1.2L REVOTRON ENGINE 150 ECU Block Diagram : ECU Handling and Care : Earth (Ground) Connection: 1. Ensure all the ground connections are fixed correctly. 2. DO NOT leave any grounded wire loose or open. 3. ECU ground pins should be grounded within 300mm from the ECU. Power Supply: At IGNITION ON, ECU starts functioning and initializes, the power for the main drivers for the ECU are taken from the MAIN RELAY power supply. The MAIN RELAY output stage gives 12 volts when ECU grounds the MAIN RELAY at IGNITION ON. After IGNITION OFF the ECU holds the MAIN RELAY GROUND for some duration known as the POWER LATCH period so that the vital 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 IGNITION ON. 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 lambda oxygen Sensor, Crank Angle 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 polarity may damage the Output Power Transistor). Mounting / Installation Guidelines : While mounting to the fixation the ECU must be fixed without deformations. As an ideal solution, a connection with minimum 3 screws, screwed on a plan surface, is to be considered. Bouncing of the fixed ECU between ECU and fixation underground is not permissible.
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