Case IH 19081 (DTC 717A) - ECU – Engine ECU: DEF/AdBlue dosing valve actuator short circuit to ground in high side failure

The system has detected a short to ground at the energy stage on the high side of the DEF (Diesel Exhaust Fluid) dosing valve actuator circuit. This can occur during dosing and may be associated with excessive effort for dosing.

• MAXXUM T4E
• 240 Series Axial-Flow Combines (7240, 8240, 9240)
• Magnum (180 through 380)
• Maxxum (115 through 150)
• Optum (270, 300)
• Puma (140 through 240)

1. 1

   Inspect the wiring harness running from the Engine ECU to the DEF dosing valve for chafed wires, cuts, or areas where the high-side power wire might be rubbing against the chassis, causing a short to ground.

2. 2

   Disconnect the DEF dosing valve and check the connector for moisture, corrosion, or bent pins, which can bridge circuits and cause a short.

3. 3

   Test the DEF dosing valve actuator itself with a multimeter to see if the internal solenoid/actuator is shorted to its own casing (ground).

4. 4

   Check the DEF dosing lines for crystallized DEF fluid and verify that the DEF filter is not severely blocked.

1. 1

   Power Down

   Turn off the machine and disconnect the battery to prevent electrical spikes during repair.

2. 2

   Repair Wiring

   If the diagnostic checks revealed a chafed wire shorting to the frame, repair the damaged section of the harness and secure it away from vibration points.

3. 3

   Replace the Dosing Valve

   If the wiring is intact but the valve is internally shorted, remove the DEF dosing valve (injector) from the exhaust stream and install a new unit.

4. 4

   Replace the DEF Filter

   It is highly recommended to replace the DEF filter during this service to ensure no blockages are causing excessive pump/dosing effort.

5. 5

   Clear Codes and Test

   Reconnect the battery. Use a dealer-level diagnostic tool (or equivalent) to clear the 19081 / 717A fault code.

6. 6

   Run a Self-Test

   Initiate a DEF/DPF self-test or dosing test via the diagnostic tool to verify the system builds pressure and doses correctly without logging the code again.