After replacement of injectors or engine control unit, the injectors' injection time needs to be calibrated. The engine control unit indicates that calibration is needed with a flashing engine warning light. After a successful calibration, the engine warning light stops flashing.
If test conditions are outside the vehicle's calibration conditions when idling, the function may be difficult to run or cancel. In case of incorrect test conditions, the text "Unable to execute command" is shown. To initiate calibration again, the ignition key must be turned on/off.