What does the BOO (Brake On/Off) switch do on the 1995 Bronco E4OD?

It 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 (throttle position) signal is above closed throttle. The switch is closed with the brake pedal depressed and feeds circuit 511 LG to PCM pin 2.

Which fuses power the E4OD transmission circuits on the 1995 Bronco?

Fuse 13 (15A, hot at all times) powers the brake on/off switch circuit via wire 383 R/W, and fuse 17 (10A, hot in start or run) powers the transmission control switch via wire 640 R/Y. See fuse panel pages 13-7 and 13-11.

What does the TCIL (Transmission Control Indicator Lamp) mean?

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

How does the Transmission Range (TR) sensor work?

It uses a series of step-down resistors as a voltage divider; the PCM monitors the voltage corresponding to the manual lever position to determine desired gear and EPC pressure. The sensor also houses the START circuits so the vehicle can be started in PARK or NEUTRAL, plus the backup lamp and 4X4 low-neutral sense circuits, which are closed in reverse.

What wire colors and PCM pins are used for the E4OD transmission control switch?

The switch receives 640 R/Y (12V in start or run) and outputs circuit 224 T/W to PCM pin 41 and 911 W/LG to PCM pin 32 through connectors C275M/C275F and C202F/C202M.

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1995 Ford Bronco E4OD Transmission Wiring Diagram (EVTM Page 30-1)

1995 Bronco E4OD transmission wiring diagram page 30-1

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Wiring diagram for the 1995 Bronco E4OD transmission showing PCM, transmission range sensor, and color-coded circuits.

AI caption December 2011 · Photo 997 of 1799

This is page 30-1 of the 1995 Ford Bronco Electrical and Vacuum Troubleshooting Manual (EVTM), showing the wiring schematic for the E4OD automatic transmission control circuits. It traces power from the fuse panel: fuse 13 (15A, hot at all times) through circuit 383 R/W and 10 LG/R to the Brake On/Off (BOO) switch, which outputs circuit 511 LG to PCM pin 2; and fuse 17 (10A, hot in start or run) through circuit 640 R/Y to the Transmission Control Switch (with TCIL indicator lamp), feeding circuits 224 T/W and 911 W/LG to PCM pins 41 and 32. The right side shows the Transmission Range (TR) sensor wiring: circuit 359 GY/R from PCM pin 46 through connectors C185, C103M/F and C1012, with return circuit 199 LB/Y to PCM pin 30. Explanatory callouts describe the BOO switch's role in torque converter clutch disengagement, the TCIL's function of indicating 4th gear disengagement or flashing for faults, the momentary transmission control switch enabling 1st-4th or 1st-3rd shifting, and the TR sensor's voltage-divider design that also houses START and backup lamp circuits. Cross-references point to pages 13-7/13-11 (power distribution), 90-1/90-2 (turn/stop/hazard lamps), 93-1 (backup lamps), 149-9 (switch testing), and component location grids.

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Frequently asked questions

What does the BOO (Brake On/Off) switch do on the 1995 Bronco E4OD?: It 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 (throttle position) signal is above closed throttle. The switch is closed with the brake pedal depressed and feeds circuit 511 LG to PCM pin 2.
Which fuses power the E4OD transmission circuits on the 1995 Bronco?: Fuse 13 (15A, hot at all times) powers the brake on/off switch circuit via wire 383 R/W, and fuse 17 (10A, hot in start or run) powers the transmission control switch via wire 640 R/Y. See fuse panel pages 13-7 and 13-11.
What does the TCIL (Transmission Control Indicator Lamp) mean?: It indicates that 4th gear has been disengaged, and it may also flash if monitored sensors/actuators or circuits have failed.
How does the Transmission Range (TR) sensor work?: It uses a series of step-down resistors as a voltage divider; the PCM monitors the voltage corresponding to the manual lever position to determine desired gear and EPC pressure. The sensor also houses the START circuits so the vehicle can be started in PARK or NEUTRAL, plus the backup lamp and 4X4 low-neutral sense circuits, which are closed in reverse.
What wire colors and PCM pins are used for the E4OD transmission control switch?: The switch receives 640 R/Y (12V in start or run) and outputs circuit 224 T/W to PCM pin 41 and 911 W/LG to PCM pin 32 through connectors C275M/C275F and C202F/C202M.