NANO

252 ENGINE 273 MPFI CABLE COLOR CODES WIRE CODE WIRE COLOUR B BLACK BR BROWN G GREEN GY GREY L BLUE O RANGE P PINK R RED W WHITE Y YELLOW V VIOLET LG LIGHTGREEN SB SKY BLUE ECUHANDLING ANDCARE Earth (Ground) Connection : • Ensure all the ground connections are fixed correctly. • DO NOT leave any grounded wire loose or open. • ECUground pins should be groundedwithin 300mm from the ECU. Power Supply : • At IGNITION ON, ECU starts functioning and initializes, the power for the main drivers for the ECUare taken from theMAINRELAYpower supply. TheMAINRELAYoutput stage gives 12 volts when ECU grounds the MAIN RELAY at IGNITION ON. After IGNITION OFF the ECU holds the MAIN RELAYGROUND for some duration known as the POWER LATCH per iod so that the vi tal functionalities are powered ON for that duration. Precaution : Do not disconnect the connector of the ECU for at least 1 minute after IGNITION OFF. Never disconnect the connector of the ECU during IGNITIONON. • Ensure that ignition switch is in OFF position while plugging - in the connector to the ECU. Input • Ensure that the Input signal line is as far as possible away from noise sources such as High Tension Cable, Horn relay, Motor etc. • Ensure that sealed wire are used for input line of lambada oxygen Sensor, CrankAngle Sensor and the wiring is as far as possible from the noise sources similar to the ones above. Sensor ground connections should not be shorted to 12 volts supply. Output • Take care to avoid dead - short (solenoid short - circuit etc.) and similar circuit misconnection while checking (to avoid any damage). Use a solenoid which does not use a fly - back diode (reverse polaritymay damage theOutput Power Transistor). Installation • Ensure that the ECU is secured firmly to the body using screws. • Ensure that there is no water seepage into the ECU. • Do not use an ECU which has been dropped once. • Do not try to repair the ECU. • Use standard harness for circuit connections. • Do not try to insert any thing into the ECU case. • Take care to avoid any bending of the connector pins while inserting the connector. • Ensure that the connector is inserted in the end after all the installation is complete. • To carry out welding job on the car the ECU should be disconnected.