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  #1  
Old 01-24-2011, 11:07 AM
frosty frosty is offline
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Boat: 1998 Maristar 225 LT-1 (the SS Overkill)
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Question Location of OBDII port on LT-1?

Hello all,

I finally got a scan tool, and cannot find the OBDII port to plug it in to!

1998 LT-1 330hp in a 1998 Maristar 225.

Nothing wrong with engine, just want to play with the scan tool.

Does anyone know where the port is located?

Have been pulling all the connectors on the engine I could find, and I could not find one that fits the OBDII dongle.

Thanks!

David
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Old 01-24-2011, 01:09 PM
gotta_ski gotta_ski is offline
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Boat: 1998 Prostar 190 LT-1
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From what I've read and from looking over my own 98' LT-1, I don't think it has an OBD II port. I believe our motors use MEFI, Marine Electronic Fuel Injection, which has a different plug. I'm not sure if MEFI is a GM creation or an Indmar creation for that matter.
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  #3  
Old 01-24-2011, 01:11 PM
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flipper flipper is offline
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Boat: 1991 Prostar 190, fuel injected 302
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There is no OBDII plug on it.
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Lots of power is good, more is better, too much is just right.

'91 prostar 190
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  #4  
Old 01-24-2011, 07:24 PM
FrankSchwab FrankSchwab is online now
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I had the same plan when I got my boat, frosty. And I got the same answers - there's a port, but it's not an OBD-II port.
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1998 Maristar 200VRS
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  #5  
Old 01-24-2011, 08:23 PM
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Table Rocker Table Rocker is offline
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There are some MEFI systems that aren't too outrageous in price.

http://www.obd2allinone.com/mefiscan.asp

Last edited by Table Rocker; 07-17-2014 at 08:25 PM.
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Old 01-24-2011, 08:38 PM
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ahhudgins ahhudgins is offline
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Quote:
Originally Posted by Table Rocker View Post
There are some MEFI systems that aren't too outrageous in price.

http://www.obd2allinone.com/sc/detai...item=mefiscan1

I'm glad you posted that link. I bought one of the code readers for my 95 MEFI just to read a code if one ever comes up and I modified it to install a "check engine" led on my dash. I've been bidding on some scan tools that show up on ebay from time to time but this looks more like what I'm looking for at a cheaper price. I just want to know what my ECM shows as the engine temperature.
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  #7  
Old 01-24-2011, 09:29 PM
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JimN JimN is online now
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Please delete. Thank you.

Last edited by JimN; 01-24-2011 at 09:32 PM.
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  #8  
Old 01-24-2011, 09:30 PM
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JimN JimN is online now
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It's not OBD II, it's OBD I and the '98 used the MEFI 2 controller, possibly CEFI 3.
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  #9  
Old 01-24-2011, 10:08 PM
frosty frosty is offline
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Boat: 1998 Maristar 225 LT-1 (the SS Overkill)
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Thanks for the replies, guys.

So, if I get this correctly, I can either purchase the CodeMate code reader for $39 (http://www.rinda.com/marine/marine.htm#merctool), and read the LED flashes to get the MEFI error code (but not know the exact component that triggered the code),
or spring for the USB -> MEFI cable for $195 (http://www.obd2allinone.com/sc/detai...item=mefiscan1) and use the free software (http://www.tunerpro.net/downloadApp.htm) to read the error codes, and much more.

Am I missing anything?

It doesn't look possible to build your own MEFI cable, must be some circuitry involved.

Thanks for the education!
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Old 01-24-2011, 10:52 PM
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JimN JimN is online now
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Quote:
Originally Posted by frosty View Post
Thanks for the replies, guys.

So, if I get this correctly, I can either purchase the CodeMate code reader for $39 (http://www.rinda.com/marine/marine.htm#merctool), and read the LED flashes to get the MEFI error code (but not know the exact component that triggered the code),
or spring for the USB -> MEFI cable for $195 (http://www.obd2allinone.com/sc/detai...item=mefiscan1) and use the free software (http://www.tunerpro.net/downloadApp.htm) to read the error codes, and much more.

Am I missing anything?

It doesn't look possible to build your own MEFI cable, must be some circuitry involved.

Thanks for the education!
The codes tell which sensor is reading the information. It's not an elaborate system- each sensor that can cause a code will either report higher or lower voltage than normal. The knock sensor either hears knock or nothing- either will cause a code to be stored. The IC (Ignition Control) Module will also cause codes to be stored. The codes have been posted here several times and they're the same ones GM has used for decades.

To read the codes on the MIL (Malfunction Indicator Lamp), you need to connect terminals A and B on the DLC (Data Link Connector), which is sometimes called the ALDL (Assembly Line Data Link). If you don't use the MIL, you can use a test light on two of the other DLC terminals. You won't see actual voltages or percentages with a scan tool.

I wouldn't recommend changing any of the values in the calibration program, if the software allows it. Changing the tuning can result in catastrophic failure if you try to guess.
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