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
| Megasquirt CAN (Dashboard Mode)
|
| Channel
|
Units
|
CAN Id
|
Offset (bytes)
|
Length (bytes)
|
Multiplier
|
Adder
|
Notes
|
| MAP
|
kPa
|
1512
|
0
|
2
|
0.1
|
0
|
Manifold Absolute Pressure
|
| RPM
|
|
1512
|
2
|
2
|
1
|
0
|
|
| Coolant
|
F
|
1512
|
4
|
2
|
0.1
|
0
|
|
| TPS
|
%
|
1512
|
6
|
2
|
0.1
|
0
|
|
| MAT
|
F
|
1513
|
4
|
2
|
0.1
|
0
|
Manifold Air Temperature
|
| AFR
|
|
1514
|
0
|
1
|
0.1
|
0
|
|
| 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 (WIP)
| 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
|
|
