Connecting COMPUSHIFT to Emtron

HGM and Emtron have worked together to develop a common communication bidirectional communication protocol.
This is enabled on the COMPUSHIFT Sport and COMPUSHIFT Pro when Emtron CAN is selected on the engine type menu.

CAN Messages from Emtron to COMPUSHIFT

11 Bit CAN Id	Byte0	Byte1	Byte2	Byte3	Byte4	Byte5	Byte6	Byte7
0x546	Engine Speed		MAP		Engine Torque		Throttle Area Demand %
0x547	Engine Coolant Temp		Engine Torque (Uncorrected)		Upshift Status		Downshift Status
0x548	Upshift Switch		Downshift Switch		Shift Hold

CAN Messages from COMPUSHIFT to Emtron

11 Bit CAN Id	Byte0	Byte1	Byte2	Byte3	Byte4	Byte5	Byte6	Byte7
0x560	Current Gear		Requested Gear		Current TCC		Selected TCC
0x561	Upshift		Downshift		Shift in Process		TCC Lock in Process
0x562	Shift Control Mode		Fault Count		Commanded Line Pressure		Actual Line Pressure (if sensor is present)
0x563	Transmission Range		Trans Temp		Input Shaft Speed		Output Shaft Speed

Data Encoding

All data is encoding in 16 bits little endian (LSB first), with scaling and encoding as shown below.

Signal Type	Scaling	Offset	Encoding
Gear	1 gear per bit		Neutral: 0x00 Forward ranges: 0x01 to 0x0F Reverse ranges: 0x11 to 0x1F Park: 0x10
Temperature	.1C per bit	40C
Downshift			1 = downshift 0 = inactive
Upshift			1 = upshift 0 = inactive
Pressure	1 kPA per bit	0
Shift Control Mode			Manual = 0 Auto = 1 Switch Shift = 2 Diagnostic = 3 Fail safe= 4
Any Boolean or on/off signal			0 = false, off 1 = true, on
Shaft or engine speed	1 RPM per bit	0

Do NOT drive the vehicle until you have confirmed CAN communications are working properly and you have no trouble codes.

You can diagnose CAN bus problems by going to Diagnostics / Network Diagnostics on the CS Setup App. The CAN 1 Receive Count should be steadily increasing when the ECU’s are communicating correctly. The error counts should always be 0. If you do have errors, do confirm that the CAN bus baud rate is set correctly in Network Setup.