New Holland 4197 – EHC: Rear EHR No. 4 Motor Mode Switch Faulty

The Electronic Hitch Control (EHC) module has detected an electrical problem, such as an open circuit, short circuit, or implausible signal, with the switch responsible for engaging the motor mode on the fourth rear hydraulic remote. Motor mode allows for continuous, non-timed hydraulic flow to power implements. Failure of this switch will affect the proper operation of the continuous flow system for this circuit.

• TM120
• TM130
• TM140
• TM155
• TM175
• TM190

1. 1

   Check for other active fault codes, particularly those related to the EHR system or power supply

2. 2

   Inspect the wiring harness and connectors associated with the rear remote valve switches for signs of damage, corrosion, or loose connections

3. 3

   Verify the power supply by ensuring the battery is fully charged and all main power and ground connections to the chassis are clean and tight

4. 4

   Test the switch functionality using a multimeter to check for proper continuity and resistance when the switch is operated

1. 1

   Prepare machine

   Ensure the tractor is on level ground, the parking brake is engaged, and the engine is turned off.

2. 2

   Locate and access switch

   Locate the switch bank controlling the rear remote valves on the armrest or control console. Remove necessary panels or covers to access the switch assembly.

3. 3

   Remove faulty switch

   Carefully disconnect the electrical connector from the faulty switch assembly and remove it from its mounting.

4. 4

   Install new switch

   Install the replacement switch, ensuring it is securely seated, and reconnect the electrical connector.

5. 5

   Reassemble and test

   Reinstall any removed panels or covers. Start the tractor, clear active fault codes, and test the functionality of the number four rear remote (including motor mode) to verify the repair.