Component description Function check with diagnosis program Diagnostic button, test connection Diagnostic button An EDC panel, containing a diagnostic button (yellow), is provided to monitor the EDC system functions. This starts to flash if the EDC system receives abnormal signals or if any technical problem occurs with the sys- tem. The program can read fault codes which have been stored in the engine control unit, check input and out- put signals, read off current values from engine sen- sors, store and print out test results.
If the engine is to be installed in a vehicle, it is the re- sponsibility of the vehicle constructor to connect a diag- nostic button in a suitable location, such as the instru- ment panel. DIAGNOSTIC BUTTON The program allows service and workshop personnel to quickly localise and attend to faults in the EDC sys- tem. NOTE! If the button is depressed when the lamp flash- es, the lamp will flash out a two-digit fault code, please refer to the “Function check with diagnostic button“ chapter. It is connected to the engine control unit via a diagnos- tic connector. User information is included with the program. Please refer to “Special tools“ to order the software.
Test/diagnostic connector (15) A test/diagnostic connector is available in the junction box. If the engine is installed in a vehicle, a diagnostic button should be installed on the instrument panel etc. TWD740VE TWD1231VE Alternator (3) An alternator with built-in zener diodes must be used to protect the electronics. Please contact Volvo Penta when selecting the alternator. 22 31