What fuses power the E4OD transmission control circuits on this diagram?

Fuse 13, a 15A fuse that is hot in start or run, and fuse 17, a 10A fuse that is hot at all times, both located in the fuse panel (pages 13-3, 13-9, 13-12).

What does the BOO (Brake On/Off) switch do in the E4OD circuit?

The 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. It feeds circuit 511 LG to PCM pin 2 when closed.

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

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

What is the function of the Manual Lever Position (MLP) sensor?

It incorporates 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, and the backup lamp circuits, which close in reverse.

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

Circuit 224 T/W goes to PCM pin 41 (12V, switch closed) and circuit 911 W/LG goes to PCM pin 32 (12V, switch closed); the switch is fed by circuit 640 R/Y through connector C275.

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1994 Ford E4OD Transmission Wiring Diagram (Gasoline) - BOO Switch, MLP Sensor

Ford EVTM page 30-1: E4OD gasoline transmission wiring diagram with BOO switch and TCS

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Wiring diagram for the E4OD gasoline transmission showing the brake on/off switch, transmission control switch and PCM connections.

AI caption July 2017 · Photo 295 of 386

This is a scanned Ford factory-style wiring diagram, page 30-1, covering the E4OD automatic transmission with gasoline engines, marked "94" (1994). It shows the control circuits between the fuse panel and the Powertrain Control Module (PCM). Power feeds come from fuse 13 (15A, hot in start or run) and fuse 17 (10A, hot at all times). The diagram traces circuit 383 R/W through splice S236 to the Brake On/Off (BOO) switch, which sends circuit 511 LG (12V switch closed) to PCM pin 2 to disengage the torque converter clutch when the brake pedal is depressed. Circuit 640 R/Y feeds the Transmission Control Switch (overdrive cancel), a momentary contact switch whose TCIL lamp indicates 4th gear disengagement or circuit faults; circuits 224 T/W and 911 W/LG connect to PCM pins 41 and 32. The Manual Lever Position (MLP) sensor circuit uses 359 GY/R from PCM pin 46 through connectors C185, C103, and C1012, returning on 199 LB/Y to pin 30; a note explains the MLP sensor's voltage-divider design, its role in gear/EPC pressure determination, start-in-Park/Neutral circuits, and backup lamp circuits. Cross-references point to Engine Controls, Power Distribution, Turn/Stop/Hazard Lamps, and switch testing pages.

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Frequently asked questions

What fuses power the E4OD transmission control circuits on this diagram?: Fuse 13, a 15A fuse that is hot in start or run, and fuse 17, a 10A fuse that is hot at all times, both located in the fuse panel (pages 13-3, 13-9, 13-12).
What does the BOO (Brake On/Off) switch do in the E4OD circuit?: The 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. It feeds circuit 511 LG to PCM pin 2 when closed.
What does the TCIL (Transmission Control Indicator Lamp) indicate?: It indicates that 4th gear has been disengaged, and it may also flash if monitored sensors/actuators or circuits have failed.
What is the function of the Manual Lever Position (MLP) sensor?: It incorporates 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, and the backup lamp circuits, which close in reverse.
What wire colors and PCM pins are used for the transmission control switch?: Circuit 224 T/W goes to PCM pin 41 (12V, switch closed) and circuit 911 W/LG goes to PCM pin 32 (12V, switch closed); the switch is fed by circuit 640 R/Y through connector C275.