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| Truck & Diesel Mechanic Forum - ASE Medium/Heavy Duty Truck Forum :: Forums :: Caterpillar | |||
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 ECM controls wastegate? why? |
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| Muffler Bearing |
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  Posts: 225 | Hey guys I'm a little behind the times. I just noticed that on my some of my newer C-10's the pressure line for the wastegate runs through a little coil operated spool valve. Now, all a valve would due is cut the pressure and keep the gate from opening, right? So can anyone tell me why the ECM wants to have control like this? Is this somehow pollution control? Thanks, Tim D. Technician A thinks Technician B is a moron. | ||
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| wcdiesel |
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  Posts: 227 | G,day Tim , It,s so the ecm can control turbo speed ( as in overspeed ) Regards David wcdiesel | ||
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| Muffler Bearing |
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Posts: 225 | OK so it's just for self preservation, If I have lost a turbo on that truck, I should test the function of that valve and make sure it can operate. Tah' David I owe you a XXXX! D. Technician A thinks Technician B is a moron. | ||
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| wcdiesel |
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Posts: 227 | If it fails it is usually fully open or closed - Regards David wcdiesel | ||
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| Oran |
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  Joined: Thu Dec 03 2009, 05:44PM Posts: 11 | The Wastegate control valve is controled by a pulse width signal from the ecm so it can moderate the signal pressure to the wastegate diaphram. I had one eat my lunch not to long ago. It came with the complaint of high exhaust temp. In a hard pull the exhaust temp would jump immediatly to 900 deg. and climb up to 1200 deg. I found the truck also was very low on power. I found that waste gate flap had broke off. I put a turbo on it and everything was great. A couple weeks later it went into a FTL dealer for same problem. They put a wastegate control valve on it and sent him on his way. He said he didnt get up to speed and same problem. He brought it back. I installed my Temp probe for my DVOM in the pyometer port and went for a test drive to verify it. Sure enough it was dead on with pyometer. But half way through a test drive I stopped and removed the wastegate signal line from the diaphram and it had pressure on it with the engine at idle. I recalled seeing a small orice at the bottom of the block the wastegate control valve is screwed into. When I got back to the shop I removed this block and found that the orifice that bleeds off this pressure was plugged up with what appeared to be melted o-ring. Cleaned this orifice out and problem solved. No where in the manual,other than in a picture of the circuit,is this orifice mentioned. "Strive to be a better technician,not a better mechanic" | ||
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| proffesor |
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Posts: 56 | Oran, Now that's good techin, that could've been passed around for a while if not for your persistence . ss | ||
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| Moderators: Master Mechanic, popskull, Muffler Bearing, irishniners, hdtrktch, wcdiesel, proffesor |
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