Viewing Diagnostic Codes 2 From the Diagnostic Codes menu, select Inactive Codes . DIAGNOSTIC CODES ----Selections---- INACTIVE CODES The screen indicates that the codes are being retrieved, then displays the data screen. For example: 33 MID:128 ENGINE TURBO BOOST SENSOR INPUT VOLTAGE HIGH I 1 PID:102 FMI: 3 —If no codes are detected, the screen indicates, “ No Inactive Codes ”. In this instance, press to exit the screen. 3 Press the or key to scroll through the data, as needed. Detroit Diesel Application User’s Manual 19