Case IH 3882 (F-3507-14) - ECU – Engine Control Module (ECM / ECU): 12/24 volt actuator supply 2 is shorted to ground

The Engine Control Module (ECM) has detected a short circuit to ground error at the high side actuator relay with index x = 1. This means that the voltage on the power supply circuit for specific engine actuators has been pulled to ground, either due to a damaged wiring harness touching the chassis or an internal short within the connected actuator itself.

• VESTRUM CVX
• Magnum (265, 290, 310, 340, 380 CVX)
• Maxxum (115, 135, 150)
• Optum (250 CVX, 270)
• Puma (140, 150)
• Steiger (425, 620)
• Austoft 9900
• Axial-Flow (5150, 6150)

1. 1

   Visually inspect the engine wiring harness leading from the ECU to the actuators powered by Supply 2 for chafed insulation, melted wires, or pinch points against the engine block or chassis.

2. 2

   Disconnect the harness at the ECU (Bosch MD1CE101) and use a multimeter to check for continuity to ground on pins 2.08, 4.03, and 4.19.

3. 3

   Disconnect the actuators on this circuit one by one. If the short to ground disappears when a specific actuator is unplugged, that actuator has an internal short.

4. 4

   If the actuators are unplugged and the wire still shows continuity to ground, verify that the wiring harness itself is shorted.

1. 1

   Disconnect Power

   Turn off the machine and disconnect the negative battery terminal to prevent further electrical damage.

2. 2

   Repair Wiring

   If the diagnostic checks revealed a shorted wire, locate the exact point of damage. Splice and solder the broken wire, seal it with heat-shrink tubing, and re-loom the harness, ensuring it is routed away from sharp edges or high-heat sources.

3. 3

   Replace Actuator

   If an actuator tested internally shorted to ground, unbolt and replace the faulty actuator.

4. 4

   ECU Replacement

   If the wiring harness and all connected actuators test perfectly fine, the internal high-side actuator relay within the Bosch MD1CE101 ECU has failed. The ECU will need to be replaced and reprogrammed by a dealer.

5. 5

   Clear Codes

   Reconnect the battery, turn the key to the ON position, and use a diagnostic scan tool (like CNH EST) to clear the inactive 3882 / 3507-14 fault code. Run the engine to verify the code does not return.