Case IH 4190 – EHR (Electronic Hydraulic Remote) Controller: Rear remote no. 1 - no communications

The main vehicle controller is no longer receiving CAN bus communication messages from the Electronic Hydraulic Remote (EHR) valve number 1.

• Maxxum
• Steiger T4B
• MAXXUM T4E
• VESTRUM CVX
• Magnum
• Case IH Magnum
• Case IH Puma
• Case IH Steiger

1. 1

   Verify the integrity of the CAN bus network leading to the rear remote stack

2. 2

   Inspect the electrical connector at the Rear Remote No. 1 EHR valve (often labeled X307) for pushed pins, corrosion, or moisture

3. 3

   Check the wiring harness for chafing, breaks, or shorts to ground/power between the EHR module and the valve

4. 4

   If the harness and connectors test good, evaluate the internal electronics of the EHR valve itself

1. 1

   Inspect the Connection

   Locate Rear Remote Valve No. 1 at the rear hydraulic stack. Disconnect the electrical harness and inspect the pins. Clean with contact cleaner if necessary and reconnect.

2. 2

   Test the Harness

   Using a multimeter, verify power, ground, and CAN High/CAN Low continuity from the main controller harness to the valve connector.

3. 3

   Replace the Valve

   If wiring is intact and communication cannot be established, the EHR valve must be replaced.

4. 4

   Clear Codes and Calibrate

   After rectifying the wiring or replacing the valve, use the Electronic Service Tool (EST) or the tractor's diagnostic monitor to clear the fault code.

5. 5

   Spool Calibration

   Perform the EHR spool calibration procedure via the tractor's display before normal operation can resume.