CHeck this out. https://ia801005.us.archive.org/11/i...ic%20Drive.pdf




Around page 20, some conversations about VA/RA values....im guessing FS=Fail Safe?


you probably need something other than Carly. Lke ISTA, etc.


But even with that, it feels like you can replace a ton of parts on this code. Not a lot of resolutions in any forums. Valve block and sensors?


How DOES the system evaluate the VA and RA items? If it is a signal from a pressure sensor, THAT sensor may be bad? Problem with ISTA and other diagnostic flowcharts, they are based on what engineers thought 10-15 years ago- and NOT how these aging systems fail....