Case IH 1056-18 - ITBV – ITBV: Trailer Brake Control Line Pressure Disagreement

The fault indicates a plausibility error within the Intelligent Trailer Brake Valve (ITBV) system. The system detects a mismatch between the expected (commanded) pressure and the actual pressure measured on the trailer brake control line.

• MAGNUM AFS Connect
• Magnum 180
• Magnum 200
• Magnum 220
• Magnum 240
• Magnum 250
• Magnum 280
• Magnum 310
• Magnum 340
• Magnum 380

1. 1

   Perform a pressure plausibility check by verifying the actual pressure on the control line versus the supply pressure to confirm if it is genuinely low or if a sensor is failing.

2. 2

   Check the Inlet Valve (IV) and Outlet Valve (OV) on the ITBV for electrical faults, including short to power, short to ground, low current, or high current.

3. 3

   Check the TCV pressure sensor supply voltage for a short to power or short to ground.

4. 4

   Verify the service brake pedal switch circuit and sensor voltage, as an invalid output can trigger pressure controller plausibility faults.

1. 1

   Inspect hydraulic hoses and tubes

   Inspect the physical hydraulic hoses and tubes running from the ITBV to the brake valves for leaks or blockages that would cause a low-pressure condition.

2. 2

   Test ITBV solenoid valves

   Test the ITBV solenoid valves (Inlet and Outlet). If an internal short or open circuit is found, the valve or solenoid must be replaced.

3. 3

   Verify tractor software

   Verify the tractor's software. Ensure the module is flashed to at least software version 1.3.0.0.