ALTROZ SERVICE MANUAL

1.2L REVOTRON ENGINE 173 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.  Stagnant humidity and water standing directly on the sealing area (“bath tub”) between cover and bottom part or respectively the connector is not permissible. That means the defined mounting angles of the offer drawing must be considered.  Formation of electro-chemical corrosion created by the use and connection of different metals within the installation of the control device is to be avoided.  Following combination of materials are not acceptable: Steel – Brass - PBT = stress corrosion cracking (appearance of base at NaCl load).  The first fixation point of the wiring harness must be in a distance - 150 mm from the cable outlet and on the same vibration level as the ECU.  Relative motion between the wiring harness and the ECU has to be minimized.  It has to be assured that no water can infiltrate through the wiring harness into the connector or the ECU respectively. This can be achieved by using a Siphon or a breathing hole.  If the Electronic Control Module is coated, it must be ensured, that the Pressure Compensation Element (PCE), the connector and the label are free of coating.  The mounting position of the ECU has to be in a distance which is large enough from a heat source to avoid any influence of heat transfer to the ECU.  The mounting place of the ECU should be chosen to gain low humidity and corrosion loads. Permanent water spraying based on splash water must be avoided by appropriate protections.  The impact of chemicals (e.g. oils, diesel, and gasoline, detergents for cleaning, brake fluid, battery acid, and so on) should be low.