logo cart

OBD2 Scan Tools
GM OBD1 Cables
MEFI Scan & Tune
arrowStandard Edition
arrowProfessional Edition
arrowCompare Versions
arrowMEFIburn Info
arrowTuning Services
arrowMEFI Controllers
MEFI Scan 1-4
MEFI 5 Tune
MEFI 5/6 Scan
555 Scan
Slingshot Scan
Slingshot Tune
Marine ECMs
Merc 555 ECMs
ECM Repair
Ramjet Tuning
Custom MEFI Tuning
Vehicle Connectors
J1939 Solutions
Extender Cables
Custom Cables

arrowShipping Info
arrowDiagnostic Software
arrowInstruction Sheets
arrowHow To Use Video
arrowELM327 Data Sheet
arrowWarranty / Returns
arrowContact Us
arrowOBD2 Links & Info
arrowInternet Forums
arrowOur Competitors
arrowBeyond Scanning
arrowParts & Accessories


spacer MEFI Scan & Tune

Standard Edition
Professional Edition
Compare Versions

The Complete MEFI ECM Solution - Tuning, Data Logging, Diagnostics for MEFI1, MEFI2, MEFI3, MEFI4, 4A, 4B

Our Marine EFI (MEFI) Scan & TuneTM system allows you to download the internal MEFI programming to your PC or laptop with our MEFIburnTM program, change the operating parameters of the controller, and then reprogram the controller with your modifications. It also allows you to view all of your sensor systems in real time and log the data for later viewing, in addition to seeing which malfunction trouble codes, MALF's, have been set. Some competing systems will only allow you to monitor the performance of your boat or off-road vehicle's engine controller and reset engine trouble codes. Other costly packages force you to use an inconvenient hardware dongle or key, and only work with a few versions of the MEFI ECM series. Those days are over!

mefi ecm

Since 1992 the GM Delphi MEFI ECM Controllers have been used in a wide variety of applications, including:
  • Marine - MerCruiser, Volvo Penta, Crusader, Indmar, many boating applications
  • Off-Road - Sand rails, race cars, industrial engines, and more
  • Crate Engines - Ramjet 502, Ramjet 350, LT1, LS1, LS2, LS6, LS7, Ecotec
The MEFIburn Scan & TuneTM package comes complete with everything you will need to interface to generations of the MEFI controllers, including MEFI-1, MEFI-2, MEFI-3, MEFI-4, MEFI-4A, MEFI-4B:
  • A USB - MEFI Interface Cable. This has the 10-pin Delphi MEFI connector on one end and plugs into your computer's USB port on the other end. All of the electronics are contained within the cable itself. The cable is about 3m (10 ft) long, giving you plenty of distance between your engine and where you will be placing your laptop. 6-foot and 15-foot USB extender cables are available
  • A CD-ROM containing all the software you need to do both monitoring and tuning of your controller.
  • A Step-By-Step set of instructions that will show you how to get up and running quickly.

The following table will help you determine which MEFI controller you have. On the bottom of the controller is a sticker with a part number. The GM part numbers and MEFI ECM's are listed here:

GM Part No. MEFI Type
16159919 MEFI-1
16189069 MEFI-1
16220371 MEFI-1
16234539 MEFI-1*
16210729 MEFI-2
16237009 MEFI-3
16237019 CEFI-3
16236999 MEFI-3*
12489488 MEFI-3
12489493 MEFI-3
12569494 MEFI-4
12575479 MEFI-4a
88962717 MEFI-4a
88962718 MEFI-4a
12584052 MEFI-4b
12597744 MEFI-5
12607802 MEFI-5a
MEFI 1 and MEFI 2 packaging

MEFI 3 and MEFI 4 packaging

*Used by MerCruiser
For scanning the MEFI 5 and MEFI 6 ecm's, see MEFI 5 Scan and MEFI 6 Scan

Monitor your MEFI 1, MEFI 2, MEFI 3,
MEFI 4,MEFI 4A, MEFI 4B system

Scanner Pro is used for doing engine monitoring, data logging, and malfunction trouble code reading. We have developed MEFI 1, MEFI 2, MEFI 3, and MEFI 4 definition files that allow you to take full advantage of the features that Scanner Pro has to offer.

Our custom-designed interface cable allows you to do real-time monitoring and data logging of the MEFI engine controller.

MEFI Scan & TuneTM supports the following controllers:

MEFI Type Supported

We now have MEFI5 and MEFI6 scanning and Polaris Slingshot scanning, see:
MEFI 5 Scan and MEFI 6 Scan and Polaris Slingshot Scan

mefi ecm

Download and Burn

A critical step in the tuning process is the ability to upload and download programs between your MEFI controller and your PC or laptop. We have developed custom software, the MEFIburnTM program, specifically designed for MEFI controllers to do that data transfer. This MEFIburnTM software can do both the download and critical upload (programming) functions. It works with the common automotive .bin file format, the Motorola S-record .ptp file format, as well as the Ingenius Pro .cal, .asm, and .umi file formats. The MEFIburnTM program has the capability to convert files between all 5 formats, so regardless of the calibration or tuning file type you have, you can use it.

The MEFIburnTM program allows you to enter a password on password protected calibrations, if you know the password, or if you do not know the password, completely blank out the internal memory of the MEFI controller and upload a fresh base tune to start your custom tuning process. For complete details and screen shots, see our MEFIburnTM page

Click for MEFIburnTM screenshots and detailed program info.

Tune Your MEFI Controller

TunerPro is a free, donate-if-you-like-it tuning platform aimed at making tuning easier and cheaper. TunerPro started life as GMECM Edit, and debuted in early March of 2003. TunerPro has since grown into a very robust tuning tool.

We have developed two versions of control definitions to work with TunerPro, the Standard Edition and the Professional Edition. There are hundreds of parameters that can be tuned in a MEFI controller, however, only a handful are typically used. We have selected this typical parameter set for the MEFI Scan and Tune Standard Edition. The full parameter set is overwhelming for all but professional tuning applications, so for those pro users, we have MEFI Scan & TuneTM Professional Edition. For complete details and screen shots of TunerPro, see our TunerPro page and Mark Mansur's TunerPro.net webpage

Click for TunerPro screenshots and detailed program info.

Monitor and Data Log Your MEFI Controller

ScannerPro is a free, donate-if-you-like-it monitoring platform also done by Mark Mansur. Mark has done a great job of creating a simple to use and very detailed monitoring and data logging framework

We have developed 4 versions of control definitions to work with ScannerPro, MEFI-1, MEFI-2, MEFI-3, and MEFI-4. There are many parameters, flags, warnings, and MALF trouble codes to be monitored and logged for each generation of the MEFI ECM. For complete details and screen shots of ScannerPro, see our ScannerPro page and Mark Mansur's ScannerPro.net webpage

Click for ScannerPro screenshots and detailed program info.

Ramjet 350 and Ramjet 502 Reprogramming

We have the capability to reprogram the calibration and tune of your Ram Jet 350 or Ram Jet 502 MEFI ECM. We do this Ramjet tuning on a mail in basis, and charge $300 for basic tuning. Don't suffer with a poor running Ramjet any longer!

Custom MEFI tuning

We can custom tune your MEFI controller, program your ecm remotely, anywhere in the world, and do MEFI Calibration Translation. See our custom and remote tuning page.

Compare features, price, & MEFI types covered:

Ingenius Pro - http://www.azspeed.com/inmaso.html
MSD Fuel Injection - http://www.msdfuelinjection.com/
Rinda Technologies - http://www.rinda.com/marine/marine.htm

Interesting MEFI links:

Wiring Harnesses & MEFI's - http://www.efiharness.com
GM MEFI - http://www.gm.com/automotive/gmpowertrain/engines/
GM MEFI-4B - http://www.gm.com/automotive/gmpowertrain/engines/
GM Technical Services - http://www.technicalservicesin.com/
TunerPro - http://www.tunerpro.net
ScannerPro - http://www.scannerpro.net

Others Experiences, Internet Forums:

Offshoreonly.com - http://www.offshoreonly.com/forums/
Speedwake.com - http://www.speedwake.com/
Iboats.com - http://forums.iboats.com/
Screamandfly.com - http://forums.screamandfly.com/
Performance Boats - http://www.performanceboats.com/html/forums/
MarineEngine.com - http://www.marineengine.com/
Boatered.com - http://www.boatered.com/forum/

MEFI usage and applications:

General Motors in Kokomo Indiana, formerly Delphi Delco Electronics, manufacturers the finest engine controllers in the world, and their development, testing, and manufacturing capabilities are unrivaled. The MEFI line of controllers has evolved over the years and always has been on the cutting edge of engine control technology. The MEFI has been deployed in myriad applications from marine to industrial to racing to crate engine packages. This controller has enormous flexibility and the number of internal engine control parameters is staggering. To date, this marine ECM controller has faced challenges for custom deployments and modification because of the lack of a competitively priced and widely deployable software and hardware solution. Now, the only question is if you want the Standard or Professional version of the MEFIburnTM package.

Call Toll Free (USA Only) 888-469-3274

OBD2 | GM OBD1 | Marine ECMs | MEFIburn | J1939 | Ramjet

OBD Diagnostics, Inc., Redondo Beach, CA 90278
Tel: 310-793-2410     Email: sales@obd2allinone.com
Terms and Conditions     Privacy Policy