Homologation Procedure

When carrying out a drive cycle C to determine a fault in any of the above areas, select the readiness test icon to verify that the test has been flagged as complete.

⇒ 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.

Driving cycles for other vehicles and engine management systems 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.

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).

System Monitoring

Within the framework of OBD, certain components/systems must be monitored once per driving cycle while other control systems (e.g. misfire detection) must be monitored continuously throughout the drive cycle.