DescriptionThe ignition and recharging circuit comprises a battery, starter motor and alternator.The starter motor consists of a direct current motor supplied by the battery and an excitation solenoid. When the ignition key is turned to the extreme position (AVV), the starter motor windings are supplied, producing electro-magnetic forces which rotate the motor pinion. At the same time, the solenoid is energized and operates the mechanism for engaging the pinion in the flywheel ring gear, thus turning over the engine.The alternator recharges the battery during normal engine rotation. The alternator shaft (rotor) is turned by the crankshaft by means of a belt. When supplied with an excitation current, the rotor generates a magnetic field that induces an alternating current in the fixed winding (stator). A diode rectifying bridge located on the back of the alternator transforms the alternating current into a direct current, which is sent to recharge the battery.A voltage regulator, also built into the alternator, maintains a constant voltage supply (about 14V) throughout the load and engine speed ranges.The efficiency of the recharging system is controlled by the Body Computer, which measures the D+ signal coming from the alternator with the engine running (rpm over 700).If a fault is detected, the warning light on the instrument panel is lit up.The Body Computer also acquires the battery voltage in the 6 - 18 V. The information is then supplied on the CAN network for the controls unit node on the door which excludes some services in the case of a voltage drop (for example 3023248SeeE2510COURTESY LIGHTS .
Functional description When the ignition key is turned in the switch H1 to the extreme position (START) - pin 50 - the winding of the solenoid - pin 50 - of the starter motor A20 is supplied. This supply comes from the battery via the line of maxifuse IGN of B99 . Pin 30 of A20 , the actual starter motor, receives the voltage coming directly from the battery A1 . The direct current generated by the alternator A10 (pin B+) is sent to the battery A1 through motor A20 . When the alternator does not turn, and so does not recharge the battery, an earth signal is sent from pin D+ to the Body Computer - pin 19 of connector A: this is connected via the CAN line to the instrument panel E50 and manages, as described above, the switching on of the recharging warning light on the instrument panel E50 .
0Removing201Refitting211. Ensure that the ignition key is in the OFF position, then disconnectthe negative battery terminal (-).2. Open the maxi fuse box cover.3. Undo the bolts securing the 'maxi-fuse' box to the battery.4. Loosen the bolt fixing the battery terminal (+).5. Release the maxi fuse box from the battery and move it to theside.2004975
5530B14
Follow these precautions:769768768
5530B18
Follow these precautions.769On batteries with an opticam hydrometer,electrolyte level and battery charge status can be monitored qualitativelyby examining the indicator colour: a light, bright colour indicates low electrolytelevel: top up with distilled water;a dark colour without a green area in thecentre indicates that the electrolyte level is correct but chargeis low: recharge the battery; a dark colour with a green area in themiddle indicates that both electrolyte level and charge status arecorrect: no action is necessary. For further details, see DESCRIPTION ANDOPERATION - 5580.768Proceed as follows.Check the battery voltage without loadusing the test device recommended by the Service outlets (e.g. 'MICRO360'). Depending on the voltage values measured,which define the state of charge of the battery, proceed as follows:If the voltage without load is less than12.10 V, replace the battery (see op.). 5530B10).If the voltage without load is over 12.10V but less than 12.50 V, recharge the battery (see op. 5530B14).If the voltage without load is over 12.50V, the battery is efficient.If necessary, top up the electrolyte asfollows.Carefully remove the cap strip.Top up with distilled and deionized water,taking care not to allow electrolyte to splash out.768
0Removing201Refitting21Place the vehicle on a lift.Open the bonnet lid.1. Release the retainers (1a) and remove the cover (1b).2004980
5530B40
0Removing201Refitting21Open the bonnet lid.1. Release the retainers (1a) and remove the cover (1b).2004986
5530B52
0Removing201Refitting21Proceed with removal 3025534-5530B10battery - r+r .1. Remove the relay/fuse box cover.2. Undo the nut (2a) and disconnect the earth lead (2b) from therelay-fuse box.2004990
5530B60
0Removing201Refitting213025534-5530B10battery - r+r1. Remove the battery drip tray.2. Unscrew bolts (2a) and loosen bolt (2b) securing the batterycradle.3. Move the battery cradle aside.4. Release the belt retaining stud.5. Remove the belt.2005002
0Removing201Refitting211. Undo the nuts fixing the cover.2. Remove the lid.3. Undo the nuts (3a) and the bolts (3b) fixing the voltage regulator.4. Remove the voltage regulator and brushes.2004969
0Removing201Refitting21Fix the alternator in a viceat the bench.1. Use the special tool (1a) to keep the shaft still and undo thepulley fixing nut (1b).2004970
0Removing201Refitting21Position the vehicle on the ramp.Ensure that the ignition key is in theOFF position, then disconnect the negative battery terminal (-).Proceed with removal 3025001-1016A10sound-proofing cover- r + r .Proceed with removal 3025915-7055B54under-engine guard -r r .1. Undo the lower starter motor retaining bolt.2004922
5520B12
0Removing201Refitting21Position the vehicle on the ramp.Ensure that the ignition key is in theOFF postition, then disconnect the battery negative terminal.
0Removing201Refitting21Fix the starter motor in avice at the bench.1. Disconnect the electrical supply terminal.2. Undo the solenoid fixing bolts.3. Remove the fixed section of the solenoid (3a) and recover thespring (3b). If necessary, remove the mobile part of the electromagnet(3c). Proceed as follows. 2004934
0Removing201Refitting213025802-7040A37fuse box cover - r r1. Disconnect the electrical connections at the front (1a, 1b, 1c,1d, 1e, 1f).2. Undo the bolts fixing the control unit.3. Undo the bolts shown fixing the dashboard cover.2004865
0Removing201Refitting211. Release the retainers for the switch panel from the dashboardtrim.2. Disconnect the electrical connections.3. Recover the switch panel.2005045
0Removing201Refitting213025620-5580E08aerial for alpha code- r r1. Disconnect the electrical connections (1a, 1b) from the ignitionswitch.2. Use a drift and undo the headless bolts (2a); remove the ignitionswitch (2b).7682004913
5520A14
769
5520A16
769
5520A18
0Removing201Refitting211. If necessary, regulate the steering wheel height adjustment lever.2. Undo the bolts fixing the lower trim.3. Remove the lower trim, releasing it from the inner retainersand the steering wheel.2004920
0Removing201Refitting21Ensure that the ignition key is in theOFF postition, then disconnect the battery negative terminal.1. Remove the trim, complete with CITY function selector buttonand A.S.R. off switch, from the housing in the centre console.2. Disconnect the electrical connection for the CITY function selectorbutton.Remove the trim, complete with CITY function selectorbutton and A.S.R. off switch.2003846
2127E08
Connect the Examiner diagnostic equipment.Select 'Alfa Selespeed' on the Examiner.Select 'Control Unit Test' on the Examinerand select the 'Marelli Selespeed Automatic Transmission'.Press 'Active Diagnosis' on the Examinerand select 'Service/end of line self-calibration'.Continue with the procedure on the Examiner.
2127E10
0Removing201Refitting21Ensure that the ignition key is in theOFF position, then disconnect the negative battery terminal (-). 1. Undo the nuts (1a) and remove the cover under the dashboard onthe passenger side (1b).2068266
0Removing201Refitting21Proceed with removal 3025534-5530B10battery - r+r . Proceed with removal 3025540-5530B52Battery DRIP TRAY/SUPPORT- R.R. . 1. Undo the bolts and move the clutch position sensor as necessary.2. Disconnect the electrical connection from the clutch positionsensor.3. Remove the electro-hydraulic selection gearbox position sensor.2068274
2127E50
0Removing201Refitting21Position the vehicle on the rampConnect the Examiner diagnostic equipment.Select 'Alfa 147 speed' on the Examiner.Select 'Control Unit Test' on the Examinerand select the 'Marelli Selespeed Automatic Transmission'.Press 'Active Diagnosis' on the Examinerand select 'Accumulator depressurizing'.Continue with the procedure on the Examiner.Ensure that the ignition key is in theOFF position, then disconnect the negative battery terminal (-). Proceed with removal. 3025915-7055B54under-engine guard -r r1. Disconnect the electrical connection from the electro-hydraulicgear selection hydraulic circuit pressure sensor.2. Undo and remove the electro-hydrauilc gear selection hydrauliccircuit pressure sensor.2068275
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