2006 Mack aset turbo actuator

[Jeffrey 34]

Hello,does the turbo actuator on a 2006 Mack aset supposed to cycle when you turn the key to on position or does it have to have a certain amount of air pressure to cycle,mine is not moving when I turn the key on.

[fjh]

yes it is suppose to ! but the truck has to have at least 90 to work properly ! Also you should observe if its going full stroke on the test cycle!

[Jeffrey 34]

Yeah mine is not cycling when you turn key on with good air pressure,there is no air coming out of air line to actuator until you crank engine

[Joey Mack]

Ok...  There is a small brass knob on the treadle valve assembly. Has someone shut it off? If its on, look straight down for the VGT air filter. Its a spin on, small like a mower oil filter. Remove the filter and see if air goes through it, there are small air lines that need to be checked down there.  You should see 1/4" lines running straight down the center of the left side of the engine. There is also a celenoid with the filter.  Start simple first by getting air to come out of the line at the turbo. With the key on. Hook an air pump to the truck to keep pressure up.

[Jeffrey 34]

Joey Mack I’ve taken little filter off and has good air coming out and check all lines going to it ,that celenoid with filter that the small line runs to can you clean it out or not

[Joey Mack]

I never tried to but , why not try it.  Im glad you are familiar with the VGT filter. So with the key on and air above 90, you dont get air leaving the celenoid? 

[Jeffrey 34]

Joey Mack no air at all until you crank the engine then you have plenty coming out,don’t know if I need to try and mess with that celenoid filter or not that’s a hunk of gold,the truck runs fine just has no boost when you starting from a dead stop.

[Joey Mack]

I assume you cleared the line to the turbo ?  That braided line can break apart internally and block the flow

[Jeffrey 34]

Joey Mack,yes line is clear , don’t want to have to buy that celenoid but I don’t see what else it could be I mean that’s what controls the turbo actuator 

[Joey Mack]

Its looking like the celenoid. How do the wires look to the brain for it ? Its behind the EECU. If i remember right.. 

[Jeffrey 34]

Joey Mack the wires look good I guess I’ll get the celenoid for it,that might be why it’s so sluggish and no boost when I’m taking off loaded.

[Joey Mack]

Sorry bud.  Its almost like throwing high dollar parts at it but without a code reader, and based in the steps you have taken, it may be correct. Did you check the VGT actuator for free movement ? The pin in the yoke can seize.. just remove it and buff it clean, reinstall with anti sieze..  

[Jeffrey 34]

Joey Mack when you crank the truck up it opens all the way up it just don’t move when you switch the key to on position 

[Joey Mack]

Hmm.  Programming issue ?  I assume its dumping boost when you need it.  

[fjh]

2 hours ago, Jeffrey 34 said:

Joey Mack when you crank the truck up it opens all the way up it just don’t move when you switch the key to on position 

Do you have access to compressed air ? Take the line off the actuator and see if you can make it move! As Joey said the pin can seaze on the actuator! Is there any air coming from the stainless line going to the actuator? Sorry I’ve been away since posting this morning! Every start the computer does a sweep check! If it’s not doing that the engine won’t know where to start from!