Homologation Procedure

Note: The following driving cycles are specific to vehicles which utilise additional emission control equipment such as advanced evaporation systems and secondary air injection systems.

⇒ Drive cycle D: 1. Switch ignition on for 30 seconds. 2. Ensure engine coolant temperature is less than 35°C (95°F). 3. Start the engine and allow to idle for 2 minutes. 4. Perform 2 light accelerations (0 to 35 mph (0 to 60 km/h) with light pedal pressure). 5. Perform 2 medium accelerations (0 to 45 mph (0 to 70 km/h) with moderate pedal pressure). 6. Perform 2 hard accelerations (0 to 55 mph (0 to 90 km/h) with heavy pedal pressure). 7. Cruise at 60 mph (100 km/h) for 5 minutes. 8. Cruise at 50 mph (80 km/h) for 5 minutes. 9. Cruise at 35 mph (60 km/h) for 5 minutes. 10. Allow engine to idle for 2 minutes. 11. Connect TestBook and check for fault codes.

⇒ Drive cycle E: 1. Ensure fuel tank is at least a quarter full. 2. Carry out Drive Cycle A. 3. Switch off ignition. 4. Leave vehicle undisturbed for 20 minutes. 5. Switch on ignition. 6. Connect TestBook and check for fault codes.

The specific driving cycles to be used for a particular vehicle and engine management system may differ slightly depending on the type of emissions related equipment fitted to the vehicle (e.g. secondary air injection system). Refer to the engine management system for a particular engine in the relevant vehicle workshop manual or consult ’Testbook’.

Driving conditions can be performed on a roller dynamometer or test track.

Homologation Procedure

The emissions testing procedure for vehicles produced after the introduction of EURO-3 includes a modified driving cycle for measuring the pollutants in the emissions of passenger cars and lightduty trucks. As part of the homologation procedure, the manufacturer must provide proof that the vehicle successfully completes the driving cycle stipulated in accordance with this EU directive, twice in succession without any malfunctions.

The driving cycle consists of the previous EDC (urban) as Part 1 and the new Part 2 (out of town).