Case IH 15520 – Steering: Auxiliary Steering Pump Pressure Error

This fault code indicates an error during the pressure check of the auxiliary steering system's pump. It is logged when the system detects a malfunction in the pressure regulation or monitoring of this specific hydraulic circuit, which typically serves as a secondary or backup steering system on larger tractors.

1. 1

   Visually inspect the auxiliary steering pump, associated hydraulic lines, and electrical connectors for any signs of damage, leaks, or loose connections

2. 2

   Check the hydraulic fluid level to ensure it is within the recommended operating range, and inspect the fluid for contamination

3. 3

   Check for other active fault codes related to pressure sensors, bypass valve solenoids, or the auxiliary steering pump relay to help pinpoint the root cause

4. 4

   Test the voltage and resistance of the auxiliary steering pressure sensor using a digital multimeter

5. 5

   Check the sensor wiring harness for continuity, short circuits to power, or short circuits to ground

1. 1

   Address preliminary findings

   If diagnostic checks reveal low hydraulic fluid, contamination, or visible damage to components or wiring, rectify these issues first before replacing major components.

2. 2

   Test and replace pressure sensor

   If initial checks do not resolve the issue, test the auxiliary steering system pressure sensor's output. If the readings are outside of the manufacturer's specifications, replace the sensor.

3. 3

   Inspect auxiliary pump and valves

   If the pressure sensor and wiring are functioning correctly, check the auxiliary pump for mechanical failure. Inspect the bypass valve solenoid for proper electrical function (checking for open circuits or shorts) and ensure the valve is not mechanically stuck.

4. 4

   Clear codes and verify repair

   After replacing any components, clear the fault codes from the system. Operate the machine to verify that the fault code does not reappear.