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PRECAUTIONS ECM-9 < PRECAUTION > [MR20DD] C D E F G H I J K L M A ECM N P O On Board Diagnostic (OBD) System of Engine and CVT INFOID:0000000010702780 The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the CAUTION: • Be sure to turn the ignition switch OFF and disconnect the negative battery cable before any repair or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. will • Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will cause the MIL to light up due to the open circuit. (Be sure the connector is free from water, grease, • Certain systems and components, especially those related to OBD, may use a new style slide-lock- ing type harness connector. For description and how to disconnect, refer to . • Be sure to route and secure the harnesses properly after work. The interference of the harness with a bracket, etc. may cause the MIL to light up due to the short circuit. • Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube may cause the MIL to light up due to the malfunction of the EVAP system or fuel injection system, • Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM and TCM (Transmission control module) before returning the vehicle to the customer. General Precautions INFOID:0000000010702781 • Always use a 12 volt battery as power source. running. • Before connecting or disconnecting the ECM harness con- nector, turn ignition switch OFF and disconnect negative bat- • Before removing parts, turn ignition switch OFF and then dis- connect battery ground cable. • Do not disassemble ECM. the ECM value. • If the battery is disconnected, the following emission-related diagnostic information will be lost within 24 hours. - Diagnostic trouble codes SEF289H JPBIA4618ZZ |