Case IH F76 – Transmission Controller (Transmission/EDC): Swapped Engine Torque/RPM Sensor With Either The Mid Or Output Speed Sensors

The transmission controller has detected an implausible signal combination, determining that the wiring harness connectors for the Engine Torque/RPM sensor have been physically plugged into either the Transmission Mid Speed Sensor or the Transmission Output Speed Sensor by mistake.

• MXM
• MXM 120
• MXM 130
• MXM 140
• MXM 155
• MXM 175
• MXM 190

1. 1

   Trace the wiring harness routing to the transmission speed sensors and the engine torque/RPM sensor

2. 2

   Check the wire colors and connector pinouts against the OEM wiring diagram to verify which connector belongs to which sensor

3. 3

   Inspect the pins inside the connectors to ensure they were not bent or damaged when forced onto the wrong sensor

1. 1

   Power Down

   Turn off the tractor and disconnect the battery ground to prevent electrical shorts.

2. 2

   Locate Sensors

   Locate the Engine Torque/RPM sensor, the Transmission Mid Speed Sensor, and the Transmission Output Speed Sensor on the transmission housing.

3. 3

   Swap Connectors

   Unplug the incorrectly routed wiring harness connectors and plug them into their correct, respective sensors.

4. 4

   Clear Codes & Calibrate

   Reconnect the battery and turn the key switch to the 'ON' position. Perform a Transmission Calibration by setting the engine speed to 1200 ERPM and using the High and Low range buttons until 'CAL' appears on the transmission display.

5. 5

   Test Drive

   Operate the tractor to ensure the transmission shifts correctly and that codes F76, F77, or F78 do not return.