Shaunied_92 Posted January 7, 2021 Share Posted January 7, 2021 Morning all I have a 2007 Mack trident 470 ccrs ea7 keeps throwing code 4-5 turbo actuator I have tested the actuator and there is nothing visually wrong with it and no air leaking out of the diaphram Cannot find any other boost leaks or rubbed through hoses I am thinking it may be the 2 sensors in the intake manifold one at top front one at rear behind computer any help or pointers appreciated note engine photos is not my engine. Just as a guide as I’ve been told there is a few different ones Quote Link to comment Share on other sites More sharing options...
Mackpro Posted January 7, 2021 Share Posted January 7, 2021 Mack has a good bulletin on the 4-5 code on the CCRS 460 engine. Only the higher HP levels CCRS engines used the wastegated turbos. Not to be confused with the ASET 4-5 code with the VGT turbos . On the CCRS 460 , in the engine software there is derate for overboosting and if the boost is to low then of course you have low power. So the wastegate adjustment has to be set up perfect. I’ll see if I can find the bulletin Quote Link to comment Share on other sites More sharing options...
Mackpro Posted January 7, 2021 Share Posted January 7, 2021 https://www.bigmacktrucks.com/topic/29716-low-boost-wastegate-error-code-can-anyone-help/ Quote Link to comment Share on other sites More sharing options...
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