Legacy installation
This page applies when using Stock, CANTCU OEM+ or compatible third-party TCM software.
For new 8HP45, 8HP70 and 8HP90 installations, Race+ is recommended. Race+ uses the common Race+ 8HP Installation method and does not require the legacy time-delay relay or separate transmission OBD connector.
¶ Initial support v1.0.0
¶ Features
- All models supported - 45/70/90 - RWD/AWD
- Full control & all drive modes (D/S/M)
- ECO Pro/Comfort/Sport/Sport+ modes
- xHP Transmission flash possible
- Custom gear shifter can be used (Suitable CAN-bus or Digital Inputs)
- Shift paddle control by CAN-bus or Digital Inputs
- Wheel speed can be simulated from Output Shaft Speed sensor (OSS) and sent out on CAN
¶ Sensor Requirements
- Brake Switch (ECU or CANTCU)
- DBW Throttle (recommended)
For this legacy software path, the transmission needs to be virginized/unlocked prior to use. Unlocking is done using CANTCU Flasher after installation.
¶ Installation
The CANTCU Controller needs to be installed in a dry place e.g. inside the car, or inside the ECU box if present. The USB-B port on top of the controller should remain accessible for configuration.
Wiring must be done according to the diagrams below.
¶ Power Supply
Power input to CANTCU can be connected together with the 8HP transmission power input. Recommended fuse size for the combined connection is 15 A.
WUP (Wake-Up) of the 8HP and shifter requires +12 V only while ignition is on. This should be controlled by the CANTCU WUP output and connected to all required units.
This legacy installation requires delayed transmission power shutdown on non-OEM installations.
¶ Time Delay Relay
With legacy TCM software, adaptation values are saved after WUP switches off while main transmission power remains active.
Main power should remain available for approximately 45-60 seconds after shutdown.
OEM installations may already provide this behaviour. Standalone and custom installations normally require a time-delay relay.
¶ CAN-Bus
CAN1 and CAN2 are used for legacy 8HP transmission and optional shifter communication.
CAN3 is normally used for vehicle/ECU communication.
Use twisted-pair wiring for CAN.
CAN1 and CAN2 have built-in 120 ohm termination resistors. CAN3 does not.
¶ OBD Connector
A separate transmission OBD connector is required for this legacy installation.
It is connected to CAN1 and can be used for BMW diagnostics and compatible third-party transmission flashing tools such as xHP.
¶ Inputs and Outputs
See the Software section for configurable CANTCU inputs and outputs.
¶ Pinouts and Wiring
¶ Connector Pinouts
¶ Wiring Diagrams
