OBD Diagnostics for Fuel Cut-Off During Deceleration

During deceleration, modern engines often stop fuel injection entirely. OBD fuel cut-off diagnostics ensure this system activates correctly to save fuel.

How Fuel Cut-Off Works

Deceleration Conditions

Occurs when throttle is closed and RPM is above idle.

Fuel Injection Suspension

Injectors are temporarily disabled.

OBD Parameters Used

Key Indicators

• Throttle position

• Engine RPM

• Vehicle speed

Issues Detected

Delayed Fuel Cut-Off

Causes unnecessary fuel consumption.

Harsh Re-Engagement

Poor calibration can cause jerky transitions.

Benefits of Fuel Cut-Off Diagnostics

• Improved fuel efficiency

• Reduced emissions

• Smoother deceleration

Conclusion

OBD diagnostics ensure deceleration fuel cut-off systems function efficiently and smoothly.