4-18 FI SYSTEM DIAGNOSIS DEALER MODE The defective function is memorized in the computer. Use the special tool’s coupler to connect to the dealer mode coupler. The memorized malfunction code is displayed on LCD (DISPLAY) panel. Malfunction means that the ECM does not receive signal from the devices. These affected devices are indicated in the code form. 09930-82720: Mode select switch E L P  M A Before checking the malfunction code, do not disconnect the ECM lead wire couplers. S If the couplers from the ECM are disconnected, the malfunction code memory is erased and the malfunction code can not be checked. MALFUNCTION LCD (DISPLAY) FI LIGHT INDICATION INDICATION MODE INDICATION “NO” C00 ---- C**code is indicated from FI light turns OFF. For each 2 sec., code is “YES” small numeral to large indicated. one.