Fiat MULTIPLA 1.9 JTD 8V da 04/02 a 08/03 – ESP – – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION – WIRING DIAGRAM, LOCATION COMPONENTS, OPERATIONAL DESCRIPTION

Wiring diagram

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Components

Component code	Name	Assembly reference
A1	Battery	B7	Fuse (MAXI FUSE) for ABS	-
B7	Fuse (MAXI FUSE) for ABS	-
B31	ABS fuse	-
C12	ABS front earth	-
D1	Front/facia junction	-
D5	Front ABS coupling	-
D5	Front ABS coupling	-
D20	Facia/rear junction	-
E50	Instrument panel	H1	Ignition switch	H90	Switch control unit	I030	Brake pedal switch ( FRONT )	K58	Steering sensor	-
K70	Front wheel sensor left for ABS	2891642Op. 3340A abs check/adjustment devices
K70	Front wheel sensor left for ABS	K71	Front wheel sensor RH for ABS	K71	Front wheel sensor RH for ABS	K72	ABS pressure sensor	-
K74	Yawing sensor	-
K75	Left rear wheel sensor for ABS	2891642Op. 3340A abs check/adjustment devices
K75	Left rear wheel sensor for ABS	K76	Rear right wheel sensor for ABS	K76	Rear right wheel sensor for ABS	M10	Engine management ECU	-
M50	ABS control unit	2891642Op. 3340A abs check/adjustment devices

Location of components

Get access to all wiring diagrams of the car

Components

Component code	Name	Assembly reference
A1	Battery	B7	Fuse (MAXI FUSE) for ABS	-
B7	Fuse (MAXI FUSE) for ABS	-
B31	ABS fuse	-
C12	ABS front earth	-
D1	Front/facia junction	-
D5	Front ABS coupling	-
D5	Front ABS coupling	-
D20	Facia/rear junction	-
E50	Instrument panel	H1	Ignition switch	H90	Switch control unit	I030	Brake pedal switch ( FRONT )	K58	Steering sensor	-
K70	Front wheel sensor left for ABS	2891642Op. 3340A abs check/adjustment devices
K70	Front wheel sensor left for ABS	K71	Front wheel sensor RH for ABS	K71	Front wheel sensor RH for ABS	K72	ABS pressure sensor	-
K74	Yawing sensor	-
K75	Left rear wheel sensor for ABS	2891642Op. 3340A abs check/adjustment devices
K75	Left rear wheel sensor for ABS	K76	Rear right wheel sensor for ABS	K76	Rear right wheel sensor for ABS	M10	Engine management ECU	-
M50	ABS control unit	2891642Op. 3340A abs check/adjustment devices

DescriptionThe electronic anti-lock brake system (BOSCH 5.7 ABS with ASR) governs braking pressure sent to the wheels and prevents loss of grip under all tyre and road surface conditions.This is combined with an ESP (Electronic Stability Program) 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 ESP 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 ESP 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)The ESP system is always connected to the ASR system.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.ASR comes on automatically whenever the engine is started. The system can be deactivated by operating a button in the dashboard.When the system is off, an LED on the button comes on at the same time as a warning light on the control panel.The ESP, on the other hand, switches on automatically each time the engine is started up and cannot be switched off.ASR/ESP warning light: the warning light flashes when the system cuts in to notifiy the driver that the ASR system has cut in due to road surface grip conditions.When th econtrol unit detects an error in the ASR function or the ESP function, it lights up the warning light constantly. As far as the ABS function is concerned, 2889551SeeE7020ABS . For more details, 2888263Characteristic of working principle3340A(B.S. ANTI-LOCK BRAKING SYSTEM .)The supply lines for the control unit and the various system components (sensors and actuators) are protected by a special maxifuse, located near the control unit, and by a fuse in the engine compartment in the relay and fuse box.The ASR off button is protected by a special shunt fuse, located next to the junction unit.

Functional description The ABS electronic control unit M50 is supplied (at pins 2 and 6) directly by the battery via a line protected by ABS maxifuse B7. The supply controlled by the ignition (15/54) reaches pin 23 from the line protected by the specific fuse B31. The control unit is earthed via pins 1 and 5. The four sensors K70, K71, K75, K76 send wheel speed signals to pins 28-12, 15-16, 13-14 and 30-31 of M50 respectively. The brake pedal switch I30 with the N.A. contact sends an enablement signal to pin 32 of control unit M50; this signal arrives from the line controlled by the ignition (INT) protected by fuse F1 of the junction unit (it involves the same signal that lights up the brake lights See E2021 BRAKE LIGHTS . The switch for the brake pedal I30 with an N.C. contact, on the other hand, sends a go ahead signal to pin 20 of control unit M50; this signal arrives via the line controlled by the ignition (INT) protected by shunt fuse B10. Steering sensor K58 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 management control unit M1 and to the ABS control unit M50, pins 24 and 40. Yaw sensor K74 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 sensor K72 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 . The ABS control unit M50 is connected, via the special CAN line, from pin 22, to the instrument panel E50 to manage the ABS failure warning light, the EBD warning light and the ASR/ESP warning light. The ASR OFF button, located in the switch unit H90, connector C, sends a deactivation signal to pin 27 of M50, whilst the signal that switches on the LED when the system is switched off is sent from pin 18; ; switch H90C is supplied by the line controlled by the ignition (INT) protected by shunt fuse B10.The autodiagnostic data can be read by connecting to connector R10: it receives signals from pin 11 of the control unit M50 via the special diagnostic line.