Siemens MS42 CAN Bus

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CAN Bus on BMWs E46 chassis operates at a speed of 500kb/s and so does the MS42 ECU.

There is a total of 15 message boxes, that can be configured to be received or send by the C167 processor.

The messages are ordered by the CAN registers name inside the CPU beginning with 1 and ending with F. Unused boxes are not listed here.

Siemens MS42 reads the following messages for operation, if the corresponding module is present in car:

Siemens MS42 sends the following messages:


Visualised in Tuner Pro the CAN configuration table looks like this:

Tuner Pro MS42 CAN Init.png


Following values are copied from the MS43 page, so these have to be verified!

DME1 0x316

Refresh Rate: 10ms

  • Byte 0 - Bitfield
    • Bit 0 - LV_SWI_IGK
      Ignition Key Voltage State
      0 = terminal 15 off detected
      1 = terminal 15 on detected
    • Bit 1 - LV_F_N_ENG
      Crankshaft Sensor State
      0 = no CRK error present
      1 = CRK error present
    • Bit 2 - LV_ACK_TCS
      Traction Control State
      0 = either ASC1 was not received within the last 500 ms or it contains a plausibility error
      1 = the ASC message ASC1 was received within the last 500 ms and contains no plausibility errors of the requirements TQI_ASR_CAN / TQI_MSR_CAN
    • Bit 3 - LV_ERR_GC
      Gear Change Error State
      0 = gear change not or partly possible
      1 = gear change possible
    • Bit 4 - SF_TQD [0]
    • Bit 5 - SF_TQD [0]
      Charge Intervention State
      0 = the required intervention can be performed completely or if there is no ASC requirement.
      1 = the required intervention cannot be performed completely because the IGA retard limit is reached.
      2 = the required intervention cannot be performed completely because the charge actuators are fully closed (this case is not possible with MTC without break-away mechanism)
      3 = "limited vehicle dynamics" is active (MTC/ISA error)
    • Bit 6 - Unused
    • Bit 7 - LV_F_SUB_TQI
      MAF Error State
      0 = MAF ok
      1 = MAF error present
  • Byte 1 - TQI_TQR_CAN
    Indexed Engine Torque in % of C_TQ_STND (including ASR/MSR/ETCU/LIM/AMT/GEAR intervention)
  • Byte 2 - N_ENG [LSB]
  • Byte 3 - N_ENG [MSB]
    Engine Speed in rpm
    Calculation = HEX[MSB] * 256 + HEX[LSB]
  • Byte 4 - TQI_CAN
    Indicated Engine Torque in % of C_TQ_STND (based on PVS, N, AMP, TIA ,TCO, IGA, PUC)
  • Byte 5 - TQ_LOSS_CAN
    Engine Torque Loss (due to engine friction, AC compressor and electrical power consumption) in % of C_TQ_STND
  • Byte 6 - TQI_MAF_CAN
    Theorethical Engine Torque in % of C_TQ_STND after charge intervention (based on MAF, IGA)
  • Byte 7 - Bitfield
    • Bit 0 - ERR_AMT_CAN
    • Bit 1 - ERR_AMT_CAN

DME2 0x329

Refresh Rate: 10ms

  • Byte 0 - Multiplexed Information
    • Bit 0 - MUX_INFO [0]
    • Bit 1 - MUX_INFO [1]
    • Bit 2 - MUX_INFO [2]
    • Bit 3 - MUX_INFO [3]
    • Bit 4 - MUX_INFO [4]
    • Bit 5 - MUX_INFO [5]
      MD_NORM = Refactored C_TQ_STND from 0x3FF (0-1023Nm) to 0x3F (0-1008Nm) with decreased resolution of 16Nm
    • Bit 6 - MUX_CODE [0]
    • Bit 7 - MUX_CODE [1]
      0 = CAN_LEVEL
      2 = OBD_STEUER
      3 = MD_NORM
  • Byte 1 - TEMP_ENG
    Engine (Coolant) Temperature in °C
    Calculation = (HEX * 0.75) - 48°C
    Init: 0xFF
    Min: 0x01 (-48°C)
    Max: 0xFF (142.5°C)
  • Byte 2 - AMP_CAN
    Ambient Pressure in hPa
    Calculation = (HEX * 2) + 598hPa
    Init = 0x00
    Min = 0x01 (600hPa)
    Max = 0xFE (1106hPa)
    Error = 0xFF
  • Byte 3 - Bitfield
    • Bit 0 - LV_SWI_CLU
      Clutch Switch State
      0 = released
      1 = depressed
    • Bit 1 - LV_LEVEL_IS
      Idle Regulator State
      0 = idle above threshold
      1 = idle below threshold
    • Bit 2 - LV_ACK_CRU_AD_ECU
      Acknowledge of ACC1 CAN Message
      0 = nACK
      1 = ACK
    • Bit 3 - LV_ERU_CAN
      Engine Running State
      0 = engine stopped
      1 = engine running
    • Bit 4 - (STATE_CRU_CAN)???
    • Bit 5 - STATE_MSW_CAN [0]
    • Bit 6 - STATE_MSW_CAN [1]
    • Bit 7 - STATE_MSW_CAN [2]
      0 = No Button Pressed (Init Value)
      1 = Set / Acceleration (tip-up)
      2 = Deceleration (tip-down)
      3 = Resume
      4 = Deactivate (I/O)
      7 = Error Condition
  • Byte 4 - TPS_VIRT_CRU_CAN
  • Byte 5 - TPS_CAN
    Accelerator Pedal Position in % of PVS_MAX
    Calculation = HEX / 2.56
    Init = 0x00
    Min = 0x01 (0%)
    Max = 0xFE (99.2%)
    PVS Error = 0xFF
  • Byte 6 - Bitfield
    • Bit 0 - LV_BS
      Brake Switch State
      0 = brake not actuated
      1 = brake actuated
    • Bit 1 - LV_ERR_BS
      Brake Switch System State
      0 = brake switch system OK
      1 = brake switch system faulty
    • Bit 2 - LV_KD_CAN
      Kick Down State
      0 = kick down not active
      1 = kick down active
    • Bit 3 - STATE_CRU_CAN [0]
    • Bit 4 - STATE_CRU_CAN [1]
    • Bit 5 - STATE_CRU_CAN [2]
      0 = LV_CRU_ACT = 0
      1 = LV_CRU_ACT = 1, constant drive (or tip-up / tip-down)
      3 = LV_CRU_ACT = 1, resume
      5 = LV_CRU_ACT = 1, set / acceleration
      7 = LV_CRU_ACT = 1, deceleration
    • Bit 6 - REQ_SHIFTLOCK [0]
    • Bit 7 - REQ_SHIFTLOCK [1]
      0 = no actuation is active
      3 = actuation ISA, MTC or N_SP_IS is active
  • Byte 7 - Unused

DME4 0x545

Refresh Rate: 10ms

  • Byte 0 - Bitfield
    • Bit 0 - Unused
    • Bit 1 - LV_MIL - Check Engine Light
    • Bit 2 - Unused
    • Bit 3 - LV_MAIN_SWI_CRU - CRU_MAIN_SWI
    • Bit 4 - LV_ETC_DIAG - EML Light
    • Bit 5 - Unused
    • Bit 6 - Unused
    • Bit 7 - Unused
  • Byte 1 - FCO - Fuel Consumption LSB
  • Byte 2 - FCO - Fuel Consumption MSB
  • Byte 3 - Bitfield
    • Bit 0 - Oil Level Error LED M5 Cluster
    • Bit 1 - Oil Level Warning LED Every Other Cluster
    • Bit 2 - Oil Level Error LED M5 Cluster
    • Bit 3 - LV_TEMP_ENG - Coolant Overheating Light
    • Bit 4 - M-Cluster Warm-Up LEDs
    • Bit 5 - M-Cluster Warm-Up LEDs
    • Bit 6 - M-Cluster Warm-Up LEDs
    • Bit 7 - Unused
  • Byte 4 - Unused
  • Byte 5 - Unused
  • Byte 6 - Unused
  • Byte 7 - Unused