WinALDL - 160 baud ALDL reader WinALDL - 160 baud ALDL reader WinALDL is a program that reads the ALDL data from some supported ECM types. The data is presented in a way that will help when tuning a car after engine modifications. A simple hardware interface must be built to convert the ALDL data stream and make it compatible with a PC serial port The original idea for this program came from Ken Kelly. At first we just wanted to write a good free scanner for the 1227747 ECM. Then We added another one.
I have used information found on the internet when writing this software. I don't have access to the ECM's supported, so I can not test everything. Please let me know if you find something wrong and I will try to fix it. If you have a 160 baud ECM that is not supported you can still use the raw data logging.
I might be able to add support for more ECM's, but I need information about the 160 baud data stream for that ECM. List of WinALDL is FREE. If you feel like saying thank you for the software and wish to donate a buck, you can use the PayPal button to the left. Otherwise, ignore the button and use the software anyway. Requirements A PC with a serial rs232 port running a Win32 enviroment. ( Windows 95/ 98/ ME or Windows NT / 2000 / XP ) Installation Start the installation by executing the downloaded file.
How to install and activate MASTERCAM X9 + torrent. Torrent file: http://adf.ly/1oEoln. X torrent free download.
For most users the default selections can be used. When installed WinALDL will apear in the start menu. 62517 Total visitors e-mail.
1982-1995 GM ALDL PC hardware and software for diagnostic code reading and real-time data logging on the cheap. Or at least a whack at it.
It's a proprietary GM PWM TTL level Serial communications protocol. It was not standardized even loosely within GM divisions. It varied greatly by model, nameplate, year, and even engine choice.
ALDL is not always OBD 1 but OBD 1 was ALDL. OBD 1 was the 1991 California stab at standardization of automotive diagnostics prior to Federal adoption of the much more comprehensive SAE OBD II standards. Mr Goodwrench used the Tech I and later the Tech II to communicate with these vehicles. If you can find a working Tech I or a real Tech II they can have more functionality than any aftermarket solution depending on your needs.
The Tech I is all but extinct (I haven't seen one for sale in over 2 years). Most of us can't afford a real Tech II and those are getting scarce. If I could afford a real Vertronix or HP Tech II I don't feel confident that I could weed out the Chinese counterfeits. There seem to be more poorly constructed Chinese knockoffs than the real thing now and they are priced the same or more.
12 terminal ALDL jack (OBD I) Repair parts with terminals. A ECM Ground B) Diagnostic Enable C ECM to Air Switch Solenoid D CLCC (If used) 160 Baud Serial Data TX only (1982-1986 Carburettor Trucks) E 160 Baud TTL Serial Data TX only F ECM Driver or Vac Switch for TCC G Fuel Pump Prime H RWAL VSS M 8192 Baud TTL serial data TX & RX /FONT Not all positions are populated on all vehicles and usually only one serial data line is present. 1995 16 terminal ALDL Jack (OBD 1.5) This looks like 1996 and later J1962 OBD II jacks because it is physically the same jack.
Electrically it is not the same. I would be sorely tempted to install the old ALDL jack if I owned a 1995 GM. Repair Parts with and 5 Ground 9 8192 Baud bi-directional TTL serial data RX & TX 16ECM + Power/FONT 'Paper clip' method The diagnostic lamp is called several different things. SES (Service Engine Soon) MIL (Malfunction Indicator Lamp) CEL (Check Engine Lamp) these acronyms all refer to the same lamp. If it reliably lights during the bulb check, when the ignition is switched on, this method can probably be used. NOTE: This will not work with 1994 & 1995 OBD 1.5 jacks. With the ignition switched off.
Jumper ALDL jack terminals A & B with a piece of stiff wire or an ALDL Test Key. Further instructions and flash/blink code definitions by year/make/model here. PC Method.
GM used 12 position Delphi Packard 12020043 ALDL diagnostic sockets on most US market vehicles from 1982-1994. 160 baud data on terminal E (sometimes on terminal D) is uni-directional TX only.
8192 on terminal M is bi-directional TX & RX on some models. In late 1994 & 1995 GM used the, soon to be OBD II, J1962 diagnostic socket with 8192 baud bi-directional ALDL data on terminal 9.
You can read codes and some sensor data, like the CTS, MAP, TPS, and O2 sensor directly from the 1982-1995 ECM using the ALDL port. The older ECMs will have less available data. I'm not really sure what you'll get from the early 1982-1986 Electronic Carburettor engines.
I've never tried. You'll need. An old PC or laptop for the garage. Software. 1982 - 1994 use a 12 terminal ALDL cable. It's worth noting. 1995 is the ONLY YEAR that GM vehicles with ALDL have the 16 terminal J1962 'OBD II' interface socket that some folks call OBD 1.5.
It's 8192 baud TTL level serial TX & RX. If you don't have a late 1994 or 1995 don't worry about the orphan 16 terminal ALDL cable.
The PC This used to be the most expensive part. Thankfully the requirements are pretty low even if you intend to use it for OBD II / GMLAN (CAN) diagnostics. A lot of companies and schools are getting rid of their old Windows XP laptops now that support for XP really has ended. Since a diagnostic laptop doesn't need to access the internet that's not a problem.
There are some pretty good deals on lightly used brand name laptops right now. Get em while they're cheap and plentiful. Minimum specs needed OBD I, OBD 1.5 &, and OBD II/CAN Diagnostics with Windows XP. The OS tends to determine minimums more than any diagnostic software. Windows XP or Windows 7 Skip Windows Vista. Lithium Ion Battery not Ni-MH.
Dual Core 1.5ghz Processor Windows XP and Windows 7 will run and multi-task better with more processor. USB Port(s). 14' HD screen. WXGA 1280 x 800 is very common. HD is 1280x720.
More pixel density is nicer. My 13 year old HP NX7400 is 15.4' WUXGA 1920x1200 pixels. 32 bit Windows XP will not address more than 3.25gb RAM but will run better with more than 512mb. Windows 7 should have minimum of 4 gb. 80-100 GB+ HDD. More is usually better but usually costs more.
Above 250-300gb SATA may run into BIOS and operating system (driver needed) compatibility problems on some older Windows XP laptops. For Windows XP make sure there's at least 30-40gb free. 300-500gb is minimum for decent Windows 7 performance.
Whatever you buy be sure it's listed as completely WORKING, has the AC Power supply, has a charged battery even if it's tired (it proves the charge circuit is working), has the Hard drive, has USB ports, and has a legible Microsoft COA sticker just in case you have to reload Windows. If the seller has not wiped the HDD you may want to and re-install a fresh copy of Windows to get rid of the Prior owners personal information, viruses, Pirate software, corrupted registry settings, and other things you just don't want to know about or be associated with.
It's very nice if you can get the OEM Windows install media included because it'll have the drivers you need slipstreamed into the installation media. You can usually find someone to get you bootleg copies of bare bones XP SP1 or SP2 OEM discs to legally use with your OEM COA. Dell, HP, Lenovo, etc have drivers for pretty old machines available for download.
The Dell D500, D600 &, D800 series (D520, D530, D620, D630, D820, D830.) laptops were VERY popular so they are extremely plentiful, they have cheap Lithium Ion batteries, they can run Windows XP Pro or even Windows 7 Pro, many of these older laptops have a real 9Pin RS232 serial port and, most will have at least one or two USB Host jacks. Everything a garage laptop needs. Some of the HP Enterprise class laptops that run Windows 7 like the HP Elitebook 8560P and the older NX series like the NX7400 are getting pretty reasonable but not as reasonable as the used Dell D-series I referenced above. You do get what you pay for because the HP Elitebook has a much tougher Aluminum case than the Dell units and both the Elitebook and NX series have an extended use secondary battery but the batteries are more expensive and less available because the HP was not as popular. Look on laptop forums for what commonly breaks on some of these machines.
For instance. The HP NX series screen hinges tended to break if they were not lubricated. Free ALDL PC Software. is a diagnostic trouble codes reader for GM's 1994-1995 6.5TD trucks. WinALDL will read sensor data.
TunerPRO will read and log sensor data and clear codes. is TunerPRO RT has a not present in TunerPRO. There's a nag reminding you to register. I usually support donationware like this that actually works but you are not required to pay for continued use. Here are some YouTube video searches that should give you an idea of what they are capable of doing and how to use them. Commercial ALDL PC Software I don't own any of these packages. All of them do much more than scan for trouble codes.
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diagnostic scan tool for GM's 1994-1995 6.5TD trucks. It's supposed to be on-par with the GM Tech 1, 1A, & II for these trucks. USB and RS232 ALDL Interface Cables 1982-1994 12 terminal or 1995 16 terminal molded plugs. Commercial cables are fairly inexpensive.
USB or Bluetooth to ALDL 12 & 16 terminal moulded plugs. These interfaces have status LEDs and their has a very very nice feature that I have not seen on any other cable.
Data is dipswitch selectable for D, E, & M you do not have to buy a bare terminal cable to talk to the 'terminal D' CLCC ECMs. USB or Bluetooth to ALDL 12 & 16 terminal moulded plugs. DIY RS232 to ALDL.
Note: Be sure the PC/Laptop has a DB9/DB25 RS232 Serial port on COM1-COM4 with a standard Rockwell compliant buffered UART using standard base addresses and standard IRQ channels. DIY USB to ALDL Note: DIY cables will not have OEM type molded plugs unless you can find a supplier. The molded ends are usually expensive. Hopefully this is useful to you folks. OBD II & CAN.
$5.00 US. Capable of using free and paid plugins and several other features not in the LITE version. You should enable extended GM PIDs. From the main screen press Menu-Settings-Manage extra PIDs/Sensors.
'Menu-Add predefined set-Pontiac/GM/Opel/Vauxall'. You just added all Pre-Defined GM PIDs to the available PID list. Very Useful FREE Torque plugin. After you install this goto Menu-settings-plugins and tick the 'Allow plugins full access check box' TorqueScan will show all the known sensors that it can read from the installed list of PIDs along with the realtime data being read. That's useful enough, but if you want some real magic goto Menu-PID Scanner to scan for additional PIDs while you're on a longer drive. The PID scanner says it will take a long time. Be sure your device is plugged into a charger.
It's worth the wait. The PID Scanner function of TorqueScan will compile a list of all available extended PIDs on your vehicle including those not in the pre-defined list. Note: I use TorquePro with TorqueScan. There are several other OBD II apps in the Play Store. I don't use them so I have no idea of their functionality. Interfaces Bluetooth & USB 1982-1994 ALDL 12 terminal moulded plugs 1994-1995 16 terminal J1962 moulded plugs. 1996-2005 OBDII and 2006 and later J2411 CAN with 16 terminal J1962 moulded plugs.
NOTE Commercial ALDL, OBD II, and even OBD II/J2411 CAN interfaces are again fairly inexpensive. Around $55-$100. ALDL 12 & 16 terminal Interface. Bluetooth to ALDL 12 & 16 terminal moulded plugs. Note: 1320 electronics is the developer of ALDL Scan. Their interface has COM status lights and easy configuration dipswitches.
Their USB-only cable has user selectable switches to select data from pins D, E, & M. The Bluetooth adapters data pin settings are internal jumpers with a default of E & M that covers 90% of users and possible custom configuration of data from D by request. Bluetooth to ALDL 12 & 16 terminal moulded plugs. OBD II & CANBUS J1962 Interface It's worth noting the Chinese ELM327 Bluetooth OBD II interfaces are very very cheap. The price should be a red flag. There are more than a few stories of damaged PCMs using the super Cheap Chinese OBD II devices.
They usually have various issues some large some small. They seem to be luck of the draw. You might not get a lemon but you are very likely to. If you buy one be SURE you can return it if it doesn't work. Don't ask for guidance here making the Chinese interfaces work. Most are full of poorly copied stolen chip designs in either the ELM327 PCM ECM connection or the Bluetooth radio or both and there's no way to tell what you're getting. IMHO the cheap and super cheap Chinese interfaces are not worth your time.
Secure Bluetooth Wireless Goes on sale for $79.95 fairly often. Multi-protocol interface covers OBDII GM (J1857 VPW) & SAE J2411 Single-Wire CAN (GMLAN) and others. Note: TorquePRO; This is the best adapter if you want the fastest PID read speed. Read speeds can be as fast as 100PIDs/sec over Bluetooth (Tested on a Galaxy S4, CANBUS protocol).
This device also offers security to prevent unauthorized use. Hopefully this provides a good jumpstart to your search. Ok I find all of this extremely interesting.
I am very familiar with using Tech I and Tech II units. Use them at work alot. It seems now the only times we use the Tech I is when the odd ball older car comes in which is pretty rare or I use it for my truck. We have 6 Tech II's, all with the 'CanDI' modules and we also have 4 or 5 MDI 1's and we just got 4 MDI 2's.
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So trying to find a scan tool to buy for myself has been a giant pain the butt, I would be happy with a Tech I, however I have found just like you, that finding one of those is not easy. And my work as no interest in selling me theirs. I have a Matco Code reader/clearer that also does I/M monitors and some other things but it only works with OBD II vehicles 1996-present. Since my truck runs on ALDL OBD I, I have to borrow works when I need to communicate with the ECM. So now here are my questions as you seem to have a way better understanding of how this works than I do. I have a laptop that uses Windows 7. What is the easiest way to have all of the functionality of a Tech I to use for my truck.
Even better, I have a Samsung Galaxy S6 Active smart phone, what is the easiest way for my to get all of the functionality of a Tech I on my phone. Honestly on my phone would be even better than my laptop because then I done have to have my nice laptop out where it could get damaged. My phone is about three quarters the size of a Tech II screen and way better than a Tech I screen ever was obviously. So how do I turn my phone in to a working Tech I? I'm only concerned with the trucks OBD I system, if I have an issue with any of my OBD II vehicles, I'll just read codes with my Matco handheld unit and then use a scan tool at work for anything advanced I need. With all the info you provided in your posts and watching the videos and following links, I've become a little lost and confused I will admit.
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Information is more than a little fragmented. I was attempting to put together a place to start. I assume you have a 1982-1986 CLCC (Closed Loop Carburetor Control) ECM with data on terminal D of the ALDL jack? WinALDL states that it supports those ECMs. I'm not sure about ALDL Droid or TunerPRO RT. I quickly looked at the available ADX files and didn't see the 1982-86 CLCC computers listed.
If you have a CLCC truck I would start inexpensive. Get one of the 1320Electronics USB & Bluetooth - ALDL cables and try listening to the ECM with WinALDL on your laptop. 1989 gives you a lot more information than the old CLCC ECMs. If you get a combination Bluetooth and USB interface you have the option of trying the free software on the Droid and the PC with a reliable easy to configure communication interface for both. USB is very reliable on a PC and Bluetooth is very reliable on a Droid. USB is not easy to use or reliable on the Droid and Bluetooth is not reliable on a PC.
Bluetooth reliability on a PC may change for the better as Windows 10 or whatever comes next matures but I will not be holding my breath. Bluetooth needs power.
The interfaces will come with a lighter plug to power them. The 1320electronics combination interface can, by request, accept power from ALDL position G.
I believe 1989 already had position G populated from fuel pump power. If it isn't populated it will not hurt any scan tool to have ignition power there. Install a Metripack 280 Female terminal on a wire in position G and plug the other end into an IGN position in the fuse block. Here are some videos on how to setup TunerPro RT. LS1Tech has a short howto on the LT1 subforum as well. Is it a TBI small block or big block or diesel?
Mine is an 89 but I can communicate with itby selecting 89, 90 or 91 on the scan tool. Is there any way you can change the program options to think it's Annan 89 or 90? Sometimes we have that issue even with new cars, it may be on 07, but for some reason 07 won't work with the function won't work with the function we are trying to preform, selecting an 06 or 08 makes it work fine. Sometimes it's a scan tool glitch, sometimes it's a programming thing in the computers that's just because of some weird voodoo magic from when the car was built at the factory. Doesn't happen alot tho, only every once in a great while.
USB to ALDL CABLE Plug your laptop into the ALDL port of your 82 to 95 GM computer controlled car or truck and see what is happening under the hood. Use as a scan tool. Compatible with GM OBDI data streams that use the 8192 Baud, Pin M protocol AND 160 Baud Pin E protocol. The cable may be ordered with the 12 pin connector shown here, the 94 & 95 16 pin connector, or with universal bare pins. 12 Pin versions have built in the 10K ohm resistor required by some ECMs. The resistor can also be switched off if needed. USB to ALDL Cable comes with 5' USB extension cable, and Driver/Software CD.
This cable is compatible with programs such as WinALDL and TunerPro RT. Use it with your Android device - Works with ALDLdroid! ALDLdroid sold separately - Check compatibility with your android device before purchasing.
Ship to Connector type. What is needed to monitor my engine? There are 3 things needed to access the diagnostic data stream from a GM based On Board Diagnostic 1 ( OBD1 ) system on your 1982 - 1995 car or truck. 1 - A laptop PC with an available USB port 2 - This ALDL to USB cable 3 - A software program running with the correct stream definition for your car or truck FAQs Q - Will this cable work with my OBD1.5? A - Yes it will.
GM used 12 pin OBD1 type and 16 pin OBD2 type connectors on 94 & 95 vehicles. Make sure you order the cable that fits your cars connector. Q.- Will this work with my 94-95 6.5 Turbo-Diesel? A - Yes it will however you will have to download and use GMTD Scan Basic (free) or GMTD Scan Tech ($) from Q - Does this cable include the 10K ohm A-B resistor needed on many 12 Pin 160 Baud ECMs?
A - Yes it does. Q - Can I disable the 10K ohm A-B resistor? A - Yes the 10K resistor can be switched off on the 12 Pin version. Q - Why would I want to disable the resistor?
A - On a few select ECMs the 10K O resistor is not needed for the data flow but does alter the idle speed and timing. On MOST ECMs the 10K ohm resistor either does not affect the ECM operation, OR the 10K ohm resistor is needed for data flow. If you have questions on the 10K ohm resistor contact me.
Q - Can I get a version of the 16 pin cable with the switchable 10K O resistor? A - No, GM never required the 10K ohm resistor on the 16 Pin OBD1 vehicles and thus my 16 Pin cable has none.
160 Baud ALDL Software 160 Baud ALDL Software This document describes simple and freely available software that can be used to display GM's raw 160 baud ALDL data stream available from a vehicle's ECU. The has already been described. This site also has details of a simple to generate the for testing purposes. This software uses a serial port on a standard PC to display the raw ALDL data. The raw data is displayed in real time as a hexadecimal field (two characters with each character ranging from 0 to 9 and A to F), as a decimal value (0 through 255), and as a bit field (eight bits, either 0 or 1).
The basic software, as described here, is free The software may be run on a slow DOS machine (such as the original IBM XT or clone) or on a faster PC, in a DOS box, under any version of windows. As many people now have otherwise obsolete but never-the-less functional older PCs, the idea was to to make the software compatible with as many older machines as possible. Although the software works under Windows, as the software is interrupt driven, under certain conditions, some character bits may be lost. This is a 'feature' of Windows and illustrates that it's not a 'real time' operating system. In general this will not be a problem as some tweaking of the DOS box 'parameters' will solve most problems. Configuration information is read from the PC's file system and this is used to format the display. Screen Display From the left it shows the data byte number (red numbers), the data in hex (white), in decimal (grey) and binary format (eight 0 or 1 digits).
The text in the centre comes from the definition file (ALDL.DEF) and is whatever you wish it to say. The ten hex digits to the right are the last 10 values received. As each new ALDL frame is received, these digits move from the centre to the right hand side and 'drop off the screen'. The right half of the display thus shows how these values are changing over time. The asterisk (.) and I at the top right are for diagnostic purposes and indicate that interrupts are occuring (the I) and that frame synchronisation characters (the.) have been received. A T may also be seen in the.' s position, indicating that timer interrupts are being generated.
The screen shot above was generated by feeding the interface data from the and grabbing the output of a DOS box under Windows 95 (using Paint Shop Pro). Command Line Options Here's and example of a command line: C: ALDL -f=vnaldl.def -com=2 All option keywords are separated from their arguments (if they have one) with an = (equals symbol) or a: (a colon) character.
The whole keyword need not be supplied, the part in uppercase is the minimum that must be used. There must be no space(s) between the option keyword, the seperator, and the argument. The available options are listed below. Note that the help (or?) option does not require any parameter. Here are the command line options that can be set. OPTION FUNCTION? Or help Show a brief help message (displays option keywords, etc.) Com=n n is the COM port to use, it can be 1, 2, 3, or 4.
Port=address address is the hardware I/O address (in Hex) of the COM port. Irq=i i is the IRQ of the COM port (either 2, 3, 4, 5, or 7). File=filename Use this definition file rather than the default ' ALDL.DEF'. Timeout=t t seconds before aborting with no ALDL data (default 3 seconds).
If no options are suppied the program uses the parameters for COM1 (your PC may be using COM1 for your mouse, or a modem). The program then gets the COM port's hardware address from the BIOS. If you have non standard COM port hardware at strange addresses (or IRQs) then you must use the PORT and IRQ options.
Note that in this case both a valid PORT and IRQ must be specified. The available IRQs you can use are 2, 3, 4, 5, and 7. The PORT parameter is NOT checked. The File option overrides the default filename of ' ALDL.DEF'. The Timeout parameter overrides the default timeout period of around 3 seconds. Configuration File This file contains the text that is displayed in the centre of the display.
Only the first 29 characters of each line are used and any following text is ignored. All lines in this text file are displayed up to a maximum of 50 lines. Excess lines are simply ignored. Obtaining the free ALDL Software NEW Download version 1.5A of. This version creates eXcel compatible log files, and can use the RS232 Rx line (as well as the CTS line) to receive 160 baud data.
We have not documented all features of this release yet, but hope its usage will be self evident. Here's a link that describes using the RS232 Rx pin. It also describes a very simple and low cost 2 transistor interface you can use for both 160 and 8192 baud ALDL. Download version (VNALDL.DEF) for a VN/VP Holden Commodore.
Not only those what you can see in 'News' PDF. Esi tronic 2.0. In that PDF you can see only completely new components added to ESItronic.
You can modify the.DEF file for your own vehicle. Don't forget to copy this definition file and rename it ALDL.DEF for the program to work correctly (or use the -File option).
One condition of downloading this software is that you must tell us how it worked with your hardware! Feel free to send me your definition files, and remember to check out Dan Burk's mostly page with lots of US vehicles listed there. Updated Software?
In October 2001 a Windows based ALDL porgram was released. For those people with a limited laptop (less than a 486), we have already updated and added 8192 baud support to our next version of our DOS based ALDLLOG program, and hope to be releasing it soon. Because of the greater information content in 8192 baud data streams, this version has multiple page displays and decodes individual data and status information into real-world scaled values such as temperature, speed, etc. Rather than just raw binary/hex information. We are working on a user configurable definition file format that will allow you to customise your display to your individual requirements.
We may even provide a Windows version for the DOS challenged! To ensure the correctness of this document, we greatly appreciated on the information presented here. Updated 9 Feb 2010 (images).
GM 8192/160 Baud ALDL Interface GM 8192/160 Baud ALDL Interface NEW! We'll soon describe an alternative, possibly cheaper, two transistor circuit. We'll have 160 and 8192 baud software soon too (but see below for a range of free software available now).
A simple hardware interface between GM's 5 Volt and a PC's serial port is described here. This same hardware can be used for earlier 5 Volt and 12 Volt streams. But use if you only need to look at ALDL data.
ALDL 8192 baud Hardware There have been a number of designs published (none by GM) to enable the GM proprietory ALDL data stream to be tapped into. Our design uses a MAX232 (or MAX233) because this is the simplest way to do it. We also avoid using a separate power supply by powering the MAX chip from the PC's serial port (DTR and RTS signals must be set to +ve). This circuit can also be used to read older ECU's 160 baud ALDL signals. Here's our circuit using the MAX232 (or MAX232A). Vehicle signals are on the left, PC signals on the right, with DB9 (and DB25 in brackets) pin assignments shown (pin N on DB9 is N/9, etc.).
Note that the 3.3 uF capacitors (C1-C4) may be reduced to 1 uF if these are readily at hand, or to 0.1 uF if you use the MAX232 A. If you use a MAX233, which has a different pinout to the MAX232, you don't need to use any of the capacitors C1-C4, but the regulator still requires C5 and C6. More information is available, or you can download the data sheets for their. As well, get the from Natsemi, and the from Fairchild. Early ECUs produced a fixed 8192 ALDL data stream when the user placed a 10k ohm resistor between ALDL connector pins A and B. Later ECUs added internal receive circuitry (the chip). For enhanced capabilities, and their firmware was upgraded too.
Software can be used to enable the 8192 ALDL data stream from these later ECUs. The 8192 baud Rx and Tx data to/from the PC is combined with a diode and resistor (D3, R1) before being sent to the ECU. The 160 baud data is sent to the PC and appears as a toggling CTS signal. Thus no mechanical switching is required to select either 160 or 8192 baud data streams.
The diagnostic sense resistor R3 may not be required for later ECUs where software controls the ALDL data. The power supply uses two signal lines (RTS and DTR) from the PC to provide a positive voltage for the MAX chip. The two diodes (D1 and D2) are used to ensure power is available even if only one signal line is positive.
Capacitor C6 ensures the low power 78L05 regulator is stable in operation. Capacitor C5 provides decoupling and filtering from the PC.
C1 through C4 are the charge pump and inverter capacitors - their orientation (assuming you use tantalum types) should be double checked.
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