How To Reset Eaton Fuller Automatic Transmission

An Eaton Fuller automated manual transmission (AMT) is a complex system that relies on electronic controls and sensors to operate efficiently. At times, these systems may encounter issues that necessitate a reset. This article outlines the procedure to reset an Eaton Fuller automatic transmission.

Understanding the Need for a Reset

Before proceeding with a reset, it is crucial to understand when such an action is appropriate. A reset is typically performed when the transmission exhibits unusual behavior, such as:

• Erratic shifting
• Failure to engage a gear
• Display of fault codes
• Experiencing a limp mode

In these scenarios, a reset can sometimes resolve the issue by clearing the transmission's memory and allowing it to relearn operating parameters. However, it is imperative to accurately diagnose the root cause of the problem. A reset should not be considered a substitute for proper diagnosis and repair. It is always recommended to consult with a qualified technician to determine if a reset is the correct course of action.

Methods for Resetting an Eaton Fuller Automatic Transmission

Several methods can be employed to reset an Eaton Fuller AMT, each with varying levels of complexity. These range from simple procedures that can be performed without specialized tools to more advanced techniques that require diagnostic software. The following methods are commonly used:

Method 1: Battery Disconnect

This is the simplest and most common method for performing a reset. It involves disconnecting the vehicle's battery to remove power from the transmission control module (TCM), effectively clearing its memory.

1. Locate the vehicle's battery. Typically, this is found under the hood, in a side compartment, or under the seat.
2. Ensure the vehicle is turned off and the ignition key is removed.
3. Using a wrench, disconnect the negative (-) battery cable first.
4. Then, disconnect the positive (+) battery cable.
5. Allow the vehicle to sit for at least 15 minutes. This ensures that any residual power in the TCM is fully discharged.
6. Reconnect the positive (+) battery cable first.
7. Reconnect the negative (-) battery cable.
8. Tighten the cable clamps securely.
9. Start the vehicle and allow the transmission to cycle through its gears. This allows the TCM to relearn the transmission's operating parameters.

Caution: When working with batteries, it's essential to wear appropriate safety gear, such as gloves and eye protection. Be careful not to short-circuit the battery terminals. Also, be aware that disconnecting the battery may reset other electronic systems in the vehicle, such as the radio and clock, requiring them to be reprogrammed.

Method 2: Key-On Sequence Reset

This method utilizes a specific sequence of key turns and pedal presses to initiate a reset within the transmission's electronic control system. This method may vary slightly depending on the specific model of the Eaton Fuller transmission and the vehicle it's installed in. Consult the vehicle's service manual for precise instructions.

1. Ensure the vehicle is turned off and the parking brake is engaged.
2. Turn the ignition key to the "ON" position, but do not start the engine.
3. Wait for approximately 10 seconds.
4. Fully depress the accelerator pedal and hold it down.
5. Turn the ignition key to the "OFF" position.
6. Release the accelerator pedal.
7. Wait for approximately 10 seconds.
8. Turn the ignition key to the "ON" position, but do not start the engine.
9. Observe the transmission's indicator lights. Some models may display a specific sequence to indicate that the reset has been initiated.
10. Start the vehicle and allow the transmission to cycle through its gears.

Method 3: Using Diagnostic Software (ServiceRanger)

For more advanced diagnostics and resets, Eaton provides proprietary diagnostic software called ServiceRanger. This software allows technicians to access detailed information about the transmission's performance, including fault codes, sensor readings, and calibration settings. A reset can be performed using this software, which provides a more controlled and specific approach compared to the battery disconnect or key-on sequence methods.

1. Connect the diagnostic tool to the vehicle's diagnostic port (typically a J1939 connector).
2. Launch the ServiceRanger software on a computer.
3. Select the appropriate vehicle and transmission model from the software's menu.
4. Navigate to the "Fault Codes" or "Diagnostic" section of the software.
5. Identify any active fault codes. Clear these fault codes before proceeding with the reset.
6. Navigate to the "Configuration" or "Calibration" section of the software.
7. Locate the "Reset TCM" or "Reset Transmission" function.
8. Follow the on-screen instructions to initiate the reset. This may involve confirming the action and waiting for the process to complete.
9. After the reset is complete, perform a transmission calibration, as prompted by the software. This ensures that the TCM relearns the transmission's operating parameters correctly.
10. Disconnect the diagnostic tool and start the vehicle. Allow the transmission to cycle through its gears.

Note: Using ServiceRanger requires specialized training and knowledge. This method is typically performed by qualified technicians with access to the software and appropriate diagnostic equipment. Improper use of diagnostic software can potentially damage the transmission or other vehicle systems.

Post-Reset Procedures

After performing any of the reset methods, it is essential to perform a "relearn" or "calibration" procedure. This allows the TCM to re-establish its understanding of the transmission's characteristics and optimize its shifting strategy. The specific relearn procedure may vary depending on the transmission model, but it typically involves driving the vehicle through a series of accelerations and decelerations, allowing the transmission to shift through all of its gears. The transmission will then adapt its shift patterns based on the learned data.

Consult the vehicle's service manual or Eaton Fuller's documentation for the specific relearn procedure recommended for your transmission model. Following this procedure is crucial to ensure optimal transmission performance and longevity.

Troubleshooting After a Reset

If, after performing a reset, the transmission continues to exhibit issues, further investigation is warranted. This may involve checking the following:

• Fluid Level and Condition: Ensure the transmission fluid is at the correct level and is free of contaminants. Low or contaminated fluid can cause shifting problems.
• Wiring and Connectors: Inspect the wiring harness and connectors for any signs of damage or corrosion. Damaged wiring can disrupt communication between the TCM and other components.
• Sensors and Actuators: Check the sensors and actuators for proper function. Faulty sensors can provide inaccurate information to the TCM, leading to shifting problems.
• Fault Codes: Scan the TCM for any new fault codes that may have appeared after the reset. These codes can provide clues to the underlying problem.

If these basic checks do not reveal the cause of the problem, it is recommended to consult with a qualified transmission technician for further diagnosis and repair.

Practical Advice

While this guide provides a general overview of how to reset an Eaton Fuller automatic transmission, always remember to consult the vehicle's specific service manual for the most accurate and up-to-date information. If unsure about any procedure, seek assistance from a qualified technician. Preventive maintenance, such as regular fluid changes, can help prevent transmission problems and reduce the need for resets.