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Alfa Romeo GT 3.2 V6 – VDC – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

Wiring diagram - VDC - Alfa Romeo GT 3.2 V6

VDC - WIRING DIAGRAM Alfa Romeo GT 3.2 V6

Components - VDC - Alfa Romeo GT 3.2 V6

Component code	Name	Assembly reference
B1	JUNCTION UNIT	-
B1	JUNCTION UNIT
B2	JUNCTION UNIT UNDER DASHBOARD
B5	MAXI FUSE-1 BOX	-
B99	MAXIFUSE BOX ON BATTERY
C12	ABS FRONT EARTH	-
C15	FACIA EARTH, DRIVER''S SIDE	-
D1	FRONT DASHBOARD COUPLING ( FRONT )	-
D43	DASHBOARD/CENTRE CONSOLE COUPLING	-
D97	SHORT CIRCUITING COUPLING	-
E50	INSTRUMENT PANEL
H1	IGNITION SWITCH
H35	SWITCHES ON TUNNEL ( CONNECTORS )
I30	BRAKE PEDAL SWITCH ( FRONT )
K58	STEERING SENSOR ( FRONT )
K70	LEFT FRONT WHEEL SENSOR FOR ABS ( FRONT )
K71	RIGHT. FRONT WHEEL SENSOR FOR ABS
K72	PRESSURE SENSOR VDC ( FRONT )
K74	YAWING SENSOR
K75	LEFT REAR WHEEL SENSOR FOR ABS ( CONNECTORS )
K76	RIGHT REAR WHEEL SENSOR FOR ABS ( CONNECTORS )
M1	BODY COMPUTER
M10	ENGINE MANAGEMENT ECU	1056B
M10	ENGINE MANAGEMENT ECU
M50	ABS CONTROL UNIT ( FRONT )

Location of components - VDC - Alfa Romeo GT 3.2 V6

VDC - LOCATION OF COMPONENTS Alfa Romeo GT 3.2 V6

Components - VDC - Alfa Romeo GT 3.2 V6

Component code	Name	Assembly reference
B1	JUNCTION UNIT	-
B1	JUNCTION UNIT
B2	JUNCTION UNIT UNDER DASHBOARD
B5	MAXI FUSE-1 BOX	-
B99	MAXIFUSE BOX ON BATTERY
C12	ABS FRONT EARTH	-
C15	FACIA EARTH, DRIVER''S SIDE	-
D1	FRONT DASHBOARD COUPLING ( FRONT )	-
D43	DASHBOARD/CENTRE CONSOLE COUPLING	-
D97	SHORT CIRCUITING COUPLING	-
E50	INSTRUMENT PANEL
H1	IGNITION SWITCH
H35	SWITCHES ON TUNNEL ( CONNECTORS )
I30	BRAKE PEDAL SWITCH ( FRONT )
K58	STEERING SENSOR ( FRONT )
K70	LEFT FRONT WHEEL SENSOR FOR ABS ( FRONT )
K71	RIGHT. FRONT WHEEL SENSOR FOR ABS
K72	PRESSURE SENSOR VDC ( FRONT )
K74	YAWING SENSOR
K75	LEFT REAR WHEEL SENSOR FOR ABS ( CONNECTORS )
K76	RIGHT REAR WHEEL SENSOR FOR ABS ( CONNECTORS )
M1	BODY COMPUTER
M10	ENGINE MANAGEMENT ECU	1056B
M10	ENGINE MANAGEMENT ECU
M50	ABS CONTROL UNIT ( FRONT )

Description - VDC - Alfa Romeo GT 3.2 V6

The antilock braking and anti-slip regulation systems (BOSCH 5.7 ABS with ASR) modulate brake pressure sent to the wheels to prevent loss of grip under all tyre and road surface conditions by cutting in automatically whenever one or both drive wheels begin to slip.The system is designed to complement the normal mechanical braking system and not to replace it. In this way it ensures effective safety in the case of anomalies: the ABS uses the same fluid as the conventional mechanical braking system.Four sensors fitted to the four wheels inform the electronic control unit of wheel speed at every moment. In this way, they detect wheel lock, wheel slip and loss of grip.Under these conditions, the control unit sends specific instructions to solenoids that modulate hydraulic circuit pressure to eliminate lock and restore the car to within grip limits. This ensures the shortest possible stopping distance, without losing control of the steering.The sensors are active, i.e. they consist of a Hall-effect receiver that faces a magnetic coding device built into the hub bearing. Under these conditions, the signal is less influenced by electromagnetic interference and temperature.The control unit also controls brakeforce distribution over the rear axle and thus replaces the mechanical load proportioning valve used previously (EBD function: Electronic Brake Distribution).The control unit is equipped with a self-diagnostic function: when an error occurs in the ABS system, a warning light is turned on and the system is simultaneously deactivated. Under these conditions, the car brakes using only the conventional system.When the control unit detects an error in the EBD function, it simultaneously turns on the ''insufficient brake fluid level'' and ''handbrake on'' warning light as well as the ABS warning light.768Under these conditions, the rear brake distribution control is also deactivated and the car must be driven with great care.The ASR system increases vehicle stability and active safety by controlling drive wheel slip. If slip is caused by excessive power transmission, it cuts in to reduce engine power through communication with the engine management control unit; if slip is detected at a single wheel, the system cuts in to brake the slipping wheel by acting on the modulation solenoid.The ABS-ASR system is combined with a VDC (VEHICLE DYNAMIC CONTROL) system, which controls vehicle stability by modulating drive torque and braking the wheels differentially, if there is a loss of grip, thus helping to return the car to its correct trajectory.The VDC system acts on the engine and brakes to generate a stabilising torque when the ABS sensors detect conditions that could lead to the vehicle slipping.The VDC system includes the following specific components over and above those of the ABS:a sensor which detects the steering wheel position (steering sensor);a sensor which detects the vehicle''s rotation around the vertical axis and side acceleration (centrifugal force) (yaw sensor);a sensor that detects pressure on the hydraulic ABS unit (pressure sensor).By processing information from the sensors, the control unit is able to find out car position moment by moment and compare the position with the driver''s ideal trajectory. If the values do not tally, within a fraction of a second the control unit chooses and implements more effective actions to restore the vehicle to its trajectory immediately: it applies a braking force of different intensity to one or more wheels and reduces power transmitted by the engine if necessary.The VDC comes on automatically when the vehicle is started up and cannot be switched off.ASR comes on automatically whenever the engine is started. The system can be deactivated by operating a button on the central console. When the system is off, a led on the button comes on at the same time as a warning light on the control panel.The warning light flashes when the system cuts in to notifiy the driver that the ASR or VDC system has cut in due to road surface grip conditions.The warning light comes on in fixed mode when the control unit detects an error in the ASR function or VDC function.

Functional description - VDC - Alfa Romeo GT 3.2 V6

The ABS electronic control unitM50 is supplied (at pins 2 and 6) directly by the battery via the line protected by ABS maxifuse B5. The ignition-operated supply (INT/A) reaches pin 23 from the line protected by the fuse F42 of under facia control unitB2. The control unit is earthed via pins 1 and 5.The four sensorsK70, K71, K75, K76 send wheel speed signals to pins 28-12, 15-16, 13-14 and 30-31 of M50 respectively.Brake pedal switchI30,when the brake pedal is pressed, sends an enablement signal (N.O. contact) to pin 32 of control unitM50; the ABS cannot intervene unless the brake pedal is pressed.The switchI30 is supplied when the ignition is switched on (INT) from fuse F37 of junction unit B2.When the pedal is released, the N.C. contact is sent to pin 20 of control unitM50;this contact of switchI30 is supplied when the ignition is switched on (INT) from fuse F35 of junction unit B2.The ''ASR OFF'' control button on panelH35 sends a deactivation signal to pin 27 of M50, while pin 18 viene relays a signal that turns on a led on panel H35 when the system is off. Pin 37 ofM50 emits a discrete speed signal that is sent to Body Computer M1; the same signal is also copied via the CAN network.Steering sensorK58 is supplied by ABS control unit M50 at pin 39 and receives a reference earth from pin 21: the signal that detects sudden changes in steering direction is sent via the CAN line to engine control unit M1 and ABS control unit M50. Yaw sensorK74 is supplied from ABS control unit M50 at pin 39, while it receives a reference earth from pin 21: control and command signals are exchanged with ABS control unit M50, at pins 8, 9, 10 and 41. Pressure sensorK72 is supplied from ABS control unit M50 at pin 42, while it receives a reference earth from pin 25: the pressure detection signal is sent to pin 26 of ABS control unit M50. Pins 24 and 40 of ABS control unitM50 connect to Body Computer M1 and instrument panel E50 via the CAN line to manage the ABS failure warning light and - if the problems affect the EBD function - the low brake fluid and handbrake warning lights. The VDC and ASR functions manage the relevant warning light as described previously.Self-diagnostic data can be read by connecting to connector G of Body ComputerM1 - pin 1: it receives signals from pin 11 of control unit M50 via a special diagnostic line.