Case IH 55010 – ECU / Transmission Controller: Illegal operation. Incorrect map structure (55010) / Internal Output Enable Latch Failed (56091)

There is a discrepancy in the query: ECU code 55010 indicates 'Illegal operation. Incorrect map structure' or 'Unknown entry'. The description 'Internal output enable latch failed' belongs to TRANS 56091, indicating the output enable relay internal to the transmission controller has failed closed.

• STX Steiger
• STX Series Tractors

1. 1

   For latch failure (TRANS 56091): Visually inspect the transmission controller and surrounding components for physical damage or loose connections.

2. 2

   For latch failure: Ensure the transmission controller is properly communicating with the instrumentation.

3. 3

   For latch failure: Access the Trans View and Trans Setup menus on the cab display to retrieve, verify, and attempt to clear the active fault codes.

4. 4

   For latch failure: Verify that the Armrest (ARM) controllers are properly calibrated, as this can interfere with controller outputs.

1. 1

   Disconnect battery

   Disconnect battery power to the machine.

2. 2

   Disconnect harnesses

   Disconnect the wiring harnesses from the Transmission Controller.

3. 3

   Replace controller

   Remove and replace the Transmission Controller.

4. 4

   Reconnect components

   Reconnect the harnesses and battery power.

5. 5

   Calibrate controller

   Perform a full transmission controller calibration using the Trans Setup menu, which is required whenever the controller is changed.

6. 6

   Re-flash ECU

   For the ECU 55010 'Incorrect map structure' code, a dealer software re-flash is typically required.