Engine Control Unit (ECU) — MG Motor Majestor
Category: Electrical | Severity: high | Cost: ₹20,000–₹1,20,000
What is Engine Control Unit (ECU)?
Central computer that manages engine performance, fuel injection, ignition timing, and emissions.
How Engine Control Unit (ECU) Works
Processes data from sensors and controls actuators to optimize engine performance.
Why is Engine Control Unit (ECU) Important?
Critical for engine efficiency, power delivery, and emissions compliance.
Common Problems
- Software glitch
- Sensor communication failure
- ECU burnout
Symptoms
- Check engine light
- Poor performance
- Starting issues
Causes of Failure
- Voltage spikes
- Water damage
- Faulty wiring
Impact on Car Performance
Faulty ECU can reduce engine efficiency by 30–50%.
DIY Fix Guide — Step by Step
- Scan ECU using OBD tool
- Reset ECU
- Check wiring connections
- Update firmware
Maintenance Tips
- Avoid jump-start voltage spikes
- Keep ECU dry
Replacement Cost in India
Estimated range: ₹20,000 – ₹1,20,000
Where to Buy Online
When to Replace Engine Control Unit (ECU)
When ECU fails diagnostics or cannot be reprogrammed.