correction is made with the lambda correction, this results in a stoichiometric combustion (Lambda=1). The lambda correction is allowed to adjust the calculated injection duration by ±25%. The ECU can change the correction factors in the main fuel matrix on basis of the lambda correction, this ensures good driveability, fuel consumption and emissions when lambda correction isn’t activated. This is called Adaptation. Pointed adaptation If the ECU calculates the injection duration to 8 ms but the lambda correction adjusts it to 9 ms due low fuel pressure the ECU will "learn" the new injection duration. This is done by changing the correction factor for that particular RPM and load point in the main fuel matrix to a new correction factor resulting in 9 ms injection duration. The correction factor in this example will be raised by 9/8 (+12%). The pointed adaptation can change the points in the main fuel matrix by ±25%. Adaptation occurs every fifth minute and takes 30 seconds to finish, the criteria for the adaptation are: Lambda correction is activated and the coolant temperature is above 64℃ (147F). During the adaptation the ventilation valve on the carbon canister is held close. Global adaptation The global adaptation on OBDII variants occurs during driving; on non OBDII variants the global adaptation occurs 15 minutes after engine shut down. When the engine is inside a defined load and RPM range (60 – 120 kPa and 2000 – 3000 RPM) no pointed adaptation will occur all points in the fuel matrix will be changed instead by a multiplication factor. Global adaptation can change the points in the main fuel matrix by ±25% (Tech2 shows ±100%). Adaptation occurs every fifth minute and takes 30 seconds to finish, the criteria for the adaptation are: Lambda correction is activated and the coolant temperature is above 64℃ (147F). During the adaptation the ventilation valve on the carbon canister is held close. Fuel cut With fully closed throttle and engine RPM over 1900 RPM and with third, fourth and fifth gear a fuel cut will occur after a small delay (some second). On automobiles with automatic transmission fuel cut is active in all stages. The injectors are reactivated when the RPM hits 1400 RPM. Fuel consumption measurement The wire from the ECU to the third injector is also connected to the main instrument. The main instrument calculates the fuel consumption based on the injection pulses duration.