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Go Back   Dodge Cummins Diesel Forum > 1st Gen. Dodge Cummins 89-93 12V Forums > 89-93 Powertrain
89-93 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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Old 09-04-2011, 09:24 PM   #1 (permalink)
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can you bypass ECM

I have a 93 D250, is there anyway to bypass ECM compleatly, my ALT is not charging, OD not working as it should, speedometer is reading 7MI slow and the motor is smoking bad on startup, a rebuilt ECM is $199 if I can get one, Autozone and O'RiLeys can't get one, their on back order. I just hate computers anyway, I say keep it simple and you'll have less problems, any help out there?? I mean its only got 372,000 miles on her, she's not even broke in yet, but this is the 3rd ECM gone bad, thanks Wayne
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Old 09-04-2011, 09:41 PM   #2 (permalink)
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You sure can it's easy if it's a 5 spd. Speedometer I use a Garmin has a speed and trip miles so you can keep track of your miles. Charging problem use a external regulator or a 1 wire alternator. Grid heaters use a push button to energize the grid solenoids. If it smokes bad on start up could be time for new injectors. If you have a auto trans someone should be able to help you on bypassing it.
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Old 09-04-2011, 09:51 PM   #3 (permalink)
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thanks for the quick repley, Its a auto trans, yes I can use a 1 wire alt or put in a voltage regulator from a older model, any hints on how to wire a older regulator in??and I do have a garmen, that's how I know the speedo is 7 miles off, is that all the ECM runs is ALT, OD and starting, it never smoked untill the ECM went bad, does the ECM control the TPS also??? it must!
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Old 09-04-2011, 10:03 PM   #4 (permalink)
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If you use the google box at the top left of the page and put in external regulator you will find a lot of threads on this also there is a tech section that I believe has some assistance on wiring one in. The ECM tells the grid heaters when to come on I can help you with a push button for that. I believe there is a way to bypass the Trans but I don't know anything about it. Try unplugging your KSB to see if it still smokes when you start it.
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92 D250 custom made bed, 190 inj., 16cm , electric cooling fan, 2nd gen air horn, 5spd., Dana 61 3.31 gears, 1 stage W/M set up

97 2500 4X4 auto DDP 40 HP injectors, no 8 fuel plate, homemade 3" intake horn, BD converter, BHAF, electric cooling fan
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Old 09-04-2011, 10:11 PM   #5 (permalink)
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Chrysler Dodge & Jeep Alternator ECU External Voltage Regulator Bypass this place has a kit for your regulator. From I have read in other threads don't buy a cheap regulator.
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92 D250 custom made bed, 190 inj., 16cm , electric cooling fan, 2nd gen air horn, 5spd., Dana 61 3.31 gears, 1 stage W/M set up

97 2500 4X4 auto DDP 40 HP injectors, no 8 fuel plate, homemade 3" intake horn, BD converter, BHAF, electric cooling fan
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Old 09-04-2011, 10:29 PM   #6 (permalink)
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thanks OLDRAM that's just what I was looking for, I just ordered one, good going mate, Wayne
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Old 09-04-2011, 10:32 PM   #7 (permalink)
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I never have to use the grid heaters here in FL, so their no problem, I even have a remote start hooked up and she just fires off every time.
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Old 11-15-2013, 02:46 AM   #8 (permalink)
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If u eliminate the PCM wouldn't that mess ur water in fuel light and most of the gauges on the dash. Or is there a way to wire it in so all u gauges still work
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Old 11-15-2013, 08:43 AM   #9 (permalink)
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im not sure but the tps delete might help you with your o/d problem. i think its dnr customs that sell them there like $40. i installed one on my truck and it fixed my o/d issues. im just not sure how it works with the ecm.
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Old 11-15-2013, 09:39 AM   #10 (permalink)
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I drove with my computer blown and all my gauges worked. These trucks are simple enough that they don't really need the computer for everything to function. I don't know about the water in fuel. That's just because I've never had water in my fuel
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Old 11-15-2013, 02:27 PM   #11 (permalink)
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The 92 and 93's you'll loose the internal regulator and i believe the speedometer and any functions controlled by the CPS. The gridheaters won't work but you can put them on a push button.
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92 D250 custom made bed, 190 inj., 16cm , electric cooling fan, 2nd gen air horn, 5spd., Dana 61 3.31 gears, 1 stage W/M set up

97 2500 4X4 auto DDP 40 HP injectors, no 8 fuel plate, homemade 3" intake horn, BD converter, BHAF, electric cooling fan
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Old 11-15-2013, 03:29 PM   #12 (permalink)
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Yeah I had to run a regulator but I didn't lose my speedo. I did lose cruise control and the grid heater.
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The Roo Hunter- 93 dodge ram w250 g360, np205, 4" lift, custom 3/8" bumper, ddp stg 3's and pin, steed speed, IISB s362, DE 4" straight pipe. Getting p pumped
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