Code 2-4-1 (EGR System)

Turn ignition on. Press button on diagnostic unit 3 times. Each time hold for one second. LED should begin to flash at same rate as EGR converter is energized. Connect ohmmeter between terminals No. 6 (Blue wire on all models) and 15 (White/Black wire on 240; Red/Green wire on 740/940). Resistance should be 85 ohms.