CAN Bus database

CAN bus mappings by OEM ECU and aftermarket device

OEM ECUs (Non OBD-II protocol)

BMW E46

Installation instructions

• Baud Rate: 500K
• Little Endian Format

BMW E46 (including M3)
Channel	Units	CAN Id	Offset (bytes)	Length (bytes)	Conversion	Notes
TPS	%	809	6	1	(B6 / 255)
EngineTemp	C	809	2	1	(B2 * 0.75) - 48.373	Convert to Farenheight: (temperatureC * 1.8) + 32
OilTemp	C	1349	5	1	B5 - 48.373	Convert to Farenheight: (temperatureC * 1.8) + 32
RPM		790	3-4	1	((B4 * 256) + B3) / 6.4

Mini Cooper R53

Installation instructions

• Baud Rate: 500K
• Little Endian Format

Mini Cooper R53
Channel	Units	CAN Id	Offset (bytes)	Length (bytes)	Conversion	Notes
TPS	%	809	6	1	(B6 / 254) * 100
EngineTemp	C	809	2	1	(B2 * 0.75) - 48.373	Convert to Farenheight: (temperatureC * 1.8) + 32
RPM		790	3-4	1	((B4 * 256) + B3) / 6.4

Aftermarket ECUs

Motec M84

• Standard Channel Mapping for Motec M84 ECU
• Big Endian (MSB) data format

Motec M84
Channel	Units	CAN Id	Offset (bytes)	Length (bytes)	Multiplier	Adder	Notes
RPM	RPM	?	0	2	1	0
TPS	%	?	2	2	1	0
MAP	kPa	?	4	2	1	0
AIT	C	?	6	2	1	0
EngineTemp	C	?	8	2	1	0
AFR	Lambda	?	10	2	1	0
FuelPress	kPa	?	20	2	1	0
OilPress	kPa	?	24	2	1	0
Speed? (Dig In 1 Speed?)		?	52	2	1	0	Need to verify this field
InjDutyCyc	%	?	110	2	1	0

Megasquirt CAN ( MS2/MS3/MS3 Pro )

Installation instructions

• Baud Rate: 1MB (Configurable in Megasquirt)
• Values in big endian format
• Default base CAN id: 1520
• Full CAN bus mapping for Megasquirt

Megasquirt CAN (Dashboard Mode)
Channel	Units	CAN Id	Offset (bytes)	Length (bytes)	Conversion	Notes
In development

Megasquirt CAN (standard mode)
Channel	Units	CAN Id	Offset (bytes)	Length (bytes)	Conversion	Notes
RPM	RPM	1520	6	2	(B6 * 256) + B7
IgnTiming	Degrees	1521	0	2	((B0 * 256) + B1) / 10
AFR	AFR	1521	4	2	((B4 * 256) + B5) / 10	Legacy AFR1 (Deprecated on MS3) - to use AFR2 specify offset 6
MAP	kPa	1522	2	2	((B2 * 256) + B3) / 10
MAT	F	1522	4	2	((B4 * 256) + B5) / 10
EngineTemp	F	1522	6	2	((B6 * 256) + B7) / 10
TPS	%	1523	0	2	((B0 * 256) + B1) / 10
EngineTemp	F	1522	6	2	((B6 * 256) + B7) / 10
Knock	%	1524	0	2	((B0 * 256) + B1) / 10	Indication of knock input
AFR	%	1551	0	1	B0 / 10	AFR for cylinder #1 (MS3+ compatible) - add 1 to offset for subsequent AFR inputs

MBE Systems 992

Installation instructions

• Baud Rate: ???
• Little Endian format

MBE Systems 992 (Locked Caterham mode)
Channel	Units	CAN Id	Offset (bytes)	Length (bytes)	Conversion	Notes
EngineTemp	C?	814	0	1	B0	Need to verify scaling and temperature units
RPM	RPM	814	1	2	(B2 * 256) + B1
TPS	%	814	3	0	B0 / 5.0	Outputs as throttle voltage. assuming a 0-5v system, scale by 5v
OilPress	PSI?	815	2	1	B2	Need to verify scaling and Pressure units
OilTemp	C?	815	3	1	B3	Need to verify scaling and temperature units

Tire Pressure Monitoring Systems (TPMS)

Brightwater Technologies

• Baud Rate 1MBPS (500KBPS optional)
• Big Endian (MSB) data format
• Integration Details

Brightwater TPMS
Channel	Units	CAN Id	Offset (bytes)	Length (bytes)	Multiplier	Adder	Notes
TirePres_RF	PSI	1440	2	2	0.01	0
TireITmp_RF	C	1440	3	1	0	-40	Internal Tire Temperature
TirePres_LF	PSI	1441	2	2	0.01	0
TireITmp_FL	C	1441	3	1	0	-40	Internal Tire Temperature
TirePres_RR	PSI	1442	2	2	0.01	0
TireITmp_RR	C	1442	3	1	0	-40	Internal Tire Temperature
TirePres_RL	PSI	1443	2	2	0.01	0
TireITmp_RL	C	1443	3	1	0	-40	Internal Tire Temperature

Cameras

AIM Smarty CAM CAN protocol

Installation instructions

• Baud Rate: 1MB
• Values in little endian format

AIM Smarty CAM protocol
Channel	Units	CAN Id	Offset (bytes)	Length (bytes)	Multiplier	Adder	Notes
RPM	RPM	1056	0	2	1	0
EngineTemp	C	1056	6	2	0.1	0
OilTemp	C	1057	4	2	0.1	0
OilPress	Bar	1057	6	2	0.01	0
TPS	%	1058	2	1	1	0
Fuel	L	1070	0	1	1	0