P0A49 Possible Causes
- Faulty inverter with converter assembly
- Faulty hybrid vehicle generator assembly
- Faulty hybrid vehicle motor assembly
- Wiring harness or connector
What Does It Mean?
How to Fix Code P0A49
Check the “possible causes” listed above. Visually inspect the wiring harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins. P0A49
Possible Symptoms
Check engine light illuminated (or service engine soon warning light)
P0A49 Meaning
A resolver is a sensor used to detect the position of the magnetic poles of a motor-generator rotor. Knowledge of the pole positions is essential to ensure precise control of MG2 and MG1.
Each resolver contains a stator with an excitation coil and 2 detection coils (S, C). The gap between the stator and rotor changes as the rotor rotates because the rotor is oval-shaped. An alternating current with a predetermined frequency flows through the excitation coil, and the S and C detection coils produce alternating currents according to the position of the sensor rotor.
The inverter with converter (MG ECU) detects the absolute position of the rotor based on the phases of the S and C detection coils and the heights of their waveforms. Additionally, the CPU calculates the amount of position change over a predetermined duration to use the resolver as a speed sensor.
The MG ECU monitors signals from the motor resolver and detects malfunctions.