code 32,33 and 78?????????????????
 

hey guys,
anyone know if a 95 gmc 6.5 turbo diesel has a ecm? and if so where is it located?
every time one of these codes pop up. it shuts of the egr solenoids.

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now can the ecm be bad or the chip inside ecm be bad?or am i looking up the wrong area for these codes to be popping up?

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found the ecm in behind glove box.dont know how to get out .another question.took egr out .now i tried creating vacumme by sucking on it.should that plunger move freely? I know its spring loaded,i dont get any movement on it until i press on it then the vacumme works a little.

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:humm:there is a fairly new vac pump on the truck.But they are known to go.It does have vac.I just dont have a guage to read vac pressure.and I know pretty much with these three codes its all vac related or electrical trying to figure out what path to go.

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well broke down got a vac gauge.reading about 20 to 22 it bounces around a bit.now some how on the way home got a 29 code glow plug relay circuit fault .im about ready to beat this truck with a sledge patiance is wearing thin.i was told to use test light wire on pos of battery and put on the glow plug terminal should light up if good.well they are fine .if this is the rite way .also when turn key on normally you will hear a click along with buzzer.i usually wait for buzzer to stop and then i start it. there is no click after a few seconds .it will start but engine still warm.IS THERE A RELAY AND WHERE IS IT LOCATED?