DSM/On-Board Diagnostics
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OBD/OBDI/OBD1/ALDL
ALDL Adapter
Mitsuduino
- https://www.dsmtuners.com/threads/on-board-diagnostic-between-mitsubishi-ecu-using-arduino.464711/
- http://mitsuduino.blogspot.com/?m=1
- https://gist.github.com/anonymous/5696499/forks
- https://gist.github.com/rizal-azalli/b5b7af16187f2f4d731f#file-obdcodetablevalue
| Sensor | Address | Data Min | Data Max | Function | Unit |
|---|---|---|---|---|---|
| Accel Enrichment | 0x1D | 0x01 == 0% | 0xFF == 100% | y = 100(x/255) | % |
| Coolant Temp | 0x07 | 0x01 == 307deg F | 0xFF == -62deg F | y = -1.45x + 308 | deg F |
| Engine Speed | 0x21 | 0x01 == 31 | 0xFF == 7969 | y = 31.25x | rpm |
| Fuel Trim High | 0x0E | 0x01 == 1% | 0xFF == 199% | y = .78x | % |
| Fuel Trim Low | 0x0C | 0x01 == 1% | 0xFF == 199% | y = .78x | % |
| Fuel Trim Middle | 0x0D | 0x01 == 1% | 0xFF == 199% | y = .78x | % |
| Injector Pulse Width | 0x29 | 0x01 == .256ms | 0xFF == 65.3ms | y = .256x | ms |
| Oxygen Feedback Trim | 0x0F | 0x01 == 1% | 0xFF == 199% | y = .78x | % |
| Oxygen Sensor | 0x13 | 0x01 == .02v | 0xFF == 4.98v | y = .0195x | v |
| Throttle Position | 0x17 | 0x01 == 0% | 0xFF == 100% | y = 100(x/255) | % |
| Air Flow Hz | 0x1A | 0x01 == 6Hz | 0xFF == 1606Hz | y = 6.29x | Hz |
| Air Temperature | 0x3A | 0x01 == 356deg F | 0xFF == -74deg F | y = -1.69x + 358 | deg F |
| Air Volume | 0x2C | 0x01 == 1 | 0xFF == 255 | y = x | |
| Barometer | 0x15 | 0x01 == 0bar | 0xFF == 1.24bar | y = .00486x | bar |
| ISC Steps | 0x16 | 0x01 == 1 | 0xFF == 255 | y = x | |
| Knock Sum | 0x26 | 0x01 == 1 | 0xFF == 255 | y = x | |
| Timing Advance | 0x06 | 0x01 == -9 deg | 0xFF == 245 deg | y = x - 10 | deg |
| Battery | 0x14 | 0x01 == 0.1v | 0xFF == 18.7v | y = .0733x | v |
| EGR Temperature | 0x12 | 0x01 == 595deg F | 0xFF == -94deg F | y = -2.7x + 597.7 | deg F |
| TDC | 0x02 | 0x04 (inverted) | |||
| Power Steering | 0x02 | 0x08 (inverted) | |||
| AC Switch | 0x02 | 0x10 (inverted) | |||
| Park/Neutral | 0x02 | 0x20 (inverted) | |||
| Idle Switch | 0x02 | 0x80 (inverted) | |||
| AC Clutch | 0x00 | 0x20 (inverted) |
| Byte from | Byte to | Description |
|---|---|---|
| $00 | $3d | Regular queries, return the value of the
variables showed in obdTable located below, see each variable definition... First value in table correspond to obd query code $00, increases by 1 for each table value |
| $3e | $3f | Converted to $3d, see that obd code |
| $40 | $c9 | Returns what is stored in that ram address |
| $ca | $ca | Erase all fault codes and returns $00 if
engine not rotating. If engine is rotating, all actuators/injector commands are reset and $ff is returned. |
| $cb | $f0 | Returns what is stored in that ram address |
| $f1 | $fc | Injector/actuators commands, returns $ff if successfull |
| Byte | Description | |
| $f1 | Activate boost control solenoid | |
| $f2 | Unused in code | |
| $f3 | Activate egr solenoid | |
| $f4 | Activate fuel pressure solenoid | |
| $f5 | Activate purge solenoid | |
| $f6 | Turn on fuel pump | |
| $f7 | Disable injector #6 (inoperative in code) | |
| $f8 | Disable injector #5 (inoperative in code) | |
| $f9 | Disable injector #4 | |
| $fa | Disable injector #3 | |
| $fb | Disable injector #2 | |
| $fc | Disable injector #1 | |
| Byte from | Byte to | Description |
| $f1 | $ff | Special queries |
| Byte | Description | |
| $fd | Serial link test, returns $b5 (E931) or $b7 (E932) | |
| $fe | resistor strapping low word from t_strap3 | |
| $ff | resistor strapping high word from t_strap3 | |