A resolver is one way an electric drive measures rotor position. It uses an excitation signal and related sine and cosine signals whose relationship allows electronics to calculate angle. The resolver-to-digital circuitry can also provide information used to determine speed.
Position sensing is a complete signal path
A resolver-related fault can concern the excitation, return signals, wiring or the electronics interpreting them. It should not automatically be described as a failed motor. The exact signal requirements and test method depend on the fitted drive system.
Tell the workshop whether the fault followed motor, inverter or harness work. Include the complete code and any subcode rather than only a shortened scan-tool description. If the car behaves differently hot and cold, record that too.
Mechanical identity and electrical setup both matter
A replacement assembly may need a supported setup or learning procedure. That possibility must be checked against the manufacturer’s instructions, not assumed from another model. Programming cannot compensate for an unresolved signal or wiring fault.
Send AXION the motor and inverter identities with the diagnostic report. We can establish the next stage of assessment and whether installation support is available. Do not substitute generic signal voltages or pinouts from a different resolver design when testing a vehicle system.
Arrange an assessment
For EV and hybrid diagnostics, send the vehicle details and fault report to AXION. We support enquiries from drivers and garages. Workshop, postal and remote options depend on the job and are confirmed before booking.
Technical reference
Read the supporting technical documentation. The referenced design or vehicle application defines its scope; it is not a universal repair procedure.
Related reading
Inverter temperature protection and reduced EV drive power. Browse the automotive electronics repair library for other systems and symptoms.