Case IH 1044-05 - UCM – ABS Module / Hydraulic Control Unit (HCU): Electro-hydraulic backup pump current low

The system has detected an open circuit or abnormally low current draw in the electro-hydraulic backup pump motor circuit.

• MAGNUM AFS Connect
• Navistar/International TerraStar

1. 1

   Perform a Hydraulic Control Unit Circuit Test

2. 2

   Check for a bad connection at the hydraulic pump motor

3. 3

   Check for a defective motor driver

4. 4

   Check for a defective motor

5. 5

   Check for a defective ABS module

1. 1

   Proceed to the Hydraulic Control Unit Circuit Test

   Isolate the electrical fault.

2. 2

   Inspect the wiring harness and connectors at the hydraulic pump motor

   Check for open circuits, corrosion, or poor pin fitment.

3. 3

   Test the motor and motor driver

   Test for proper operation and current draw.

4. 4

   Repair or replace defective components

   Repair or replace any defective wiring, the backup pump motor, or the ABS module as indicated by the circuit test.

5. 5

   Clear the Diagnostic Trouble Codes (DTCs)

   Clear the DTCs from the system.

6. 6

   Cycle the system

   If the DTC returns, re-evaluate the ABS module and Hydraulic Control Unit.