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EC-478 < PRECAUTION > [VQ40DE] PRECAUTIONS • 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 . • Always route and secure the harnesses properly after work. The interference of the harness with a bracket, etc. may cause the MIL to illuminate due to the short circuit. • Always connect rubber tubes properly after work. A misconnected or disconnected rubber tube may cause the MIL to illuminate due to the malfunction of the EVAP system or fuel injection system, etc. • Always erase the unnecessary malfunction information (repairs completed) from the ECM and TCM (Transmission control module) before returning the vehicle to the customer. Precaution INFOID:0000000006244185 • Always use a 12 volt battery as power source. • Never attempt to disconnect battery cables while engine is running. • Before connecting or disconnecting the ECM harness con- nector, turn ignition switch OFF and disconnect negative bat- tery cable. Failure to do so may damage the ECM because battery voltage is applied to ECM even if ignition switch is turned OFF. • Before removing parts, turn ignition switch OFF and then dis- connect negative battery cable. • Never disassemble ECM. • If a battery cable is disconnected, the memory will return to the ECM value. The ECM will now start to self-control at its initial value. Engine operation can vary slightly when the terminal is disconnected. However, this is not an indication of a malfunction. Never replace parts because of a slight variation. • If the battery is disconnected, the following emission-related diagnostic information will be lost within 24 hours. - Diagnostic trouble codes - 1st trip diagnostic trouble codes - Freeze frame data - 1st trip freeze frame data - System readiness test (SRT) codes - Test values - <Frexible Fuel Vehicle> Presumed ethanol mixture ratio • When connecting ECM harness connector, fasten it securely with levers as far as they will go as shown in the figure. SEF289H PBIB1512E 2011 Pathfinder |