hello everyone. i have a 1997 gmc suburban 1500 4x4 with a 6.5l diesel. drove it today and right when i pulled in my drive way i put it in park and the truck died. now when i try to start it it wont start and the glow plug light wont come on.
anyone help please.

thank you in advance.
Sukhi

Does the lift pump make noise when you turn the key on? The glow plugs not working and no start?
Ignition maybe

A burned fuse?

If cold, cool, or warm, and not getting a WTS light, that seems to me like you've interrupted battery power at some point to the ECM. When I cut my battery master switch, and repower. I could crank all day it seems, because the glows won't power on that first try.

Burnt fuse, ignition switch issues (not the key switch either, there is a different one we are talking about here) Check also battery cables and engine ground. Battery cables are known bad spots. Engine ground located between passenger head and firewall (braided cable). Remove/clean/reinstall - good preventive measure even if not the main problem.

KOEO - Do you have an SES light?

KOEO - Key on engine off, (at least I think that's the translation) I'm still struggling with Lee's german thread . . .

thanx for all you help so far. no there is no SES light. i checked it out and the fuse for ECM-B was blown. its a 20a fuse. i replaced it truck ran for about 1 min then blew the fuse agin. it keeps doin this. the llast time i had a similar problem it was the PMD. i already have the PMD mounted on the fender with a heatsink on it. but when that happend it was the fuel solinoid fuse that kept on blowin. what and where should i check for this??
once again thanks for all your quick replies.

Under the dash wiring maybe, was there a command start in there at one point or another? Check for loose wires from the ignition shorting out. (my .02 cents)

Wiring harness going to PCM? These wires sometimes 'loose' their insulation and you might get an intermittant short ground from them.

Otherwise, what happens after about one minute? Something like the glow plugs switching to a lower power level because the cylinders have warmed up inside? Hm, maybe disconnect batteries, turn on headlights, replace fuse, turn off headlights, reconnect battery and then start to see what happens when starting with minimum glow plug usage?

yes there is a command start in there. i will cheack all the wires in the morning. after a min the truck just shuts off by itself.
i will let yall know what i find tomorrow.
thanx



Sukhi

I had the same problem a year ago. Couldn't keep a fuse in ECM-B Port.

Turned out to be the ECM itself...

I had the same problem a year ago. Couldn't keep a fuse in ECM-B Port.

Turned out to be the ECM itself...
Good excuse to upgrade):h

ok i checked the wires under the dash and under the hood. they look good. when i do start the truck it will run for a min and die. just the same fuse keeps blowin the ecm-b. so do you guys think it would be the ECM? also one very dumb question whjere is the ecm located? i looked under the dash and dont look like it is there.



Sukhi

ECM is in the glovebox, you'll have to remove the door on it to see the ECM located just above the heater motor duct work.

Try a 30a fuse ;)

My truck seems to react adversely to solar radiation caused by sun spots. It burnt out the turn signal fuse 4 times in 2 days and then it just fixed itself I guess.
Then it proceeded to burn the courtesy light fuse several times and that too healed itself in a couple days.
Curious, I checked the web, and found that on those particular days there were increased frequency of sunspots and solar flares and also a long delayed El Nino effect in our area.

Just kidding, well the last part anyway. Electrical gremlins can be a pain to track down, especially intermittent ones. I had this happen to a customers truck the day after we serviced it. He towed the truck in, pretty upset that we sold him a 'bad' injector pump. Took me about 2 minutes to figure out the problem, replaced his same ECMB fuse with a 25 or 30a and he's been gone for months. It has nothing to do with the pump BTW.

I'm not so sure about replacing with a higher amperage fuse...

Just to have a keen nose for smoke, tha's all . . .

i will try the 25a fuse. if that fails then i guess it i will replace the ECM.




Sukhi

becareful playing with the fuses if it is blowing the fuse there is a problem last thing you want it to wake up to a pile of ash in your drive way just my 2 cents

i replaced the ecm and got it flashed from the dealer. still have the same problem. :help: i dont know what to do now. it is at my friends shop right now and he is takin a look at it. i checked all the wires around the ecm and they all look good.
anyone know anything????





Sukhi

Unless I miss my guess, that fuse powers all the little things out and about on your engine. Things like solenoids etc. All's it takes is one chaffed wire, and Bam! You gotta kick your fuse up a notch. . . not really.

With your meter see what your resistance is to ground as it sits. If I remember correctly, you have a little while after your engine starts before it messes up. It could be somethings that the ECM is engaging, and then blowing your fuse.

yes it is a little while after the engine starts up that it will blow the fuse. do you know what comes one after the engine starts? i know it could be a number of things. could it maybe be the glow plug relay?
once again thanx for all your guys help so far.



Sukhi

There is just so much that the computer controls, it's hard to say even where to start. Try with the easiest way, of chasing the wiring around first, and see if you have anything that is chaffed. Then you may have to move up to see with unplugging compentents to see if one of them has fried, then blowing your fuse.

If it were the glow plug relay, I would think that you would not even get to the point where the engine would start. From cold engine (which sounds like you've had for a while) GP relay stays engaged for a while.

You may want to try for a brief time in the driveway a higher amperage fuse to see how long that lasts. If a 25 and 30 blow in the same amount of time, sounds like you've got a short somewhere, either in the component, or the wiring. I DON'T RECOMMEND THIS LONG TERM!

UPDATE:
i got a new ECM got it reflashed and installed it. still had the same problem. changed the fuse then truck was running good for about a week. rasn with no problems at all. now this morning started it up after about 5 min it shut off and the same thing agin. ECM-B fuse. now i have to spend my sunday trying to fix this thing. any one have any clue on what i shoudl check first?
thanx


Sukhi

Check all the wiring from the ECM to the IP, by hand. Especially on the firewall under the coolant overflow tank. I had a similair problem you could run an search on DieselPlace and find it as I was asking here for help. I replaced ECM twice, CPS, PMD twice, IP twice, all grounds, finally found a section of wires rubbed bare in bundle coming from ECM by firewall, that was shorting on the A/C line. I have to remove the wire loom and use mirrors to see them but once found and replaired not a hiccup since. Mine would start and run fine from cold (wires would lift slightly away from A/C line where they were grounding when hot) then as it heated after a couple of minutes it would sputter and stall, sometimes it ran for as much as a half hour before stalling but others just seconds. I took it to two dealer and two diesel shops but nobody could find the problem, although they thought they had hence all the replaced parts.

I never blew any ECM fuses but that could be just a difference of which wires were bare on mine.

Hope this helps, electrical gremlins are the worst. PM me if you need more specifics.