3308555 - 5580E anti-theft device
INTRODUCTION
The vehicle is fitted as standard with an ALFA ROMEO CODE immobilizer system to protect against theft.A system with volumetric protection and an alarm is available on request.ALFA ROMEO CODE
To increase protection against theft attempts, the vehicles have bee fitted with an electronic engine immobilizer system known as the "ALFA ROMEO CODE".The keys are equipped with an electronic transponder which transmits a coded signal to a special electronic control unit. If it recognizes the code sent, it allows the engine to be started up.New design system with cipher code
The second generation Code system has the same operating logic as the previous system already used on all Group vehicles, with the exception of the following variants:
- the code used in the dialogue, which takes place via the aerial, between the Code control unit and the key varies each time the engine is started up ("ROLLING CODE") and is in cipher: therefore the code cannot be reproduced, even with an electronic scanner
- Master key eliminated: two keys which have already been "programmed" for both the Code system and the alarm (remote control), if fitted, are supplied
- Code control unit with direct autodiagnosis
- programming of codes in a DATA BASE managed by PARTS DEPT. Therefore when the new vehicle is handed over to the customer, the service network should not carry out any programming procedure for the Code or the alarm.
The Code system consists of:
- two (or more) electronic keys
- a Code electronic control unit, with a serial line for communication with the engine control unit
- aerial in the ignition switch
- Code Card for the emergency starting procedure.
Keys
2 keys are supplied, for a maximum of 8, with a transponder and remote control (if an alarm is fitted) The transponder is an electronic device, NOT supplied by the battery, which contains a special "ID" code (different for each key and not in cipher) and the secret code connected to the vehicle Code control unit.When the key is inserted in the ignition, in the ON position, the transponder is energized by radio waves from the aerial around the key lock barrel and automatically responds by emitting a code. The remote control contains a specific code (see DESCRIPTION AND OPERATION: Alarm). | The keys are supplied already "programmed" by the production plant. All the codes are then memorized in a DATA BASE managed by the PARTS DEPT. Therefore, when the new vehicle is handed over to the customer, the Service Network should not carry out any programming procedure. If the keys are mislaid or additional keys are requested, put in an order to the PARTS DEPT. following the procedure described below. |
Code control unit
The main function of the Code control unit is to recognize the key inserted in the ignition switch.The Code control unit is also responsible for programming the keys and the Code warning light.The Code control unit contains the secret code used in the dialogue which takes place via the aerial between the Code control unit and the key transponder.It also contains the codes for the enabled keys (IK1 and ID2) and the "FIX CODE" (non cryptic code used in the dialogue between the Code control unit and the engine control unit: when the key is turned to the ON position for the first time, if the key is recognized, the FIX CODE is transferred to the engine control unit).The Code control unit has a direct diagnostic line, independent from the engine control unit line.The Code control unit and the engine control unit "converse" via a serial line with a single cable.The serial line is the two-way type: this means that the information travels in a sequential fashion from the engine control unit to the Code control unit and viceversa.
Dialogue between the code control unit, key and engine control unit
With the ignition key in the ON position, the engine control unit asks the Code control unit for the FIX CODEThe Code control unit asks the transponder in the key for IDThe transponder transmits ID1 to the Code control unit where the ID received is compared with the enabled onesIf the ID received is amongst the enabled ones, the secret code is checked through a coded dialogue between the Code control unit and the transponderIf this recognition takes place, the Code control unit sends the FIX CODE to the engine control unit, which checks that it conforms and enables the starting and running of the engine. The Code warning light goes outIf this recognition does NOT take place, the Code control unit sends a special code to the engine control unit which does not allow the engine to be started up. The Code warning light remains on constantly.The logic of the dialogue between the two control units is summarized in the diagram below:
Code system warning light
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If the ignition key is turned to the ON position, the indicator can signal one of the following conditions:
- on briefly (0.7 s) and then off: key recognized, system operation correct;
- on constantly: the control unit has detected one of the following faults:
Code card
The card contains the following:
- the emergency electronic code which allows the vehicle to be started using the Examiner or other diagnostic instrument or, in an emergency, using the accelerator pedal
- the mechanical code.
 | The Code Card should not be left in the vehicle in case it is stolen: it should, however, be available for the emergency starting procedure. |
System autodiagnosis
The control unit carries out a continuous autodiagnosis of the system operation. In particular:
- it detects and memorizes any faults
- it recognizes the various components and the type of fault
- it signals the onset of these faults via the special warning light in the instrument panel.
The control unit provides information on:
- the state of the control unit: it indicates whether the control unit is correctly programmed and operational, if it is unusable, or if the "Key Programming" procedure has not been carried out (new control unit ordered from PARTS DEPT.)
- the state of the Code warning light: on or off (it makes it possible to identify any irregularities in the warning light connections)
- the state of the key (correctly programmed or not)
- the number of keys enabled.
The control unit then recognizes faults in all the system components:
- Code control unit
- aerial
- key transponder
- serial line with engine control unit.
It is also possible to carry out the following procedures using the Examiner:
- Key programming
| Any keys no longer present are automatically and definitively cancelled in a new programming. |
Emergency starting procedure
The emergency starting procedure makes it possible to start up the engine if there is a problem in the Code system (Code control unit faulty, keys unusable, etc.), i.e. if the engine control unit has not received the go ahead for starting from the Code control unit.This operation is useful for starting up the engine and driving the vehicle to a Service Centre to have the fault repaired.This procedure can be carried out using the Examiner or - only in emergencies - using the accelerator pedal:By acting on the accelerator pedal, the emergency code is transmitted to the injection control unit through the signal detected by the butterfly valve.Carry out the following operations in the order given:1. Read the emergency code on the Code Car.2. Turn the key to the ON position; press the accelerator pedal and keep it pressed.The injection failure warning light should come on for 4 seconds, then go out briefly (150 ms.) and come on again for another 4 seconds.3. When the warning light goes out, release the accelerator pedal.4. When the pedal is released, the warning light should start to flash (at a frequency of 0.8 Hz).5. After a number of flashes equivalent to the first figure of the code on the Code Card, fully depress the accelerator pedal and keep it depressed.6. The injection warning light should come on again for 4 seconds and then go out to indicate that the first figure has been accepted.7. When the warning light goes out, release the accelerator pedal.8 When the pedal is released, the warning light will start to flash again as before (frequency 0.8 Hz).9 After a number of flashes equal to the second figure, press the accelerator pedal; the warning light should come on for 4 seconds to indicate that the second figure has been accepted.10 Repate the above for the other figures in the emergency code.11. When the pedal is released after the last figure has been accepted, the warning light should flash for around 4 seconds at twice the frequency (1.6 Hz) to indicate that the entire code has been accepted. If, on the other hand, the warning light remains on, this means that the code has been rejected.12. If the code has been accepted, start up if the engine; if this is not the case, turn the ignition to the OFF position and try the operation again.The graph illustrates pedal operations and warning light flashes for the code 42173 given by way of example.
Data base
There is a centralized DATA BASE (for all markets) managed by the PARTS DEPT. for ordering all system components.The production plant transfers all the necessary data into this DATA BASE together with the chassis number of the new vehicle.This PARTS DATA BASE is then referred to for executing an order for replacement components received from the Service Networ,.The DATA BASE contains various information, including:
- vehicle chassis number
- ID1, ID2, (up to a maximum of 8)
- PASSWORD (*)
- mechanical key code.
- (*) For versions with an alarm, there are special codes for the remote controls for each key: a remote control cannot be recreated with the same code as the one lost.
Intervention procedures
Key(s) mislaid:1. Ask the customer for all the keys remaining in their possesion. They must also prove that they own the vehicle by showing the registration document and a valid identity document.2. Carry of the PROGRAMMING OF THE KEYS remaining using the Examiner or other diagnostic equipment working on the Code control unit. In this way keys which have not been presented will never be able to be used. A list of keys which are still valid will also be printed.3. Versions with alarm only. MEMORIZE THE REMAINING REMOTE CONTROLS using the Examiner or another diagnostic instrument, working on the alarm control unit. In this way keys which have not been presented will no longer be able to be used.4. Connect to the FIAT PARTS DEPT. giving the| ... DATA ERROR - CROPPED TEXT | Ошибка данных - Текст обрезан ... |
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