User manual FERRARI 328 GTB WORKSHOP MANUAL

[. . . ] TECHNICAL SERVICE DEPARTMENT TECHNICAL INFORMATION Area 1 Model All 8 Cylinder models Bulletin n° 1215 Date May 2004 Pages 1 SUBJECT: Timing belt for 8-cylinder engines For your information, all 8-cylinder Ferrari models, independent of the Model Year, must have the timing belts replaced every 30, 000 miles or every 3 years, whichever comes first. For information on Timing Belts for 12-cylinder engines, refer to Technical Information Bulletin number 1003 dated October 2002. ______________________________ Ferrari North America, Inc. TECHNICAL SERVICE DEPARTMENT TECHNICAL INFORMATION BULLETIN Area 8 Model All 360 Versions/Models Bulletin n° 1218 Date July 2004 Pages 9 Subject: Bosch Motronic Electronic Control Unit (ECU) - Service Campaign 103 This technical information bulletin addresses erroneous Malfunction Indicator Light (MIL) "ON" cases in certain 360 U. S versions vehicles. The particular Bosch Motronic ECU was fitted in the 360 vehicle Model Year 2002 with the following part numbers: · Part No. 190768 - F1 gearbox Version A fix has been implemented by introducing of a new software package which monitors the Secondary air system efficiency starting with the Model Year 2003 version. [. . . ] As the battery voltage decreases, it is necessary to increase the opening time of the electro-injectors in order to deliver the correct quantity of fuel to the cylinders. t5 This factor is worth 1 when the system is functioning with an "open loop" while it can be worth from 0. 8 to 1. 2 when the system is functioning with a closed loop and corrects tj on the basis of the oxygen sensor, in order to bring the air/fuel mix ratio to the stoichiometric value. NOTES The Motronic system ECUs can work with battery voltages of up to 6V. Closed Loop Operation The closed loop control system guarantees the accuracy of the mixture composition which is essential to maximise the efficiency of the trivalent catalytic converter. During standard operation, the signal generated by the oxygen sensors is compared with a predetermined threshold, in order to establish how the ECU will work to bring the mixture to the stoichiometric value. NOTES The oxygen sensors are mounted in the exhaust while the air/fuel ratio correction takes place in the intake system: this means that there is a time delay in the system's checking logic. Open loop Operation The system is controlled by the ECU according to pre-set values, without any corrective action resulting from the oxygen sensor signals, therefore regardless of the oxygen content in the exhaust gases. In conditions of normal use, this mode functions when: 1 - The oxygen sensor is insufficiently hot (sensor temperature below approximately 300 °C). 2 - The engine coolant temperature is below 50 °C (but above ­7 °C). NOTES In analogous conditions (­10 °C < T° < 40 °C), the ECU for the US M. Y. 4 - Engine revolution speed > 4000 ± 200 rpm. Open loop Mode for Checks and Diagnosis The open loop mode can also be simulated to check the engine operation when the motor is warm, leaving the oxygen sensors disconnected. The ECU microprocessor calculates the spark advance needed according to the values assumed by these input figures. The advance curves are improved during the design and experimentation phase and once they have been entered in the memory they cannot be altered. The ECU also corrects the spark advance according to the engine conditions of use. Start-up Phase During the start-up phase, which is recognised, like the injection phase, on the basis of the number of engine revolutions, the spark advance is corrected according to a graph such as the one indicated in Fig. 6. °SA ­ Spark advance temperature in degrees On the other hand, the graph in Fig. 7 shows the trend of the spark advance according to the coolant temperature. °SA ­ Spark advance temperature in degrees As the temperature increases, the spark advance is gradually decreased. The ECU of the Motronic system is capable of controlling the coil charge time, generating a control signal for the power module. To optimise the coil functioning using the maximum current value, the ECU sets the charge time according to the engine revolution speed and the battery voltage. 8 shows the trend of the closing angle or the running time for the power module according to the number of revolutions and the battery voltage. Keys to Fig. 8 X - Battery voltage Y - Engine revolutions Z - Closing angle C2. 03 AIR FLOW METER The identification of the engine load, and so the air-intake volume (needed to distribute the correct quantity of fuel), is carried out by means of the signal generated by the air flow meter. The air taken in by the engine passes through the flow meter hitting the hot-film sensor located inside the air flow duct. [. . . ] 130383 130553 130664 130669 130678 130679 130684 130685 130717 130724 130746 130752 130753 130759 130760 130763 130764 130783 130785 130786 130793 130804 130811 130859 130860 130868 130869 130870 130879 130880 130895 130896 130897 130898 130904 130905 130906 130907 130980 130981 130985 Assembly No. 48057 47931 47848 47850 47916 47854 47884 47893 48150 47849 47887 47904 47952 47913 47925 47963 47944 47867 47872 47875 47903 48166 47930 47926 47932 47964 47955 47974 47983 47992 48007 48008 47973 48006 48010 48030 48012 47999 48029 48052 48075 FERRARI NORTH AMERICA, INC. 130991 130992 130998 130999 131029 131035 131036 131044 131045 131051 131052 131059 131067 131068 131106 131107 131114 131115 131122 131123 131124 131131 131132 131138 131139 131146 131147 131189 131195 131196 131197 131203 131204 131210 131211 131219 131220 131224 131225 131228 Assembly No. 48058 48098 48096 48100 48047 48050 48059 48078 48077 48103 48086 48109 48112 48147 48161 48118 48168 48177 48202 48184 48187 48205 48207 48225 48222 48253 48230 48256 48297 48257 48269 48313 48270 48279 48290 48332 48300 48314 48316 48334 FERRARI NORTH AMERICA, INC. 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