Coolant Temperature Sensor (ECT) — Maruti Suzuki Swift
Category: Cooling | Severity: high | Cost: ₹1,200–₹5,000
What is Coolant Temperature Sensor (ECT)?
Measures engine coolant temperature and sends data to ECU for engine management.
How Coolant Temperature Sensor (ECT) Works
Uses a thermistor whose resistance changes with temperature and communicates data to ECU.
Why is Coolant Temperature Sensor (ECT) Important?
Critical for fuel injection, ignition timing, and cooling fan operation.
Common Problems
- Incorrect temperature readings
- Sensor failure
Symptoms
- Engine overheating
- Poor mileage
- Hard starting
- Cooling fan not working
Causes of Failure
- Wear and tear
- Electrical faults
- Coolant contamination
Impact on Car Performance
Reduced efficiency, increased fuel consumption, and overheating risk.
DIY Fix Guide — Step by Step
- Check wiring
- Scan ECU for error codes
- Replace faulty sensor
Maintenance Tips
- Use proper coolant
- Avoid overheating cycles
Replacement Cost in India
Estimated range: ₹1,200 – ₹5,000
Where to Buy Online
When to Replace Coolant Temperature Sensor (ECT)
When ECU shows faulty readings or overheating issues persist.