Web automotive diagnostic and datalogging tool compatible with many pre-OBD2 (1990-1994) Mitsubishi vehicles.
Heavily inspired by original PalmOS MMCd Datalogger. Also big thanks for E932-E931 commented source.
ALL INCLUDED SOFTWARE, HARDWARE AND DOCUMENTATION ARE PROVIDED "AS IS". THE CONTENT IS PROVIDED WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, WARRANTIES OF TITLE, NON-INFRINGEMENT OR IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR OTHERWISE, OTHER THAN THOSE WARRANTIES WHICH ARE INCAPABLE OF EXCLUSION, RESTRICTION OR MODIFICATION UNDER APPLICABLE LAW. THERE IS NO WARRANTY THAT THE INFORMATION OF THE SITE IS ACCURATE, RELIABLE OR CORRECT; THAT THE SITE WILL BE AVAILABLE AT ANY PARTICULAR TIME OR LOCATION; THAT ANY DEFECTS OR ERRORS WILL BE CORRECTED; THAT THE CONTENT IS FREE OF VIRUSES OR OTHER HARMFUL COMPONENTS; OR THAT YOU WILL ACHIEVE SUCCESSFUL RESULTS FROM FOLLOWING ANY INSTRUCTIONS, DIRECTIONS OR RECOMMENDATIONS ON THE SITE.
Application hosted on GitHub pages.
Application is fully functional only on platforms with native Web Serial API support.
Serial API polyfill is installed to expand list of compatible platforms utilizing USB Web API instead. Only USB CDC friendly adapters will work in this case. Most of serial adapters (FTDI, Prologic, Silicon Labs, CH340, etc.) requires proprietary drivers and aren't USB CDC compatible.
- Full support: Windows and Linux OS
- Partial support (USB CDC supported adapters only): ChromeOS and Android
- No support: iOS and macOS
In order to exchange diagnostic data between web application and car you will need 1 or 2 adapter(s) depending on your system:
-
ADLD/ODB1 to RS232 adapter
You can find ready-to-use USB or COM adapters on the web. Also you can use my PCB design to build this adapter yourself.
Notes: most of the adapters multiplex TX data to RX wire, so any request message will be duplicated as a reply immediately and should be ignored.
-
RS232 to USB adapter, if your system doesn't have physical COM port built-in
RS232 to USB adapters tend to have problems. In theory, almost anyone should work. In practice, many USB-UART ICs are counterfeited and/or have poor QC, so it will vary even for the same chip.
Personally, I have encountered problems with Prologic based adapter: response data corruption, only commands work, but queries won't. FTDI based adapter works perfectly. To debug adapter, I would recommend send queries/commands via simplistic terminal application, like: RealTerm
Diagnostic data communication protocol is UART based (1953 baud, 8 bit, 1 stop bit, no parity) in 1 byte request-reply mode with 12V logic level utilizing only a single wire.
- Requests from 0x00 to 0x3D will reply what is stored in RAM by address mapped via ODB lookup table
- Requests from 0x3E to 0x3F will be converted to 0x3D request
- Requests from 0x40 to 0xF0 will reply what is stored in RAM by address from request
- Requests from 0xCA to 0xCA will erase all fault codes and returns 0x00 if engine not rotating. If engine is rotating, all actuators/injector commands are reset and 0xFF is returned
- Requests from 0xCB to 0xF0 will reply what is stored in RAM by address from request
- Requests from 0xF1 to 0xFC will run components diagnostics (injector/actuators) and returns 0xFF if successful
- Request 0xFD will reply with ECU version and return 0xB5 for E931 or 0xB7 for E932
- Request 0xFE will apply resistor strapping low word from t_strap3
- Request 0xFF will apply resistor strapping high word from t_strap3
| Name | Address | Description | Formula | Units | Notes |
|---|---|---|---|---|---|
| PORT1 | 0x00 | Port 1 data register | |||
| PORT2 | 0x01 | Port 2 data register | |||
| PORT3 | 0x02 | Port 3 data register | |||
| PORT4 | 0x03 | Port 4 data register | |||
| PORT5 | 0x04 | Port 5 data register | |||
| PORT6 | 0x05 | Port 6 data register | |||
| TIMADV | 0x06 | Timing advance | x - 10 | ° | |
| ETC-R | 0x07 | Engine coolant temperature (raw) | ECT curve | °C | |
| ISC-0 | 0x08 | Long term correction factors/feedback for the ISC step adjustment | Only low byte | ||
| ISC-Y0 | 0x09 | Short term correction factors/feedback for the ISC step adjustment | Only low byte | ||
| ISC-1 | 0x0A | Long term learning variable when A/C is on | |||
| ISC-Y1 | 0x0B | ISC learning variable when A/C is on and PS is off | |||
| FTRIM-L | 0x0C | Fuel trim (low) | .78 * x | % | |
| FTRIM-M | 0x0D | Fuel trim (middle) | .78 * x | % | |
| FTRIM-H | 0x0E | Fuel trim (high) | .78 * x | % | |
| O2-F8 | 0x0F | Oxygen feedback trim | .78 * x | % | |
| ECT-F | 0x10 | Engine coolant temperature (filtered) | ECT curve | °C | |
| IAT-C | 0x11 | Intake air temperature (checked) | IAT curve | °C | |
| EGRT | 0x12 | Exhaust gas recirculation temperature | -1.5 * x + 314.28 | °C | |
| O2-R | 0x13 | Oxygen sensor | .0195 * x | V | |
| BATT | 0x14 | Battery voltage | .0733 * x | V | |
| BARO-R | 0x15 | Atmospheric pressure | .00486 * x | bar | |
| ISC-C | 0x16 | Current ISC step | step(s) | ||
| TPS-R | 0x17 | Throttle position | 100 * x / 255 | % | |
| CLMF | 0x18 | Closed loop mode flags | flags | ||
| FTRIM-F | 0x19 | Fuel trim flags | flags | ||
| MAF | 0x1A | Mass airflow sensor pulse frequency | 6.25 * x | Hz | |
| FTRIM-1B | 0x1B | Fuel trim (low 0x1B) | .78 * x | % | |
| AIR-8 | 0x1C | Air volume | |||
| ACCENR | 0x1D | Acceleration enrichment | 100 * x / 255 | % | |
| STATE1 | 0x1E | Engine start-up stages and running condition state flags | flags | ||
| FTRIM-1F | 0x1F | Fuel trim (low 0x1F) | .78 * x | % | |
| RPM-8 | 0x20 | RPM (8) | x * 7.8125 | RPM | |
| RPM-31 | 0x21 | RPM (31) | x * 31.25 | RPM | |
| PORT3-S1 | 0x22 | Port 3 snapshot (1) | |||
| ISC-LF | 0x23 | ISC learning flags | flags | ||
| RPM-CT | 0x24 | Current target idle speed | x * 7.8125 | RPM | |
| ISC-T | 0x25 | Target ISC step | step(s) | ||
| KNOCK | 0x26 | Current knock sum | |||
| PORT3-S0 | 0x27 | Port 3 snapshot (0) | |||
| PORT4-S | 0x28 | Port 4 snapshot | |||
| INJ-PW | 0x29 | Injector pulse width | .256 * x | ms | |
| INJ-PW1 | 0x2A | Injector pulse width (+1) | .256 * x | ms | |
| COIL | 0x2B | Coil energization time | |||
| AIR-C0 | 0x2C | Air count (0) | |||
| AIR-C1 | 0x2D | Air count (1) | |||
| INJ-FA | 0x2E | Global injector factor | High bit | ||
| 0x2F | Global injector factor | Low bit | |||
| ISC-F0 | 0x30 | ISC flags | flags | ||
| TEMP1 | 0x31 | Temporary value 1 | |||
| TEMP2 | 0x32 | Temporary value 2 | |||
| TEMP3 | 0x33 | Temporary value 3 | |||
| TEMP4 | 0x34 | Temporary value 4 | |||
| TEMP5 | 0x35 | Temporary value 5 | |||
| O2-BC | 0x36 | Oxygen sensor bad counter | |||
| EGRT-BC | 0x37 | Exhaust gas recirculation temperature bad counter | |||
| FAULT-H | 0x38 | Faults | flags | High byte | |
| FAULT-L | 0x39 | Faults | flags | Low byte | |
| IAT-R | 0x3A | Intake air temperature (raw) | IAT curve | °C | |
| FAULT-SH | 0x3B | Stored faults | flags | High byte | |
| FAULT-SL | 0x3C | Stored faults | flags | Low byte | |
| FTRIM-3D | 0x3D | Fuel trim (low 0x3D) | .78 * x | % | |
| ECUVER | 0xFD | ECU Version |
| Description | Address | Duration | Return values | Notes |
|---|---|---|---|---|
| Clear faults | 0xCA | Immediately | 0x00 if engine is stopped, 0xFF if engine is running | Works only if engine is stopped |
| Activate boost control solenoid | 0xF1 | ~6 seconds | 0x00 if engine is stopped, 0xFF if engine is running | Works only if engine is stopped |
| Activate EGR solenoid | 0xF3 | ~6 seconds | 0x00 if engine is stopped, 0xFF if engine is running | Works only if engine is stopped |
| Activate fuel pressure solenoid | 0xF4 | ~6 seconds | 0x00 if engine is stopped, 0xFF if engine is running | Works only if engine is stopped |
| Activate purge solenoid | 0xF5 | ~6 seconds | 0x00 if engine is stopped, 0xFF if engine is running | Works only if engine is stopped |
| Turn on fuel pump | 0xF6 | ~6 seconds | 0x00 if engine is stopped, 0xFF if engine is running | Works only if engine is stopped |
| Disable injector 6 | 0xF7 | ~6 seconds | 0x00 | |
| Disable injector 5 | 0xF8 | ~6 seconds | 0x00 | |
| Disable injector 4 | 0xF9 | ~6 seconds | 0x00 | |
| Disable injector 3 | 0xFA | ~6 seconds | 0x00 | |
| Disable injector 2 | 0xFB | ~6 seconds | 0x00 | |
| Disable injector 1 | 0xFC | ~6 seconds | 0x00 | |
| Resistor strapping low word | 0x00 | Not tested | ||
| Resistor strapping high word | 0x00 | Not tested |
- Download source files
- Install Node.JS
- Run
npm installin project folder - Run
npm run servein project folder - Open localhost:4200 in web browser