PRE-RELEASE
Bus messages, ESP
| Bus messages, ESP |
For a further description of the car's bus system, see System overview, bus and diagnostic communication, petrol .
| ESP uses the following information: |
| Information | Value/Unit | From | Description |
|
Engine rpm
|
rpm
|
ECM
|
ESP uses current engine speed and vehicle speed to calculate the current gear ratio.
|
|
Engine torque
|
Nm
|
ECM
|
ESP uses current engine torque and current gear ratio to calculate the current wheel torque.
|
|
Pedal position
|
%
|
ECM
|
Displays accelerator position, i.e. the driver's intentions, to determine how much wheel spin to permit.
|
|
Current gear ratio
automatic transmission |
1-5 and R
|
TCM
|
ESP uses current gear ratio and current engine torque to calculate the current wheel torque.
The value is compared to the control module's calculated value. |
|
Current gear ratio
manual gearbox |
1-5 and R
|
ECM
|
ESP uses the current gear ratio and current engine torque to calculate the current drive wheel torque. The value is calculated and transmitted by the ECM.
|
|
Steering wheel angle
|
±530°
|
SAS
|
The steering wheel angle sensor sends information on steering wheel position. 0° = straight ahead position.
|
| ESP sends the following information: |
| Information | Value/Unit | Used by | Description |
|
Wheel speed, front right
|
km/h
|
ECM
|
The wheel speed sensor has a voltage output, the frequency of which increases with increased wheel speed. The ESP transmits the current speed of the front right wheel.
|
|
Wheel speed, front left
|
km/h
|
not used
|
The wheel speed sensor has a voltage output, the frequency of which increases with increased wheel speed. The ESP transmits the current speed of the front left wheel.
|
|
Wheel speed, rear left
|
km/h
|
ECM, MIU, DICE, AUDIO, TWICE, SPA
|
The wheel speed sensor has a voltage output, the frequency of which increases with increased wheel speed. The ESP transmits the current speed of the rear left wheel.
|
|
Wheel speed, rear right
|
km/h
|
MIU
|
The wheel speed sensor has a voltage output, the frequency of which increases with increased wheel speed. The ESP transmits the current speed of the rear right wheel.
|
|
ABS lamp
|
ON/OFF
|
MIU
|
Internal diagnosis. In the event of system fault, the ABS lamp comes on.
|
|
ESP OFF
|
ON/OFF
|
MIU
|
Switch and internal diagnosis. The lamp indicates that the ESP function is off.
|
|
ESP indicator lamp
|
ON/OFF
|
MIU
|
Indication of ESP regulation.
|
|
Request for engine torque
|
Nm
|
ECM
|
The ECM controls the engine torque as requested by the ESP control module.
|
|
Calibrated steering wheel angle sensor
|
yes / no
|
SAS
|
The ESP control module sends a message that the steering wheel angle sensor is calibrated, once calibrated by Tech 2. The steering wheel angle sensor adjusts the offset (zero position) to this calibration.
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