Once the ECU has been programmed, the ECU remains in reprogramming mode until the ECU is restarted by power cycling the ECU. Without FEPS applied, the ECU will enter application mode and run the model.

The testing phase seeks to ensure that the built Simulink model acts as expected under all circumstances. OpenECU provides a CCP interface to allow calibration tools to access model information. See Appendix 2, Supporting tools for an introduction to how to use one of the supported calibration tools to monitor the model while it runs on the ECU.