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Old 08-12-2012, 03:42 PM   #15
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Mike Went to Detroit Diesel Ocala on Friday after Alliance Coach replaced the HWH air level control box,all seems ok now. Regarding the Jake alarm check engine situation the DD computer did retain the VNT code again.which as I understand it it has something to do with the movement of vanes in the turbo.The tech was able to activate this action via computer and indicated it was operating properly.He stated that normally when this code is logged there are a number of others with it. He said however that this turbo action only takes place when jake is in high which it was not. They also said not to let the engine over rev past 2200. which it did not. I was concerned about the engine going into limp mode but he said the ddec5 will not do that.So no solution other than replacing the sensor which they didnt think was the problem.....
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Old 08-12-2012, 04:16 PM   #16
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Well I am glad that worked out. It is pretty hard to keep that motor below 2200 when that Jake comes on and it downshifts at the same time. I have found it easier on a 8% or greater grade to manually downshift to fourth gear and let the engine keep the speed down with momentary activation of the Jake. In fourth gear I can usually just keep the Jake on in LOW and let it roll. The worse situation is to not be paying attention in cruise control and have it freewheel going down hill then look at the speedometer and see that you are going above 70 mph. Now when you hit the Jake it comes on but no downshift and it does not slow down fast and requies you to hit the service brakes to get it below 68 mph then it will downshift but that engine is going up to 2500 rpm. I never get a CEL for that.
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