Bus messages, ESP

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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.