Common motor faults and diagnosis
Working through realistic fault scenarios a technician might encounter.
You'll learn
- Explain common motor faults and diagnosis at engineering level
- Read the numbers that define the behaviour
- Apply the idea to a real drive unit
Overview
Most real motor faults present as a handful of recognisable symptom patterns — recognising them quickly separates an experienced technician from a guessing one.
In depth
Fault diagnosis
Drive unit fault clinic
Work through two realistic fault scenarios.
Reduced power warning after fast driving
A driver reports a 'reduced power' warning appearing only after 15-20 minutes of hard motorway driving, clearing itself once the car has been parked for a while.
Diagnostic checks
Your diagnosis
Key takeaways
Remember this
- Thermal derating is a normal protective response, not always an underlying fault.
- Position sensor connection issues can cause jerks correlated with logged fault codes.
- Correlating symptom timing, logged codes and physical inspection quickly narrows root cause.
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