Case IH 17654 (F-518402-04) - ECU – Engine Control Module (ECM): ECU 12/24 volt actuator supply 8 is shorted to battery voltage

The Engine Control Module (ECM) has detected unintended battery voltage on the actuator supply 8 circuit. This specific supply circuit corresponds to pins 3.45 and 3.46 on the MD1CE101 ECU.

• VESTRUM CVX
• Magnum (CVT/CVX)
• Maxxum (CVX)
• Optum (CVX)
• Puma (CVX, X)
• Steiger
• Quadtrac
• Vestrum
• Farmlift
• Axial-Flow 5150
• Axial-Flow 6150
• Axial-Flow 7150
• Axial-Flow 7250
• Axial-Flow 8250
• Axial-Flow 9250
• Patriot 3250
• Patriot 4450
• Case IH Graders
• Case IH Wheel Loaders

1. 1

   Turn the key OFF and disconnect the battery to prevent further electrical damage.

2. 2

   Locate the Bosch MD1CE101 ECU and disconnect Connector 3.

3. 3

   Inspect the wiring harness at pins 3.45 and 3.46. According to CNH wiring diagrams, pin 3.45 is designated for 'Cabin & dashboard supply 1' (O_V_DBS1).

4. 4

   Check the harness for chafing, melted insulation, or pinched wires between the ECU and the cabin/dashboard interface that could cause the circuit to short to a constant battery voltage source.

5. 5

   With the ECU disconnected, turn the key ON and use a multimeter to measure the voltage at pins 3.45 and 3.46 on the harness side. If battery voltage is present, the short to power is located within the wiring harness.

6. 6

   If the harness tests good (no voltage present when disconnected) and all related cabin supply relays/components test normal, the short is likely internal to the Bosch MD1CE101 ECU.

1. 1

   Disconnect the negative battery terminal.

   Disconnect the negative battery terminal.

2. 2

   If the diagnostic tests isolate the short to the wiring harness, trace the wires from ECU pins 3.45 and 3.46 toward the cabin/dashboard supply interface.

   If the diagnostic tests isolate the short to the wiring harness, trace the wires from ECU pins 3.45 and 3.46 toward the cabin/dashboard supply interface.

3. 3

   Repair or replace the damaged section of the wiring harness.

   Repair or replace the damaged section of the wiring harness. Ensure all repaired wires are properly insulated with heat shrink and routed away from sharp frame edges or heat sources.

4. 4

   If the wiring harness is completely intact and the short is internal to the ECU, the Bosch MD1CE101 ECU must be replaced or sent to a specialized module repair facility.

   If the wiring harness is completely intact and the short is internal to the ECU, the Bosch MD1CE101 ECU must be replaced or sent to a specialized module repair facility.

5. 5

   Reconnect the ECU and the battery.

   Reconnect the ECU and the battery.

6. 6

   Connect the Case IH Electronic Service Tool (EST) to the diagnostic port, clear the inactive fault codes, and cycle the key to verify that code 17654 does not return.

   Connect the Case IH Electronic Service Tool (EST) to the diagnostic port, clear the inactive fault codes, and cycle the key to verify that code 17654 does not return.