A module output that disappears under load may be reacting to a fault rather than suffering a simple broken connection. Some output devices monitor current and temperature as part of their protection.

What to check next

Compare the requested output, the actual load current and the supply during the event. Check the connected component and harness before assessing the driver on the circuit board. Replacing an output stage without resolving an external overload can bring the same problem back.

Useful information for an enquiry

Send the exact output affected, fault code and results of the external circuit checks.

Protection behaviour varies by device and software. Do not bypass the output protection to make the load operate.

Speak to AXION

For ECU testing and component-level repair, send your vehicle details and fault report. Workshop assessment is in Didcot, Oxfordshire. Suitable postal or remote work is confirmed before booking.

Technical background from Texas Instruments. The referenced design explains the principle; the vehicle-specific procedure determines the repair.

Related reading — Repeated output pulses can be a protection retry sequence. Browse all vehicle-electronics diagnostic notes or return to the repair library.