The 5r110 is a heavy-duty transmission that is used in a variety of Ford vehicles, including the F-250, F-350, F-450, and F-550. It is a six-speed automatic transmission that is known for its durability and reliability.
What is an External Wiring Harness?
An external wiring harness is a set of wires that connect various components of a transmission to the vehicle’s electrical system. The external wiring harness for the 5r110 transmission includes a range sensor, a transmission fluid temperature sensor, a shift solenoid, and a pressure control solenoid, among other components.
Range Sensor
The range sensor is responsible for telling the transmission which gear to engage. It is connected to the external wiring harness and is located on the driver’s side of the transmission. If the range sensor fails, the transmission may not shift properly or may not engage at all.
Transmission Fluid Temperature Sensor
The transmission fluid temperature sensor is responsible for monitoring the temperature of the transmission fluid. It is located on the passenger’s side of the transmission and is connected to the external wiring harness. If the transmission fluid temperature sensor fails, the transmission may shift erratically or not shift at all.
Shift Solenoid
The shift solenoid is responsible for controlling the hydraulic pressure that engages the transmission’s clutches and gears. There are four shift solenoids in the 5r110 transmission, and they are all connected to the external wiring harness. If a shift solenoid fails, the transmission may not shift properly or may not engage at all.
Pressure Control Solenoid
The pressure control solenoid is responsible for controlling the hydraulic pressure in the transmission. It is connected to the external wiring harness and is located on the driver’s side of the transmission. If the pressure control solenoid fails, the transmission may shift erratically or not shift at all.
External Wiring Harness Diagram
The following diagram shows the external wiring harness for the 5r110 transmission:
| Pin | Description |
| 1 | Shift Solenoid A |
| 2 | Shift Solenoid B |
| 3 | Shift Solenoid C |
| 4 | Shift Solenoid D |
| 5 | Pressure Control Solenoid |
| 6 | Range Sensor Signal |
| 7 | Transmission Fluid Temperature Sensor Signal |
| 8 | Ground |
| 9 | Power |
Frequently Asked Questions
1. How do I know if the external wiring harness is failing?
If the transmission is shifting erratically or not shifting at all, it could be a sign that the external wiring harness is failing. You may also notice warning lights on your dashboard, such as the check engine light or the transmission temperature light.
2. Can I replace the external wiring harness myself?
Replacing the external wiring harness can be a complex and time-consuming process. It is recommended that you have an experienced mechanic perform the replacement.
3. How much does it cost to replace the external wiring harness?
The cost of replacing the external wiring harness can vary depending on the make and model of your vehicle, as well as the mechanic you choose to perform the replacement. On average, the cost can range from $500 to $1500.
4. How long does it take to replace the external wiring harness?
The time it takes to replace the external wiring harness can vary depending on the complexity of the job and the mechanic performing the replacement. On average, it can take between 4 to 8 hours.
5. Can I prevent the external wiring harness from failing?
Performing regular maintenance on your vehicle, such as changing the transmission fluid and filter, can help prevent the external wiring harness from failing prematurely. It is also important to address any transmission issues as soon as they arise.
