New Holland ENG 1053 – ENGINE controller (EDC): CAN Bus Communication: CM1BC Timed Out

The Engine Control Unit (ECU) has lost communication with the Body Computer or Vehicle Control Module (VCM) over the CAN bus network for a specific message frame known as "CM1BC". The ECU monitors received CAN messages for timeouts. When the CM1BC message is not received within the expected timeframe (typically 5 seconds), this fault is triggered.

• Skid Steer Loaders (SSL)
• L220
• Compact Track Loaders (CTL)
• SR175
• B90B Backhoe Loader
• B100B Backhoe Loader

1. 1

   Check the installation and proper connection of both the Engine Control Unit (EDC) and the Instrument Cluster / Body Computer to the CAN vehicle network

2. 2

   Inspect the CAN cables between the Body Computer and the Engine ECU for disconnected connectors, broken wires, or chafing

3. 3

   Test the CAN bus wiring harness for short circuits (CAN High to Ground, CAN Low to Ground, or CAN High to CAN Low)

4. 4

   Verify the correct operating conditions and CAN configuration of the CAN controller within the Body Computer

1. 1

   Key Off and Disconnect

   Turn the machine off and disconnect the battery to prevent electrical spikes during testing.

2. 2

   Visual Inspection

   Locate the main wiring harness connecting the Vehicle Control Module/Body Computer to the Engine ECU. Visually inspect for pinched wires, rodent damage, or rubbed-through insulation.

3. 3

   Connector Maintenance

   Disconnect the harness at the Engine ECU and the Body Computer. Inspect the pins for corrosion, moisture, or pushed-back terminals. Clean with contact cleaner and apply dielectric grease if necessary.

4. 4

   Continuity and Resistance Testing

   Measure the resistance across the CAN High and CAN Low pins at the diagnostic port. A healthy CAN bus should read approximately 60 ohms (indicating both 120-ohm terminating resistors are intact). Perform a continuity test on the specific CAN wires from the Body Computer to the Engine ECU.

5. 5

   Repair Wiring

   If a break or short is found in the harness, repair the damaged section of the wire using OEM-approved splicing methods, or replace the affected harness section.

6. 6

   Module Configuration/Replacement

   If the wiring and terminating resistors test perfectly, the fault lies within a defective CAN controller in either the Body Computer or the Engine ECU. The Body Computer's CAN configuration should be verified via a dealer diagnostic tool (like CNH EST). If a module has internally failed, replace the module and flash it with the correct machine dataset.

7. 7

   Clear Codes

   Reconnect the battery, turn the key on, and use a diagnostic tool to clear the DTCs and verify the CM1BC message is now being received.