CEL came on yesterday, 2006 ODB trouble codes
- Thread starter 2006Tahoe2WD
- Start date
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2006Tahoe2WD
Full Access Member
It gets inserted in the top part of the fuel pump assembly.
2006Tahoe2WD
Full Access Member
As I understand.... The three devices (purge, vent, pressure sensor) work together to get the gas fumes burned up and to tell if that system is working without any "holes". I imagine the pressure sensor could go bad and the ECU thinks there is a leak when there isn't.
2006Tahoe2WD
Full Access Member
Minor update. I looked at the active tests available on the Foxwell 510 and there is a vent valve "test". You can turn the vent valve on and off manually. The good thing is the gas tank pressure sensor readings along with the purge valve command are also listed. So I tried this test for the 5th+ time and when I close the vent valve the pressure starts going to more vacuum. This means the purge valve is not closing all the way. The new purge valve should be here in a day or so. Side note: the reading from the tank pressure valve seem to be smooth and what might be expected. Hopefully the tank pressure sensor is okay. Big project to change that out. Probably need to drop the tank a bit. There are Silverado videos where they raise the bed instead of dropping the tank - I can't do that (Tahoe).
The tanks are not that difficult to drop slightly to get to the fuel tank pressure sensor, but are a bit more involved to fully drop. Not an impossible task although, when fully dropping, the lines you disconnect can vary between the flex fuel and the gasoline-only tank styles. I'm not sure how much difference there is between my '04 Flex Fuel and your 2006, though. Pulling the driveshaft can help with that access.
Easy enough to drop somewhat for access to reach the top of the fuel pump, especially if the tank is nearly empty. Cross that bridge when you come to it.
Easy enough to drop somewhat for access to reach the top of the fuel pump, especially if the tank is nearly empty. Cross that bridge when you come to it.
2006Tahoe2WD
Full Access Member
Sure, as you say hopefully not too bad to drop just enough for the pressure sensor. There was a video where a guy did that. Didn't look too fun. How about cutting a hole in the floor?
2006Tahoe2WD
Full Access Member
Here is a video of a pressure sensor change without dropping the tank all the way.
How about cutting a hole in the floor?
I have a feeling that you're not that kind of guy.
I found on mine that if I pull the driveshaft I can get my head up in the driveshaft tunnel, and be able to see what I'm doing on the top of the tank. Just disconnect the rear u-joint and let the end down, or remove it completely. If you remove it you might want to have a small pan near the end of the transmission to catch any fluid that might come out.
If you cut a hole in the floor.................I have no words! Butcher job! I guess I did have words!
Just so you know what it looks like under there without the tank, here's a pic. That way you won't have to drop yours all the way to see!
