Case IH t20 – Engine Control Unit (ECU): After-Run Not Completed, Data Valid But Below Normal Range

This typically indicates an issue during the engine or module's power-down sequence (the "after-run" phase), where the system fails to complete its shutdown cycle properly and the recorded data falls below the expected normal parameters.

• MXM
• Case IH MXM Series (MXM 120, 130, 140, 155, 175, 190)
• Case IH Steiger Series
• Case IH MX / TG Series

1. 1

   Test battery voltage to ensure power isn't dropping out prematurely

2. 2

   Check main power relays for proper operation

3. 3

   Inspect ECU ground connections

4. 4

   Consult the specific tractor's service manual for unique diagnostic features

1. 1

   Verify fault code

   Connect the official CNH diagnostic tool (EST) to the tractor's diagnostic port to verify if t20 is an active or stored code.

2. 2

   Inspect wiring and relays

   Inspect the main engine wiring harness and the ECU power relays for corrosion or loose connections that could interrupt the after-run cycle.

3. 3

   Consult service manual

   Refer to the specific Case IH service manual for your model year to follow the exact troubleshooting tree for "After-Run Not Completed".

4. 4

   Clear codes and test

   Clear the fault codes and perform a key cycle (turning the tractor on, running it briefly, and turning it off) to see if the after-run sequence completes successfully and the code clears.