Abstract: This paper is based on Electronic Control Unit (ECU) validation process for Input (crank signal) and Output Drivers (injector and ignition coil signals) characteristics. Because of the code flashed on ECU using IDE for particular microcontroller that controls the injector driver and ignition driver pulses respectively. Based on the given PWM Input signal(crank signal) it will give injector and ignition pulses , which is used to obtain ECUs best result using generated and flashed code on microcontroller on virtual environment setup. Hardware-in-loop setup is act as a virtual engine setup, which gives the input sensor signals to ECU for their best performance under test on bench or in lab testing.