Case IH R36 – Central Controller (XCM): EHR Control Unit 3 Full Flow Switch Error

This code indicates a malfunction or communication failure involving the full flow switch on the Electro-Hydraulic Remote (EHR) Valve 3. The EHR system electronically regulates the hydraulic flow to the rear remotes and hitch.

• MXM
• Case IH MXM Series
• MXM 120
• MXM 130
• MXM 135
• MXM 140
• MXM 150
• MXM 155
• MXM 165
• MXM 175
• MXM 180
• MXM 190
• Case IH Puma Series
• Case IH Steiger Series

1. 1

   Turn the key off, disconnect the battery, and disconnect the connectors at EHR Valve 3. Use a multimeter to check for open circuits, short-to-ground conditions, or high resistance in the wiring harness between EHR Valve 3 and the Central Controller (XCM).

2. 2

   Inspect the EHR Valve 3 full flow switch and solenoid for physical damage, corrosion, or loose connector pins.

3. 3

   Check the EHR lever position sensor for erratic voltage readings, as a failing potentiometer in the armrest control lever can send implausible signals to the valve.

4. 4

   Verify that the hydraulic charge pressure and system pressure are within specification, as low pilot pressure can sometimes trigger flow switch errors.

1. 1

   Power Down

   Park the tractor on a level surface, lower all implements to the ground, turn off the engine, and disconnect the battery.

2. 2

   Access the Valve Block

   Locate the rear Electro-Hydraulic Remote (EHR) valve stack at the rear of the tractor. Identify Valve 3.

3. 3

   Wiring Repair

   If the diagnostic checks revealed a short or open circuit, repair the wiring harness or replace the damaged connector pigtail.

4. 4

   Component Replacement

   If the wiring is intact but the switch/valve fails testing, replace the EHR Valve 3 assembly. If the armrest lever potentiometer was found to be the culprit, replace the lever switch assembly in the cab armrest.

5. 5

   Reassembly

   Reconnect all electrical connections and the battery.

6. 6

   System Calibration

   Anytime a PWM solenoid valve, potentiometer, or EHR component is replaced, or if a mechanical repair is effected, a Transmission/EDC Calibration must be performed. Enter the tractor's H-Menu (Diagnostic/Calibration mode), navigate to the ARM (armrest/remotes) calibration section, cycle the EHR levers as prompted by the display, and turn off the key and wait 30 seconds to save the calibration to the non-volatile memory before restarting the tractor.