|
Bus message
|
Type of information
|
Transmitter
|
User
|
Description
|
|
ABS active
|
On/Off
|
TCS/ESP
|
TCM
|
Used to inform TCM during ABS modulation, risk of rapid speed changes
|
|
ESP active
|
On/Off
|
TCS/ESP
|
TCM
|
Used to inform TCM during ABS modulation, risk of rapid speed changes
|
|
Wheel speed front left
|
rpm
|
TCS/ESP
|
TCM
|
Used as reference speed value
|
|
Wheel speed front right
|
rpm
|
TCS/ESP
|
TCM
|
Used as reference speed value
|
|
Automatic selector lever position
|
P, R, N, D, M, Movement in progress
|
TCM
|
SLM
|
Used by SLM to turn on the segment in question in the gear selector coulisse
|
|
Selector lever in position M
|
On/Off
|
SLM
|
TCM
|
TCM goes to M-mode
|
|
Ignition key may be removed
|
On/Off
|
SLM
|
CIM
|
Used by CIM as one of the criteria for allowing the key to be removed. Lever must be in P.
|
|
Brake lights active
|
On/Off
|
REC
|
SLM
|
Used by SLM to release the interlock solenoid for the gear selector lever.
|
|
Instrument lighting, rheostat value
|
%
|
ICM
|
SLM
|
Used by SLM to increase or reduce brightness in gear selector coulisse
|
|
Atmospheric pressure
|
kPa
|
ECM
|
TCM
|
Used by TCM to go into high altitude shifting program due to reduced engine power
|
|
Vehicle speed
|
km/h
|
ECM
|
TCM
|
Used as reference speed value
|
|
Brake pedal, switch active
|
On/Off
|
ECM
|
TCM
|
Used by TCM for torque limitation, max 200 Nm, and engine brake
|
|
Prevent shifting, request
|
On/Off
|
ECM
|
TCM
|
Used by TCM to avoid changing gear e.g. during ESP modulation
|
|
Accelerator pedal, kickdown
|
On/Off
|
ECM
|
TCM
|
Used by TCM when kick down requested
|
|
Accelerator pedal position
|
%
|
ECM
|
TCM
|
Used by TCM (together with output shaft speed) to determine shifting points. If this information is incorrect, the transmission will go into limp-home mode
|
|
Coolant temperature
|
Degrees C
|
ECM
|
TCM
|
Used by TCM for WUSP, Warm Up Shift Pattern.
|
|
Engine, limp home
|
On/Off
|
ECM
|
TCM
|
Informs TCM that the engine has gone into limp-home mode
|
|
Engine warm-up cycle (OBD) ready
|
On/Off
|
ECM
|
TCM
|
Warm-up cycles are used for TCM fault handling. After 40 cycles, a fault code will be cleared if the fault has been rectified and Check Engine is not on for this fault
|
|
Engine braking, fuel cut active
|
On/Off
|
ECM
|
TCM
|
Used by TCM to control slipping lock up
|
|
Engine braking, slipping lock up
|
Permitted/Not Permitted
|
ECM
|
TCM
|
ECM synchronises lock up with fuel cut during engine braking to prevent jarring
|
|
Engine torque, current
|
Nm
|
ECM
|
TCM
|
The value controls SLT requested pressure so that it does not exceed what is presently required by a friction element.
|
|
Engine torque, driver request
|
Nm
|
ECM
|
TCM
|
The value controls shifting points together with output shaft speed
|
|
Engine speed
|
rpm
|
ECM
|
TCM
|
Used to modulate torque converter slip
|
|
Transmission, emission-related fault active
|
On/Off
|
TCM
|
ECM
|
ECM turns on Check Engine
|
|
Shifting pattern to prevent engine jolting, request
|
On/Off
|
ECM
|
TCM
|
Request from ECM to TCM that TCM should change shifting program to prevent engine jolting
|
|
Shifting pattern for catalyst ignition, request
|
On/Off
|
ECM
|
TCM
|
Request that TCM should select special shifting program for faster catalyst ignition
|
|
Vehicle speed
|
km/h
|
ECM
|
SLM
|
If the speed exceeds 12 km/h, SLM will activate the interlock solenoid for the gear selector lever, which is then not locked in N.
|
|
Brake pedal, switch active
|
On/Off
|
ECM
|
SLM
|
Informs SLM that the foot brake is applied, which is the criterion for SLM to release the interlock solenoid for the gear selector lever.
|
|
Key position, ignition switch
|
Lock, Off, On, Start
|
CIM
|
TCM
|
The message wakes TCM (+15) and also informs it that the engine is being started (+50)
|
|
Sentronic, gear change request
|
None, Up, Down
|
CIM
|
TCM
|
The steering wheel buttons are connected to CIM. When the gear selector is in position M, TCM will use the value to change gear manually.
|
|
Immobilizer, transponder OK
|
On/Off
|
CIM
|
SLM
|
SLM does not release the interlock solenoid for the gear selector lever unless the transponder is approved.
|
|
Key position, ignition switch
|
Lock, Off, On, Start
|
CIM
|
SLM
|
SLM is awoken via bus
|
