MyEngine – CarPC-based trip computer
MyEngine is a program that lets you use your CarPC as a trip computer with engine-diagnostic functions. MyEngine reads data through the diagnostic connector (DLC1 or DLC2) via the Toyota Data Stream protocol (OBD I standard). Most Toyota vehicles produced before 1998 (before switching to OBD II) are equipped with this protocol.
Any computer with a CPU of at least 1 GHz running Windows XP∕Vista∕7 will work with MyEngine. The program is undemanding in terms of RAM or storage. The computer must have a hardware COM port; if it does not, you will need a USB-to-COM port emulator.
The program is free for personal use!
Main MyEngine window
Displayed parameters
- Average fuel consumption per 100 km
- Instant fuel consumption per 100 km
- Average fuel consumption per hour
- Instant fuel consumption per hour
- Fuel used, L
- Fuel remaining in tank, L
- Distance until stop without refueling, km
- Fuel saved, L
- Speed, km/h
- Average speed, km/h
- Maximum speed, km/h
- Total time, hh:mm
- Driving time, hh:mm
- Stopped time, hh:mm
- Current trip distance, km
- Total distance, km
- Trip A distance, km
- Trip B distance, km
- Injector pulse width, ms
- Ignition advance angle, °
- Idle-valve position, steps; %
- Engine speed, rpm
- MAP∕MAF∕VAF sensor value, kPa; mm Hg; g/s; V
- Coolant temperature, °C
- Throttle angle, °; %
- Left correction, V; %
- Right correction, V; %
- Flag parameters (indicate state or event):
- Post-start enrichment (enabled | disabled)
- Cold engine (yes | no)
- Detonation (yes | no)
- Additional enrichment (enabled | disabled)
- Starter (on | off)
- Throttle valve (open | closed)
- Air conditioner (on | off)
- Neutral gear (engaged | disengaged)
- Mixture Left (rich | lean)
- Mixture Right (rich | lean)
In addition, MyEngine can display raw flag parameters from the Toyota Data Stream protocol. Such parameters start with digits – XX.Y, where XX is the byte number and Y is the undecoded bit.
The accuracy of calculations and displayed data depends on many factors: cable build quality, connection reliability, interference from the engine and other vehicle mechanisms, and (!) driving style (the smoother you drive, the more accurate the distance and fuel-consumption calculations). In any case, do not rely completely on the distance and fuel-consumption values reported by MyEngine.
Connecting to the car
- Two wires (twisted pair recommended to reduce interference) to connect the computer to the vehicle’s diagnostic connector
- Capacitor 1.5–3.3 nF (1500–3300 pF)
- Female COM-port plug
- The first wire connects the VF1 pin of the diagnostic connector to pin 6 of the COM port
- The second wire bridges TE2 and E1 pins in the diagnostic connector and connects to pin 5 of the COM port
- Solder the capacitor between wires 1 and 2
- Cable assembly diagram:
Locate the VF1 (ENG), TE2 and E1 pins in the diagnostic connector. DLC1 is usually in the engine bay; DLC2 is under the steering column. Connect the assembled cable to the computer and the vehicle’s DLC connector as per the diagram above.
Start MyEngine and switch the ignition on. The Check-Engine light on the instrument panel often flashes (if not, check the cable and connection). The current coolant temperature will appear in the Temperature field of MyEngine’s main window. Start the engine.
Download
READ BEFORE DOWNLOADING! THE MyEngine SOFTWARE (THE “SOFTWARE”) IS PROVIDED “AS IS” WITHOUT ANY WARRANTIES OF ANY KIND. THE AUTHOR SHALL NOT BE LIABLE FOR THE SOFTWARE FAILING TO MEET USER EXPECTATIONS, FAILING TO MATCH ANALOGS OR STANDARDS NOT DESCRIBED IN SPECIFICATIONS OR DOCUMENTATION, OR FOR ANY DIRECT OR INDIRECT CONSEQUENCES OF USING THE SOFTWARE, INCLUDING THOSE ARISING FROM POSSIBLE ERRORS OR TYPOS. ALL RISKS ASSOCIATED WITH USING OR REPRODUCING THE SOFTWARE AND DOCUMENTATION ARE BORNE BY THE USER.
WARNING! DO NOT OPERATE THE PROGRAM WHILE DRIVING. DISTRACTION CAN LEAD TO AN ACCIDENT. YOU ASSUME FULL RESPONSIBILITY AND RISK WHEN USING THIS PROGRAM.
MyEngine 1.3.2
Changelog:
- The warning window about the danger of using the program while driving now appears once a week
- The appearance of the value-selection window has been updated
- Prevented multiple instances of MyEngine from running simultaneously
- Added a clock with current time to the bottom of the main window
- Added “Saved, L” parameter (shows approximate fuel saved when driving in fuel-cut mode)
- The “Cruise display” and “Odometer” fields now react to clicks anywhere and keep their position after restart
- Added options “Minimize on start” and “Hide when minimized”; the running program is also shown in the system tray
- Engines 5A-FE and 5S-FE added to the injection-parameter presets
Source code
Frequently Asked Questions (FAQ)
Before using MyEngine or sending an email question, please read the list of frequently asked questions – open FAQ.
Discussion
- Software trip computers for CarPCs (including MyEngine) are discussed on the forum –
http://carina-e.ru/viewtopic.php?t=9098
(thanks to users avgefke, chem407, Fuse, БелыйГусь, GASCHE, Mouflon, instalator of this forum for materials, support and valuable advice)
- MyEngine discussion on Drom.ru – CarPC-based trip computer (MyEngine)
OBD I Diagnostics – CarTester 8000
While MyEngine displays diagnostic parameters in real time, full engine analysis needs more. For data collection and analysis (graphs, logging, frame-by-frame playback) use CarTester 8000, developed by chem407 with improvements by Fuse.
The project was hosted at http://rocketman.by.ru/, but the free by.ru hosting was closed on 1 December 2011. You can download the archived program here: Download CarTester 8000
OBD I Diagnostic – CarTester 8000 English version
MyEngine is a trip computer based on PC. Use CarTester 8000 for real-time diagnostics. CarTester 8000 allows you to collect and analyze data via the OBD I protocol.
Contacts