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ON BOARD DIAGNOSTIC (OBD) SYSTEM EC-65 C D E F G H I J K L M A EC ON BOARD DIAGNOSTIC SYSTEM FUNCTION The on board diagnostic system has the following four functions. MIL Flashing Without DTC If the ECM is in Diagnostic Test Mode II, MIL may flash when engine is running. In this case, check ECM diag- EC-65, "HOW TO SWITCH DIAGNOSTIC TEST MODE" How to switch the diagnostic test (function) modes, and details of the above functions are described later. 65, "HOW TO SWITCH DIAGNOSTIC TEST MODE" The following emission-related diagnostic information is cleared when the ECM memory is erased. ● Diagnostic trouble codes ● 1st trip diagnostic trouble codes ● Freeze frame data ● 1st trip freeze frame data ● System readiness test (SRT) codes ● Test values ● Others HOW TO SWITCH DIAGNOSTIC TEST MODE NOTE: ● It is better to count the time accurately with a clock. ● It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit ● Always ECM returns to Diagnostic Test Mode I after ignition switch is turned OFF. Diagnostic Test KEY and ENG. Function Explanation of Function Mode I Ignition switch in Engine stopped BULB CHECK This function checks the MIL bulb for damage (blown, Engine running MALFUNCTION This is a usual driving condition. When a malfunction is ● Misfire (Possible three way catalyst damage) ● One trip detection diagnoses Mode II Ignition switch in Engine stopped SELF-DIAGNOSTIC This function allows DTCs and 1st trip DTCs to be read. Engine running HEATED OXYGEN SENSOR 1 This function allows the fuel mixture condition (lean or |