Case IH 2754 (519631.19) - DEC – Electronic Park Brake (EPL) Controller: CAN 1 - Epl_StsNeg Error on CAN1

Negative status, missing message, or data error being received over the Controller Area Network 1 (CAN 1) bus regarding the Electronic Park Brake system.

• MAXXUM T4E
• VESTRUM CVX
• Puma Series (including Puma 165, 180, 195, 210, 225 CVX)
• Magnum Series (AFS Connect models)

1. 1

   Inspect the CAN 1 High and CAN 1 Low connections at the EPL module and the ECU (circuits 6415 and 6416).

2. 2

   Check the Electronic Park Brake (EPL) Controller wire harnesses (e.g., electrical schematic frame 06) for physical damage, chafing, or screen braid integrity.

3. 3

   Verify there is no short circuit to ground, short circuit to the power supply, or open circuit on the EPL module pins (such as pins A4 or C7).

1. 1

   Access diagnostics

   Access the diagnostic menu via the ADIC (Advanced Diagnostic Instrument Cluster) or connect the Electronic Service Tool (EST) to the diagnostic connector.

2. 2

   Clear historical errors

   Clear the historical errors to see if the Epl_StsNeg fault is active or stored.

3. 3

   Inspect connectors

   Disconnect the EPL Controller and inspect the harness connectors for corrosion or pushed-out pins.

4. 4

   Test continuity

   Perform a continuity test on the CAN 1 HI and CAN 1 LO wires between the EPL controller and the main ECU.

5. 5

   Repair wiring

   Repair any broken wires or replace the damaged section of the CAN harness.

6. 6

   Replace EPL Controller

   If the wiring is fully intact and terminating resistance is correct (typically 60 ohms across the CAN bus), the EPL Controller itself may have an internal failure and require replacement and recalibration.