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TCM, bus information

TCM, bus information

For further information about the bus, see Description of bus communication

Bus message Unit 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, ECM 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 % MIU SLM Used by SLM to increase or reduce brightness in gear selector coulisse
Vehicle speed km/h ECM TCM Used as reference speed value
Brake pedal, switch active On/Off ECM TCM Used by TCM to deactivate lock up.
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 for kickdown request.
Accelerator pedal position % ECM TCM Used by TCM (together with output shaft speed) to determine gear change points. If this information is incorrect, the gearbox will go into limp home.
Engine, limp home On/Off ECM TCM Informs TCM that the engine management system has gone into limp home.
Engine braking, fuel cut active On/Off ECM TCM Used by TCM to control slipping lock up
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
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 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.
Immobiliser, 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