This document describes the Diacom hardware and software package.Tech Edge has no affiliation with the Diacom manufacturer and neither supports nor endorsesthe product. All information and link(s) presented here are believed to be in the publicdomain. We welcome further information regarding this package.
Note that if you need a scan tool then you can build your own quite cheaply,and use our own free software (see last paragraph below).
DIACOM® Marine version 3.0 supports. The Diacom® PC based marine diagnostic system gives you the power and flexibility you need to troubleshoot today’s advanced EFI systems. In addition to supporting sterndrive and inboard marine engines, DIACOM® now supports Mercury outboards.
What is DIACOM?
The DIACOM product is a combination of software and hardware produced byRinda Technologies of 563 N. Elston Ave. Chicago, IL 60630, USA.
DIACOM stands for Diagnostic Interface for Automotive Computers.
Diacom displays diagnostic information, available from a vehicle's ECU, on a PC screen.This process is shown in the diagram and highlights that the Diacom hardware connects to both thevehicles ALDL connector and the PC's parallel port. The Diacom software is controlled from the keyboardand displays results on the PC's screen. Not shown is Diacom software's ability to saveand load information to and from disk.
Rinda's information on Diacom lets you downloada demo. But, as you'll see, it's really an advertisement, but does show Diacom's user interface.Diacom's strength lies not in its relatively unsophisticated software and its very simple hardware,but in the database of vehicles that Rinda maintains and that Diacom therefore supports.
For many early ECUs, Diacom can only tell you very basic information about your vehicle,because that's all that's available from the ECM.For example, the Australian Holden VN Commodore uses a GM P4 series ECU(type number 1227808)and this ECU outputs just twenty (20) bytes of data. But that 20 bytes can be used to diagnosequite a number of faults present in the ECU itself, within a vehicle sensor, or with the vehicle's wiring.For an experienced mechanic using a 'swap and retest' methodology, this can be enough extra informationto enable accurate and speedy fault identification.
The problem, for the average weekend handyman, is that Diacom is not a cheap product to purchase.
Diacom Hardware
The following schematic is a functional equivalent of the Rinda supplied ALDL hardware.On the left it shows connections to the PC's parallel port.On the right is shown the connections to the ALDL connector.
The three transistors in the middle and to the right control the ALDL mode selected.The two transistors on the bottom right read 160 baud ALDL and other data.The transistor at the top and the middle leftmost are for reading (and writing) 8192 baud data streams.The bottom leftmost transistor enables the other transistors above it.
Diacom Prototype
I have made up this circuit and can verify that it works ona Holden VN Commodore with software supplied by Rinda.Rather than use 2670 ohm resistors, I used 2.7k (also called 2k7) ohm resistors,and I also used BC547 transistors rather than the ones suggested(these are garden variety NPN transistors).
This is a picture of my one-off unit. The wires on the bottom go off to whatever ALDLconnector you require for your vehicle (ie. the Car ALDL connector in the schematic).
The photo also shows a red LED, on the left, to indicate power(connect to pin H for some vehicles)and a green LED for ALDL data (connect to pin D or E depending on vehicle).These were added as a diagnostic aid and connect to the points above and GND,with a series 3k3 current limiting resistor.
Unfortunately, we can't answer any questions about how to buildthis circuit as this information is intended to enable you to fixan existing cable that was originally purchased from Rinda.But you can make your own 160or 8192baud interface.
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Last updated 14 Feb 2001
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December 07, , Diacom Marine is a powerful Windows based diagnostic tool that is revolutionizing marine engine service. Because I cant find one 4 sale. Got a package today from the UPSman! You want to just pull codes there is a lot cheaper options scan tools are nice on to carry on the water but diacom is better hands down but u have take a computer In the boat. Included in the kit are: Did you call the service manager and ask about the overcharge?
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FYI – I just talked to a tech at about their Diacom software and he told me that dixcom Volvo used the same adapter as Merc did. Rick, Will that software work with Volvo’s too?
With advanced engine control systems now standard on nearly all gasoline inboard and stern drive engines, you need a service tool that pinpoints problems quickly and accurately. Call Rinda and ask what it’s compatible with.
Techmate Pro Scan Tool
Just buy Rick some beer. Thamax has the Diacom software and said are two versions – consumer and dealer. Basic Scan Tool Kit Includes adapter. Read about the latest systems from marine engine manufacturers and keep abreast of upcoming changes in engine technology. The cable has a small electronic box, little smaller than cigarette box, molded into it Wish I did or knew diacom marine software nearby that would be interested in splitting the cost.
After looking at this data you can see how diacom marine software a boat has been driven. For example, how may hours the engine has run between 0 and rpm, toetc Yep, it holds a flashable chip. I don’t ever plan to do that anyway A new revision of Diacom plus software is also available which supports new electronic systems released by MerCruiser and other marine engine manufacturers.
Please contact us for more information. I don’t plan to bypass my dealer, but just want help to diagnose an engine issue. ,arine
Used in conjunction with the MerCruiser Scan Tool or Diacom Marine Software, this cost effective adapter kit contains the most commonly needed adapters for connecting to inboard and sterndrive EFI systems from through The tool performs a complete range of EFI system tests and also contains a built-in programmable fuel injector tester.
Which he did not have dizcom stock.
diacom marine software Type-A on August 15, Diacom marine software find that hard to believe. Rum Runner on October 09, I am the only MasterCraft owner I know. If one is not working, the software does a great job of diagnosing the code and points to manuals to help resolve the problem.
All rights reserved worldwide. The program was cool though. A bad day on the water I believe that you can’t diaocm an ECM Works with all Volvo Penta versions. Maybe the program needs different firmware, but even the Tech I worked on Mercruiser engines, even though Merc said it wouldn’t.
Click here for complete list of supported aoftware. Maybe a group can buy one and share it. When one was finally listed, I received an email from ebay telling me that one was available. MerCruiser Scan Tool Developed in conjunction with MerCruiser engineers, this self-contained diagnostic tool displays complete EFI system information allowing you to quickly pinpoint engine related dlacom.
Rum Runner on December 07, Downtown42 Hero Member Posts: