Case IH 17763 (F-518146-02) - ECU – Engine Control Unit (ECU): ECU internal failure - ECU Temperature Sensor: Implausible sensor measuring

The control module has detected an internal hardware or software anomaly where the temperature reading from its own internal circuit board sensor is out of a plausible or expected range.

• VESTRUM CVX
• Austoft 9900 series
• Austoft 9000 series
• Farmall 40
• Farmall 45
• Farmall 50
• Farmall 115U
• Steiger
• Puma
• Maxxum
• wheel loaders
• dozers

1. 1

   Inspect the main wiring harnesses connected to the ECU for a short circuit to an external power source or ground, which can backfeed and trigger internal plausibility faults.

2. 2

   Verify that the ECU is receiving the correct operating voltage to rule out voltage spikes or severe undervoltage causing erratic internal sensor behavior.

3. 3

   Connect the Case IH Electronic Service Tool (EST) to check if the ECU dataset is corrupted. Attempt to re-flash or reprogram the ECM with a proper dataset to see if the internal error clears.

1. 1

   Turn off machine

   Turn off the machine, remove the key, and disconnect the battery to prevent electrical arcing.

2. 2

   Locate ECU

   Locate the Engine ECU (typically mounted on the side of the engine block or in a dedicated electronics bay, depending on the machine).

3. 3

   Disconnect wiring

   Carefully release the locking levers on the main wiring harness connectors and unplug them from the ECU.

4. 4

   Remove ECU

   Unbolt the defective ECU from its mounting bracket and remove it from the machine.

5. 5

   Install ECU

   Install the replacement ECU and secure the mounting bolts.

6. 6

   Reconnect wiring

   Reconnect the wiring harnesses, ensuring the locking levers are fully seated and secure.

7. 7

   Reconnect battery

   Reconnect the battery.

8. 8

   Program ECU

   Connect the Case IH Electronic Service Tool (EST). Flash the ECU with the specific dataset for your machine's PIN/serial number, perform injector coding, and run any necessary calibration routines (such as the Engine Restart Counter Reset).