John Deere 002035.09 – ICU: CAN BUS Message Fault in Main Control Module (TIQ)

A communication failure has occurred on the CAN bus, indicating that a primary controller (typically the Instrument Control Unit) is not receiving expected data messages from another module, such as the Hitch Control Unit (HCU), Hitch Valve Controller (HV1), or Vehicle Load Center (VLC). The .09 Failure Mode Identifier (FMI) signifies an abnormal update rate, meaning messages are missing or delayed, which can lead to reduced functionality or improper machine operation.

• 7185J
• 7195J
• 7205J
• 7210J
• 7225J
• 7630
• 7720
• 7730
• 7820
• 7830
• 7920
• 7930
• 9230
• 9330
• 9430
• 9530
• 9630
• 317G
• 6000 Series
• 6010 Series
• 210K
• 318G
• 903K
• 909K
• 953K

1. 1

   Restart the machine to see if a temporary communication glitch clears the diagnostic trouble code

2. 2

   Inspect fuses related to the control units, specifically checking fuse F30 for HCU communication, as well as F15 and F35

3. 3

   Visually inspect the wiring harness and all connectors between the ICU and the HCU for any signs of damage, corrosion (e.g., from heavy rain as reported on a 317G), moisture intrusion, or loose connections

4. 4

   Check the battery and alternator for low or unstable system voltage, damage, debris, or loose connections

1. 1

   Perform preliminary checks

   Restart the machine, check fuses (F30, F15, F35), and inspect wiring and battery voltage.

2. 2

   Connect diagnostic tools

   If the issue persists, connect John Deere Service ADVISOR to the machine's diagnostic port to read detailed information from the CAN bus system.

3. 3

   Test CAN bus wiring

   Perform targeted tests on the CAN bus wiring, checking for continuity, shorts to power, and shorts to ground between the ICU and HCU.

4. 4

   Test HCU power and function

   Test the Hydraulic Control Unit (HCU) to ensure it is receiving power and functioning correctly.

5. 5

   Repair or replace faulty components

   Based on diagnostic findings, repair damaged wires or connector pins, or replace the entire HCU module if it has failed.

6. 6

   Program and calibrate new HCU

   If the HCU was replaced, have a certified dealer program and calibrate the new module to work with the specific machine.