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PRECAUTIONS EC-9 < PRECAUTION > [VK56DE] C D E F G H I J K L M A EC N P O Precaution INFOID:0000000009886486 • Always use a 12 volt battery as power source. • Do not 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. • Do not 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 dis- connected. However, this is not an indication of a malfunc- tion. Do not 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 - <Flexible Fuel Vehicle> Presumed ethanol mixture ratio • When connecting ECM harness connector, fasten it securely with a lever as far as it will go as shown in the figure. • When connecting or disconnecting pin connectors into or from ECM, take care not to damage pin terminals (bend or break). Make sure that there are not any bends or breaks on ECM pin terminal, when connecting pin connectors. • Securely connect ECM harness connectors. A poor connection can cause an extremely high (surge) volt- age to develop in coil and condenser, thus resulting in dam- age to ICs. • Keep engine control system harness at least 10 cm (4 in) away from adjacent harness, to prevent engine control system mal- functions due to receiving external noise, degraded operation of ICs, etc. • Keep engine control system parts and harness dry. SEF289H PBIB1164E BBIA0387E PBIB0090E |