Bosch MS4 and Bosch MS4 Sport ECU - Release 1.01 - Supported models and connection guide

Oct 25, 2026

Upload by Rowan

Tutorial for connecting Bosch MS4 and Bosch MS4 Sport ECUs to AiM devices via CAN. It explains two supported physical connection options: using the ECU front left connector or wiring to the 22-pin Deutsch female diagnosis connector. The guide provides ECU pinout information, a connection table for CAN 1 and CAN 2 signals, and a warning to avoid mixing pins from different CAN pairs. It also lists AiM device configuration steps in AiM Race Studio and enumerates received telemetry channels for both MS4 and MS4_SPORT protocols.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages7

Reading Time18 min

AccessFree to download

Supported models

Connection to AiM devices

Connection through 22 pins Deutsch connector

Direct ECU connection

AiM device configuration

Available channels

Bosch MS4 protocol

Bosch MS4_SPORT protocol

AiM Infotech Bosch MS4 and Bosch MS4 Sport ECU Release 1.01 1 Supported models This tutorial explains how to connect Bosch MS4 ECU to AiM devices. Supported ECU models are: • Bosch MS4 • Bosch MS4 Sport 2 Connection to AiM devices Bosch MS4 and Bosch MS4 Sport ECU feature a bus communication protocol based on CAN that can be reached in two ways: • on the ECU front left connector • on the 22 pins Deutsch female diagnosis connector. 2.1 Connection through 22 pins Deutsch connector AiM would recommend this connection. The 22 pins diagnosis Deutsch female connector is on the ECU harness and here below you see its pinout and connection table. 22 pins Deutsch connector pin Pin function AiM cable 4 CAN 1 High CAN+ 16 CAN 1 Low CAN- 2.2 Direct ECU connection Here below is ECU pinout and bottom of it connection table. ECU connector pin Pin function AiM cable 60 CAN 1 High CAN+ 58 CAN 1 Low CAN- 79 CAN 2 High CAN+ 77 CAN 2 Low CAN- Warning: never connect pins belonging to different couples like pin 60 (CAN 1 High) with pin 77 (CAN 2 Low) . 3 AiM device configuration | Before connecting the ECU to AiM device set this up using AiM Race Studio software. The parameters to select in the device configuration are:
• ECU manufacturer: “Bosch”
• ECU Model:
o "MS4" or
o "MS4_SPORT"
4
Available channels | | --- | | Channels received by AiM devices connected to "Bosch" ECU changes according to the selected protocol.
4.1
"Bosch" "MS4" protocol | Channels received by AiM devices connected to "Bosch" "MS4" protocol are: ID CHANNEL NAME FUNCTION ECU_ 1 BOSCH_RPM RPM ECU_2 BOSCH_VEHICLE_SPEED Vehicle speed ECU_3 BOSCH_TPS Throttle position sensor ECU_4 BOSCH_IGNIT_ANG Ignition angle ECU_5 BOSCH_ENGINE_TEMP Engine temperature ECU_6 BOSCH_OIL_TEMP Oil temperature ECU_7 BOSCH_FUEL_TEMP Fuel temperature ECU_8 BOSCH_AIR_TEMP Intake air temperature ECU_9 BOSCH_GEAR Engaged gear ECU_ 10 BOSCH_GEAR_OIL_P Gearbox oil pressure ECU_ 11 BOSCH_FUEL_PRESS Fuel pressure ECU_ 12 BOSCH_WATER_PRESS Water pressure ECU_ 13 BOSCH_ATM_PRESS Atmospheric pressure ECU_ 14 BOSCH_OIL_PRESS Oil pressure ECU_ 15 BOSCH_LAMBDA1 Lambda value 1 ECU_ 16 BOSCH_LAMBDA2 Lambda value 2 ECU_ 17 BOSCH_AFR1 Air/Fuel ratio 1 ECU_ 18 BOSCH_AFR2 Air/Fuel ratio 2 ECU_ 19 BOSCH_INJ_TM1 Injection time 1 ECU_20 BOSCH_INJ_TM2 Injection time 2 ECU_21 BOSCH_FUEL_USED Injected fuel ECU_22 BOSCH_ACC_X Horizontal acceleration ECU_23 BOSCH_ACC_Y Vertical acceleration ECU_24 BOSCH_ACC_Z Lateral acceleration ECU_25 BOSCH_BRAKE_PR Rear brake pressure ECU_26 BOSCH_BRAKE_PF Front brake pressure ECU_27 BOSCH_EXAUST_GAS Exhaust gas temperature ECU_28 BOSCH_SPEED_FL Front Left wheel speed ECU_29 BOSCH_SPEED_FR Front right wheel speed ECU_30 BOSCH_SPEED_RL Rear left wheel speed ECU_31 BOSCH_SPEED_RR Rear right wheel speed 4.2 "Bosch" "MS4_SPORT" protocol Channels received by AiM devices connected to "Bosch" "MS4_SPORT" protocol are: ID CHANNEL NAME FUNCTION ECU_ 1 MS4_RPM RPM ECU_2 MS4_SPEED Speed ECU_3 MS4_TPS Throttle position sensor ECU_4 MS4_GEAR Engaged gear ECU_5 MS4_WH_SPD_FL Front left wheel speed ECU_6 MS4_WH_SPD_FR Front right wheel speed ECU_7 MS4_WH_SPD_RL Rear left wheel speed ECU_8 MS4_WH_SPD_RR Rear right wheel speed ECU_9 MS4_LAM1 Lambda 1 value ECU_ 10 MS4_LAM2 Lambda 2 value ECU_ 11 MS4_OIL_P Oil pressure ECU_ 12 MS4_ATM_P Atmospheric pressure ECU_ 13 MS4_FUEL_P Fuel pressure ECU_ 14 MS4_CRANK_P Crank pressure ECU_ 15 MS4_P1 Pressure 1 ECU_ 16 MS4_OIL_T Oil temperature ECU_ 17 MS4_ATM_T Intake air temperature ECU_ 18 MS4_FUEL_T Fuel temperature ECU_ 19 MS4_ECT Engine coolant temperature ECU_20 MS4_EX_T1 Exhaust gas temperature 1 ECU_21 MS4_EX_T2 Exhaust gas temperature 2 ECU_22 MS4_LAMBDA_T1 Lambda 1 temperature ECU_23 MS4_LAMBDA_T2 Lambda 2 temperature ECU_24 MS4_BATTVOLT Battery supply ECU_25 MS4_MIL

FAQs

What Bosch MS4 ECU models are supported for AiM connections?

The guide supports Bosch MS4 and Bosch MS4 Sport ECUs.

What are the two ways to connect the Bosch MS4 ECU to an AiM device?

Connections can be made through the ECU front left connector or through the 22-pin Deutsch female diagnosis connector (recommended by AiM).

What safety warning is given when wiring CAN signals?

Never connect pins from different CAN couples together (for example, CAN 1 High with CAN 2 Low).

How do the received AiM channels differ between MS4 and MS4_SPORT protocols?

The MS4 protocol uses channels like BOSCH_RPM, BOSCH_VEHICLE_SPEED, and BOSCH_IGNIT_ANG, while the MS4_SPORT protocol uses channels such as MS4_RPM, MS4_SPEED, and MS4_TPS, along with sport-specific wheel speed and pressure/temperature signals.

Oct 25, 2026

Upload by Rowan