Case IH 702-04 - UCM – UCM: Scraper (auto aux) input 2 voltage high

The control module is seeing a voltage signal from the scraper's auxiliary input 2 circuit that exceeds the normal operating range (typically indicating a short to power or an open circuit).

• MAGNUM AFS Connect
• Steiger
• Puma

1. 1

   Inspect the wiring harness between the UCM and the scraper auxiliary input 2 sensor/switch for any visible damage, rubbing, or pinched wires.

2. 2

   Check the connector pins at both the UCM and the scraper input sensor for corrosion, moisture, or bent pins.

3. 3

   Test the circuit with a multimeter to verify if there is a short to a high-voltage source or an open ground on the sensor circuit.

1. 1

   Disconnect battery

   Disconnect battery power before servicing the UCM or harness.

2. 2

   Repair or replace wiring harness

   Repair or replace the damaged section of the wiring harness if a short to power or open circuit is found.

3. 3

   Clean and re-seat connectors

   Clean and re-seat the connectors at the UCM and the scraper auxiliary input.

4. 4

   Replace sensor/switch

   If the wiring is intact and the voltage reading at the sensor is out of specification, replace the scraper auxiliary input sensor/switch.

5. 5

   Clear fault codes

   Clear the fault codes via the Pro 700 / AFS Connect monitor and cycle the key to verify the repair.