Case IH 15228 – Steering Valve Controller: Cut-off solenoid supply voltage too high

The supply voltage to the cut-off solenoid is too high. This typically means the circuit is experiencing a short to a higher voltage source (such as battery voltage) or the controller is outputting a voltage higher than the expected operating range for the solenoid.

• Steiger T4B
• Farmall 40-45-50 with CVT
• Farmall 115U
• Maxxum
• Puma
• Magnum

1. 1

   Verify the steering valve controller's 5-volt supply to ensure the module itself is not experiencing a general overvoltage condition.

2. 2

   Visually inspect the wiring harness running from the steering valve controller to the cut-off solenoid for chafing, melted insulation, or pinched wires that could cause a short to battery voltage.

3. 3

   Disconnect the cut-off solenoid and use a multimeter to measure the voltage at the supply pin on the harness side while the key is ON. A reading of battery voltage (12V/24V) indicates a short to power in the harness.

4. 4

   Test the resistance of the cut-off solenoid to ensure it is not internally shorted.

1. 1

   Disconnect Power

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

2. 2

   Isolate the Circuit

   Disconnect the electrical connector at the steering valve cut-off solenoid and the corresponding connector at the Steering Valve Controller.

3. 3

   Repair Wiring

   If the diagnostic checks revealed a short to power in the harness, trace the wire from the controller to the solenoid. Locate the damaged section of the wire where it is contacting a 12V/24V source. Splice and solder the wire, then seal it with heat-shrink tubing, or replace the affected harness section.

4. 4

   Replace Solenoid

   If the overvoltage condition damaged the cut-off solenoid (e.g., it fails a resistance test or is stuck open/closed), unbolt the faulty solenoid from the steering valve block and install a new one.

5. 5

   Reassemble and Clear Codes

   Reconnect all electrical connectors and the battery. Turn the key ON, clear the fault codes using a diagnostic tool, and perform a transition test from on-road to off-road mode to ensure the cut-off solenoid spool moves correctly and the code does not return.