Hello all, Have a Cat 972K wheel loader S/N- LZ4W00267 that is throwing a code for EGR balance valve, current low. Was sent a picture of the dash error by the customer and am heading out in the morning to check it out. I don't do a lot with Cat equipment in particular but do have cat ET. From what I understand, this code is actually for a pressure regulating solenoid that controls turbocharger boost? If this is correct, I am looking for more info on where this solenoid is and the test procedures for it. Thanks for for any info, JB
Can you post that photo to see what the Code is.?
This is all he sent me
Unfortunately he has cropped the photo on the LH side. In the top LH corner will be a number in the format xxxx-xx that is the key to the Code. I think it might be 3409-05 but not 100% sure. If it is then the attached procedure is the recommended troubleshooting. It appears as though Cat ET will be required. In addition to the troubleshooting you will probably also need a complete electrical schematic for the machine. Do you have one.?
I gotcha, I will see if he can sent the complete picture before I head out there. I do not have an electrical schematic for it, my Texa unit may if I hook that into it. If you had one available that would be great.
He sent me the code and it is in fact the 3409-5. I will dig into it and see what I can find. Thank you
Check your message inbox for a schematic. From what I can see the Cat ET is used to run various tests as part of the troubleshooting procedure. I'm not sure if your Texa scanner can do that.
I got the schematic you sent. I have both Cat ET and texa so I should be good. I'll let you know what I find out. Thanks
Well it turned out to be any easy fix. Somone had previously replaced the balance valve and broke the lock tab off the cennector. When I went to backprobe the connector, it pushed apart. After repairing the connector, all is good. Thanks again.
With luck like that you should be buying a lottery ticket........
If only it was always that easy haha. I did see it had an active code of a 1-7 Cylinder #1 Injector not responding properly. So will be digging into that next. Still seems to be in dreate