CAN Bus database: Difference between revisions
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Revision as of 16:28, 9 April 2015
CAN bus mappings by OEM ECU and aftermarket device
OEM ECUs (Non OBD-II protocol)
BMW E46
- 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
- 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 )
- 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
- 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 | 1 | |
| 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
- 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 | |
