An inductive load does not make its current follow every voltage transition instantly. A PWM voltage trace and the corresponding current trace therefore describe different aspects of operation.

What to check next

Review both measurements together using the correct reference and scale. Identify the commanded current behaviour and the circuit’s current-decay path. A technician should avoid treating every off portion of the voltage waveform as an instant loss of solenoid force.

Useful information for an enquiry

Include synchronised voltage and current recordings where available.

The exact behaviour depends on the driver and load. A generic PWM percentage cannot establish the resulting mechanical action.

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

Related reading — Current-sense bandwidth can affect a solenoid test result. Browse all vehicle-electronics diagnostic notes or return to the repair library.