Code 2-4-1 (EGR System)

Turn ignition on. Press button on diagnostic unit 3 times. Each time hold for one second. The LED should begin to flash at the 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 Series; Red/Green wire on all others). Resistance should be 85 ohms.