John Deere 000247.19 – ICU: Missing CCU Messages on Power Train CAN

The fault code indicates a communication breakdown on the Power Train CAN BUS network, specifically that messages from the Chassis Control Unit (CCU), also known as the Engine Module Rear Chassis, are missing. This disruption in the data line between the CCU and other modules is detected by the Instrument Control Unit (ICU) and can lead to reduced machine functionality or render the tractor inoperable.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6M Series
• 6R Series
• 7200
• 7400
• 7600
• 6000 Series

1. 1

   Check the condition of the batteries and alternator, as low or unstable voltage can cause communication issues.

2. 2

   Inspect the Power Train CAN BUS wiring harness for physical damage, chafing, corrosion on connectors, or loose connections, paying close attention to the harness sections connecting to the CCU.

3. 3

   Measure CAN Bus voltages with the key on and engine off. CAN High (yellow wire) and CAN Low (green wire) should both be approximately 2.5 volts when no messages are transmitting.

4. 4

   Measure CAN Bus resistance with the battery disconnected. It should read approximately 60 Ohms between CAN High and CAN Low at the diagnostic connector.

5. 5

   Perform a wiggle test on the CAN bus harness while observing voltage or resistance readings to check for intermittent open or short circuits.

6. 6

   Unplug controllers from the network one by one to see if the voltage returns to normal, which can help isolate a faulty controller pulling the network down.

1. 1

   Record and Clear Codes

   Access the diagnostic trouble codes through the tractor's display and record all active codes. Clear the codes and attempt to restart the machine to see if the 000247.19 fault code immediately returns.

2. 2

   Perform Visual and Electrical Checks

   Follow the diagnostic checks to identify any obvious issues with the wiring or CAN bus network integrity.

3. 3

   Check Terminating Resistors

   Based on the 60 Ohm resistance test, if a resistor is suspected to be faulty (e.g., reading 120 Ohms), locate and replace it.

4. 4

   Isolate the CCU

   If the wiring and terminating resistors appear to be in good condition, disconnect the CCU from the CAN bus and re-check the bus voltages and resistance. If the network returns to a healthy state with the CCU disconnected, the CCU is likely the source of the problem.

5. 5

   Replace Faulty Component

   Repair or replace a damaged section of the wiring harness, replace a faulty terminating resistor, or replace the CCU if it is determined to be faulty.