An intermittent feedback problem may appear only in part of the operating range. A normal reading at one position does not test the complete signal path.

What to check next

A technician should compare the specified feedback relationship through an approved controlled test and preserve the point at which it becomes irregular. Supply, reference and connector condition should be checked alongside the signal. Recent cleaning or replacement is useful history.

Useful information for an enquiry

Send the exact symptom, any position dependence and the relevant trace or live-data recording.

Do not force an electronic throttle against its mechanism or carry out movement tests without the required precautions.

Speak to AXION

For complex vehicle-electronics diagnostics, 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 HELLA. The referenced design explains the principle; the vehicle-specific procedure determines the repair.

Related reading — AC coupling can hide the DC level of a module supply. Browse all vehicle-electronics diagnostic notes or return to the repair library.