Case IH 17910 (F-3512-06) - ECU – Engine Control Module (ECM): ECM 5 volt sensor supply 4 high side output driver over temperature failure

The Engine Control Module (ECM) provides a 5-volt reference signal to various engine and cab sensors. This code indicates that the internal driver inside the ECM responsible for Sensor Supply 4 has overheated, almost always caused by excessive current draw on the circuit due to a short to ground in the wiring harness or an internally shorted sensor.

• VESTRUM CVX
• Case IH Farmall series (115U Efficient Power)
• Case IH Magnum series (250-380)
• Case IH Optum series (270 CVT)
• Case IH Steiger series
• Case IH Axial-Flow Combines (5088, 6088, 7088)

1. 1

   Identify the sensors on Supply 4 (often the Accelerator Pedal Position Sensor) using the machine's wiring schematic

2. 2

   Inspect the wiring harness connecting the ECM to the sensors on Supply 4 for chafing, rubbing, or pinched wires causing a short to ground

3. 3

   Disconnect the sensors on the circuit, turn the key ON, and check if the 5V reference returns to isolate an internally shorted sensor

4. 4

   Check the ECM harness connectors for moisture, corrosion, or bent pins bridging the 5V supply to ground

5. 5

   Verify the machine's battery voltage and ECM power/ground supplies are within specification

1. 1

   Disconnect Power

   Turn off the machine and disconnect the battery negative terminal before repairing wiring or replacing modules.

2. 2

   Repair Wiring

   If a short to ground was found in the harness during diagnostics, repair the damaged wire using OEM-approved splicing techniques and heat-shrink tubing. Reroute the harness away from sharp edges or heat sources.

3. 3

   Replace Sensor

   If disconnecting a sensor cleared the short, replace the faulty sensor (e.g., Accelerator Pedal Position Sensor). Reconnect the harness and verify the 5V supply remains stable.

4. 4

   Replace the ECM

   If the wiring harness is completely isolated and tests good, but the ECM still fails to output 5V on circuit 4 or the driver remains in an over-temperature state, the ECM's internal driver is permanently damaged and the ECM must be replaced and flashed/programmed by an authorized Case IH dealer.

5. 5

   Clear Codes

   Reconnect the battery, turn the key ON, and use a diagnostic tool (like CNH EST) to clear the inactive fault codes and verify the repair.