dpacella

I have a 2007 Mack Aset AC427 engine I'm having issues with. I'm using Mack's PTT software that is installed on my laptop. I have blink code 4-5 (low voltage) popping up (VGT position sensor) and also it wont allow me to calibrate the turbo either. It says "Value outside permitted range" when trying to calibrate. I went into my MacK Diagnostic manual and followed all the different steps for the blink code 4-5. I went to the require pins and check ohms and voltage, I'm getting .01 volts off the harness going to the position sensor connector and also off the ECM pin that goes to the VGT position sensor. I cleaned the grounds on the main engine harness. I have two different ECM's laying around that I swap in and out . I used a different VGT control valve. Just now I replaced the complete engine harness and the blink code 4-5 is still coming up. I have two VGT position sensors laying around that I tried as well. I verified that air is coming out of the VGT control valve and ran air through the steel air line too, but I didn't gauge the air coming out of VGT control valve going to the VGT actuator. I have no major air leaks, I do have the ATC & ABS light intermitting coming on. I used Macks' PTT software, Mack's shop manual and my imagination. I'm not sure what else to try besides it might be the actuator on the turbo? If anyone can point me in the right direction I would appreciate it, thank you.

Here is a Aset engine EGR delete kit https://otrperformance.com/product/mack-aset-ac-egr-performance/?gclid=COyxzuS2kdQCFVGAaQodRUsCgg

Check out this EGR delete kit for the Aset engines https://otrperformance.com/product/mack-aset-ac-egr-performance/?gclid=COyxzuS2kdQCFVGAaQodRUsCgg

On Mack Aset A/C engines. There is a hose that transitions from the intake manifold to the EGR mass flow pipe that goes over the top of the engine. Put a hose clamp around the center of (transition hose), then start tightening the hose clamp over the (transition hose) and make the diameter of the (transition hole) smaller. The two sensors that are welded on the flow pipe don't measure volume of air, but instead the two flow sensors needs to see fluxiating air flow. That why just adding resistor won't work to trick the flow sensors. By making the (transition hose) a smaller diameter, your restricting 90% air flow going to the EGR valve and forcing more to the intake manifold. When you want to undo it, just loosen the hose clamp on the (transition hose) to put it back to stock.

I have a 2007 Aset AC427 engine. I have codes for VGT positioning sensor and Engine speed sensor. I follow the instructions on my V-mac III service manual. Both sensors checked out fine and the continuedy test was good with both harnesses. But pin 26 off the J2 of the ECM was no where near 4.9-5v for vgt positioning sensor. There is 12v going to the ECM I swapped out the ECM with another one, same results. Im thinking it might be a grounding issue? If anyone can point me in the right direction, I would really apperciate it. thank you

I have a 2005 Mack with Aset AC355/380. I put a plate in between the exhaust manifold and EGR. Now I notice that the check engine light (EGR fault 146-7) comes on, I can feel the engine de-rate, but as soon as the check engine light goes off the power is back. The check engine light comes on maybe once or twice a day. So I was reading about how to add resistors to the flow sensors to trick the ECM into thinking that the flow sensors are working properly. I cut the two flow sensor harnesses that go into the firewall side of the ECM and installed two separate 270 ohms 1/2 watt resistors After installation of the resistors a check engine light came on and gave a fault code 21-5? Now I'm guessing because code 21-5 is not it the fault code book. I looked up code 21 its the engine position sensor and code 5 was current low/open??? I am stumped at the moment and was wondering if someone can shed some light on my issue.