Description:

ECU 000640.31 is activated when an external derate command is issued, often due to a steering health signal reporting a problem. This derate command reduces engine power to ensure safe operation under the detected fault condition.

Reaction:

The ECU disables certain functions or reduces engine power to prevent potential safety issues or damage.

Recommendations:

• Diagnose Steering System: Inspect the steering system to identify and address any reported health issues.
• Check Steering Sensors and Signals: Ensure that all steering-related sensors are functioning correctly and providing accurate data.
• Repair or Replace Faulty Components: Fix any detected problems within the steering system that could be causing the derate command.
• Reset ECU and Test System: After addressing the steering issues, reset the ECU and perform a system test to confirm that the derate command is no longer active.

Note:

Ensuring the proper function of the steering system is critical for vehicle safety and preventing unnecessary derate commands.