Iveco Daily. Manual — part 394
101864
1) The vehicle risks skidding (oversteering): the ESP brakes the front right wheel.
2) The vehicle recovers stability.
3) The vehicle risks skidding (oversteering): the ESP brakes the front left wheel.
4) The vehicle recovers stability.
Sudden steering
Vehicle running on a slippery road
101865
1) The vehicle risks skidding (understeering): the ESP brakes the rear right wheel and reduces the engine revs number.
2) The vehicle recovers stability.
Figure 131/6
Figure 131/7
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Revi - February 2005
ASR deactivation strategies
- Disabling any engine intervention of the ESP and ASR/MSR
(torque increase/decrease) over the entire speed range.
- Traction Control actuation enabled up to the speed of 60 k.p.h. (electronic locking of differential, with no reference to the
dragged wheels).
- Stability intervention (ESP) enabled over the entire speed range.
- ABS enabled over the entire speed range.
- EBD enabled over the entire speed range.
ASR deactivation is recommended when driving with the snow-chains mounted, or when the wheels sink into gravel,
sand, etc.
NOTE
Recovery strategy in case of component failure
If the warning lights are OFF, all the systems are working.
NOTE
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System failure
(warning light ON)
ESP/ASR
ABS
EBD
Broken component
Steering angle sensor
X
Yaw sensor
X
Brake light switch
X
X
1 or 2 wheel revs sensors
X
X
3 ou 4 capteurs tours roue
3 or 4 wheel revs sensors
X
X
X
Electronic control unit
X
X
X
Solenoid valve hydraulic unit
X
X
X
Pressure sensor, ABS pump motor
X
X
Warning light legend
Warning light ON: ESP/ASR/MSR not working. No action taken by the ESP/ASR on the engine or the brakes.
N.B. Warning light blinking = ESP/ASR coming into operation.
ABS not working
The front axle may get locked sooner than the rear axle. EBD recovery reduces the rear axle pressure.
EBD not working
No correction of the rear axle braking pressure: DANGER OF SPINNING THROUGH 180 DEGREES!
The warning light also warns the driver of low brake fluid level, hand brake ON, brake pads worn.
Installing the esp components
Installation of the electro-hydraulic modulator/control unit is similar in ASB 8 systems, too.
NOTE
102108
1. Acceleration sensor - 2. Yaw sensor - 3. Steering angle sensor - 4. Electro-hydraulic modulator/control unit
Figure 131/8
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Revi - February 2005
ESP system components and calibration
Some modifications or repairs affecting the ESP system components require a calibration procedure.
The repair operations that require the above procedure are detailed as follows:
- Replacing the system’s braking apparatus electronic control unit (incorporated into the electro-hydraulic modulator).
- Replacing the steering angle sensor fitted into the steering wheel.
- Replacing the longitudinal acceleration sensor.
Yaw sensor with built-in side acceleration sensor
Replacing the yaw sensor requires no calibration.
NOTE
102115
It measures the motion of the vehicle around its own vertical axis (yaw) as well as the vehicle’s side acceleration.
These signals continuously inform the control unit about the vehicle’s behaviour.
The comparison between these signals and those from the driver (steering-wheel position, wheel spin number/speed and pressure
on the brake pedal/accelerator position) allows the ESP control unit to define the actions to be taken. The hydraulic unit controls
brake pressure as quickly as possible, separately for every single wheel.
Moreover, the ESP system may decrease the engine revs number by means of the engine control feature.
Figure 131/9
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