), and 911 W/LG (white/light green), running through connectors C279, C275F/M, C202F/M, C185 and C1027.

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1996 Ford E4OD Transmission Controls Wiring Diagram (Gasoline) - Page 30-1

96 Bronco 30-1 Transmission Controls (E4OD) Gasoline wiring diagram: BOO switch, transmission control switch, turn/hazard lamps

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E4OD transmission controls wiring diagram for 1996 Ford Bronco gasoline showing BOO switch and transmission control switch circuits.

AI caption July 2017 · Photo 257 of 386

This is page 30-1 of a 1996 Ford factory wiring diagram (EVTM) covering Transmission Controls for the E4OD automatic transmission in gasoline-engine trucks. The diagram shows power feeds from the fuse panel: fuse 13 (15A, hot at all times) and fuse 17 (10A, hot in start or run), with references to Power Distribution pages 13-15 and 13-19. It traces circuit 363 (R/W wire) through splice S238 to the Brake On/Off (BOO) switch, which closes when the brake pedal is depressed and signals the PCM to disengage the torque converter clutch (circuit 511 LG). Circuit 640 (R/W) through splice S215 powers the Transmission Control Switch (TCS), a momentary switch that allows shifts 1st–4th or 1st–3rd, and the TCIL indicator, which shows 4th gear disengagement and can flash for monitored sensor/actuator faults. Wiring runs through connectors C279, C275F/C275M, C202F/C202M, C185 and C1027 to the Powertrain Control Module (solid state), with wire colors and circuit numbers (363 R/W, 640 R/W, 511 LG, 224 T/W, 911 W/LG) labeled. Footnotes indicate applicability differences for 5.8L over 8500 GVW, 7.5L over 14000, gas under 8500 GVW, and California/Super Duty variations.

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Frequently asked questions

What does the BOO switch do in the 1996 E4OD transmission control circuit?: The Brake On/Off (BOO) switch, closed with the brake pedal depressed, sends a signal to the PCM to disengage the torque converter clutch. The PCM may ignore this signal if the TP signal is above closed throttle.
Which fuses power the E4OD transmission controls on this diagram?: Fuse 13 (15A, hot at all times) and fuse 17 (10A, hot in start or run) in the fuse panel, referenced on pages 13-3, 13-12, and 13-16.
What does the Transmission Control Switch (TCS) do?: It is a momentary contact switch that signals the PCM to allow automatic shifts from 1st through 4th gear or from 1st through 3rd gears.
What does the TCIL indicator show?: It indicates that 4th gear has been disengaged, and may also flash if monitored sensors/actuators or circuits have failed.
What wire colors and circuit numbers are used in this E4OD circuit?: Circuit 363 R/W (red/white), 640 R/W, 511 LG (light green), 224 T/W (tan/white), and 911 W/LG (white/light green), running through connectors C279, C275F/M, C202F/M, C185 and C1027.