irat83
Need a Spot
Reged: 08/06/09
Posts: 10
Loc: Vermont
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Hey there fellas grate forum, maybe one you you can help me out. I have just finished dropping a 83 4D55 Turbo Diesel into a 89 dodge power ram 50 sports cab and after the wiring nightmare which included cutting the super fast glow plug system including the two relays, drop resister ,fuel heater control module and the Diesel control module or (BRAIN) out of the 83 loom and splicing it into the 89 gas loom Im having a few problems, go figure . When I turn the key to activate the glow system the second relay clicks closed ,thats gives me (slow glow) that glows @ 6V for 30 or so seconds but my problem is that the first relay dose not click closed to give me the 12V for 4-6 seconds like its suppose to and that need for the engine to start up hear in the cold north east . After testing the first relay and finding it to work and messing with the wiring for a bit I released that the brain was not sending power to the relay for it to click on . I then unplugged the coolant temp sensor thinking that maybe it was acting up and tried again with the same result. sense I dont have another brain to plug in and try it out, I was wondering if some one out there could test their's and tell me the results .
From the diesel control module there are two thin green wires with black stripes (on the 83 at least) each one goes to a relay under the hood , when you turn the key they both should click on one for 4-6 seconds giving a 12V burst to the plugs and the other ( the after glow ) should stay on for 30 seconds supplying 6V . please some one out there give me a reference point. I tried a toggle switch instead of the relay but even just holding it on for short bursts 6 seconds or less I have blown two sets of plugs and thats not cheep. any Ideas Thanks -Irat
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Rayman
Getting the Wheeling Fever
Reged: 11/29/06
Posts: 59
Loc: Orygun USA
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Irat,
I've had this happen on two D50 4D55's. The cause of the
non working 12V start up is usually a blown FET in the control module. If you are still blowing glow plugs after
a toggle bypass then I suspect one or more of your glow plugs is not working. Go to the factory service
manual where there is the check out procedure. They all need to be of the right operating resistance or they will blow as they are hooked up in parallel. Check to make sure all 4 glow plugs have a good ground and have a good power connection. If any of them don't you will have less than the right resistance to ground and the plugs will blow.
I hate to say it but you are better off starting with a
whole new set of 4 since one of the plugs may be intermittently open when heating.
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Ray
In the Pacific Wonderland
95 Montero 5 spd
87 Raider 2.6 5 spd
65 MG Midget
2002 Integra GSR (wife's car)
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irat83
Need a Spot
Reged: 08/06/09
Posts: 10
Loc: Vermont
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Rayman,
Thanks for the input. Have you ever had luck at replacing/repairing the FET in the control module or did you bypass with a toggle? I put a new set of 4 in the engine today, but I want to fix the control module or replace it. Have you had any luck finding the Diesel control modules for sale online?
Thanks again,
Irat
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Mikewarme
Getting the Wheeling Fever
Reged: 05/06/07
Posts: 90
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OK. You've done great so far. However, every 83 glow controller does what yours is doing. Water leaks in at the windshield and shorts it out. Mine behaves the same way. Wire the 12volt to a push button so you hold it for a few seconds only. If you are tuned right it should start right up every time. Check your pump timing. Mine starts in practially 2 revloutions. The 83 starters sucked also. I used a 84 starter and it turns faster. They have more torque. Those modules are discontinued by Mitsu. Nobody can fix them or wants too. UNLESS someone here from a diffrent area has a source of a rebuilder for the glow controllers? Part number MD016354 for the 83.
Mike
818 268 3012
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PHIL
Mitsubishi Section Editor and Moderator
Reged: 01/09/00
Posts: 7145
Loc: Airdrie, Alberta
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Can't add anything to this discussion as I've only had the 4D56 and later, but thanks for the info guys. Sounds like he's in good hands.
As an aside, many of the gas mitsu starters cross over to other gas engine applications... might be an avenue worth pursuing to cannibalize a gas starter for the diesels too? Goodness knows between me and my buds we've taken apart many gasser starters, from talons/lasers, to 2.6s, to 3.0V6 starters...
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93 Pajero 2800 turbo diesel: "Ol'Betsy #5"
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irat83
Need a Spot
Reged: 08/06/09
Posts: 10
Loc: Vermont
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OK, But what about the other relay? Did you even bother with it? I have discovered that my second relay is also doing something weird; I turn the key and it fires on, but if I monitor the volts leaving the drop resistor or at the busbar the following happens: It clicks closed and the volts start off at 1.3-1.7V and slowly climb until around 4.7-4.9v and then the relay clicks off. This takes about 12 seconds. According to the diagnostic write up I have it is supposed to give a constant 6V for 30 seconds unless the coolant is above 86F. Before measuring the volts I just assumed it was giving the proper 6V.-Irat
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Rayman
Getting the Wheeling Fever
Reged: 11/29/06
Posts: 59
Loc: Orygun USA
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Irat,
The two relays are the same so try switching relays.
12V for 6V since the logic seems to be working on the six
volt and install the toggle switch bypass as Mikewarme
suggested. Check your drop down resistor for cracks and
resistance. That maybe the whole problem. Make sure the contacts are clean. Keep us informed. You can fix the
FET and they always fail. The bypass is the most effective
solution.
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Ray
In the Pacific Wonderland
95 Montero 5 spd
87 Raider 2.6 5 spd
65 MG Midget
2002 Integra GSR (wife's car)
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Mikewarme
Getting the Wheeling Fever
Reged: 05/06/07
Posts: 90
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It has nothing to do with the relay. Thats the nature of the dropping resistor. Thats plenty of power if the coolant is warm. No luck with new units. I figured out that the 84 model has the same connector as the 83 for the module. It is a 12 v setup however so new plugs and new 84 controller for me. Have to get the control from Japan. Mitsu wont sell it here . Part # MD112305
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spencevans
Mudrunner
Reged: 03/14/08
Posts: 345
Loc: Utah
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I got a new glow control module in the mail today. It is part #MD112305. I had to order it from Japan. Like Warme said, the dealers here in the states will not order these control modules for you.
It appears to have been made in October of 2000, so I think they have stop producing these modules, so supplies are limited. It only set me back about $500 and I am happy to have it. I may order another as a backup before they become obsolete. I am going to careful not to mount this one on the kick panel where it can get wet.
Just upgrade to the new control module and the 12 Volt glow plugs and you should be good to go.
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Spence
1985 Mitsubishi Pickup, 2.3 Turbo Diesel, 13" lift, Watercooled turbo, 4D56 Head, Atlas II 5.0 Tcase, Dana 44's,Fox 14" Coilovers, Elockers, 33x12.50x17 General Grabber Competitions.
2003 G-class
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Rayman
Getting the Wheeling Fever
Reged: 11/29/06
Posts: 59
Loc: Orygun USA
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The manual switch conversion costs $12. You either must be
showing this truck or trying to keep original. (with non
original parts). $500 is one third the going price for D50
diesel in these parts.
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Ray
In the Pacific Wonderland
95 Montero 5 spd
87 Raider 2.6 5 spd
65 MG Midget
2002 Integra GSR (wife's car)
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