Wiring diagram - ABS - Fiat DOBLO 1.9 JTD 8V da 12/03
COMPONENTS - ABS - Fiat DOBLO 1.9 JTD 8V da 12/03
| Component code | Name | Assembly reference |
| B1 | Engine compartment junction unit | - |
| B1 | Engine compartment junction unit | |
| B1 | Engine compartment junction unit | |
| B2 | Junction unit under dashboard | - |
| B2 | Junction unit under dashboard | |
| C12 | ABS front earth | - |
| C15 | Facia earth, driver''s side | - |
| E50 | Instrument panel | - |
| E50 | Instrument panel | |
| I30 | Brake pedal switch | - |
| I30 | Brake pedal switch | |
| K70 | Left front wheel sensor for ABS | |
| K71 | Right front wheel sensor for ABS | |
| K75 | Left rear wheel sensor for ABS | |
| K76 | Right rear wheel sensor for ABS | |
| M1 | Body computer | |
| M50 | ABS control unit |
Location of components - ABS - Fiat DOBLO 1.9 JTD 8V da 12/03
COMPONENTS - ABS - Fiat DOBLO 1.9 JTD 8V da 12/03
| Component code | Name | Assembly reference |
| B1 | Engine compartment junction unit | - |
| B1 | Engine compartment junction unit | |
| B1 | Engine compartment junction unit | |
| B2 | Junction unit under dashboard | - |
| B2 | Junction unit under dashboard | |
| C12 | ABS front earth | - |
| C15 | Facia earth, driver''s side | - |
| E50 | Instrument panel | - |
| E50 | Instrument panel | |
| I30 | Brake pedal switch | - |
| I30 | Brake pedal switch | |
| K70 | Left front wheel sensor for ABS | |
| K71 | Right front wheel sensor for ABS | |
| K75 | Left rear wheel sensor for ABS | |
| K76 | Right rear wheel sensor for ABS | |
| M1 | Body computer | |
| M50 | ABS control unit |
Description - ABS - Fiat DOBLO 1.9 JTD 8V da 12/03
The electronic anti-lock brake system governs braking pressure sent to the wheels and prevents loss of grip under all tyre and road surface conditions.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 hydraulic 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.Two adjustment solenoids (one for pressure charging, the other for pressure discharging) are fitted for each wheel.The sensors are active, i.e. they consist of a 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 lload 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.Under these conditions, the rear brake distribution control is also deactivated and the car must be driven with great care.The supply lines for the control unit and the various system components (sensors and actuators) are protected by a special maxifuse, located inside the engine compartment junction control unit.
Functional description - ABS - Fiat DOBLO 1.9 JTD 8V da 12/03
The ABS electronic control unit M50 is supplied (at pins 9 and 25) directly by the battery via a line protected by ABS maxifuse F4 , housed in the engine compartment junction unit B01 . The control unit is earthed at pins 8 and 24.
