Case IH 14300 - ICU – Electronic Park Lock (EPL) Controller / ICU: Electronic Park Lock (EPL) – mismatch between CAN and direct frequency input value

This code indicates a discrepancy in the speed or frequency data being reported to the Electronic Park Lock system. The controller is receiving conflicting information between the digital signal broadcasted over the CAN bus network and the hardwired direct frequency input signal (typically generated by a transmission speed sensor or radar unit).

• VESTRUM CVX
• Puma 140
• Puma 165
• Puma 175
• Puma 180
• Puma 185
• Puma 195
• Puma 210
• Puma 215
• Puma 225 CVXDrive
• Magnum series
• Vestrum 100
• Vestrum 110
• Vestrum 120
• Vestrum 130
• Maxxum series

1. 1

   Check for Related Codes: Look for accompanying codes that might isolate the issue (e.g., 14301 or 14304).

2. 2

   Wiring and Connector Inspection: Inspect the wiring harness and connectors between the transmission speed sensors, the CAN bus network, and the EPL controller for corrosion, chafed wires, or loose pins.

3. 3

   Diagnostic Menu Check: Access the tractor's 'H menu' diagnostics (XA module, menu H2) using the diagnostic test switch (Special Tool #380000843) to view stored Electronic Park Lock calibration values and sensor data.

1. 1

   Isolate the Faulty Circuit

   Using a multimeter, test the continuity and voltage of the direct frequency input circuit from the transmission speed sensor/radar to the EPL controller.

2. 2

   Repair Wiring

   If a short or open circuit is found in the harness, repair or replace the damaged wiring and connectors.

3. 3

   Replace the Sensor

   If the wiring is intact but the direct frequency signal is erratic or missing, replace the transmission speed sensor or radar unit providing the input.

4. 4

   Replace the EPL Controller

   If the sensor and wiring are verified as good, but the module still cannot reconcile the CAN data with the direct input, the Electronic Park Lock actuator/controller itself may have failed internally and must be replaced.

5. 5

   Recalibrate the System

   After repairing the wiring or replacing any components, you must perform the Electronic Park Lock calibration procedure. This is done by entering the diagnostic mode, navigating to the XA module, and selecting menu H1 (Calibration procedures).