1997 K1500 Fuel Tank Pressure Sensor?

[EagleMark]

and what is needed to pass in Wa? Is it a plug in OBDII test?

That has me thinking, I need to find the published technical material to figure out if the fuel tank pressure sensor is an input / output to the Evaporative Emission Purge Valve (which is controlled by the PCM). I'm thinking most likely an input, but where? The fuel tank is from a single tank system, so is the fuel tank pressure system used by the fuel pump balance system? The vehicle is a daily driver, that has to pass emissions, so I need to get my homework done correctly.

dave w

I'm just not sure? Even single tanks have the pressure, although I don't know what code my kid used to find them all the time when he worked at Oriellys. Loose gas cap after fill up will cause it.

[EagleMark]

This will be helpful!

A B and C error reporting are for how the error is reported. Type A turns on the light at the first error. Type B waits until a second failure is seen. Type C only reports the problem if you check with a scan tool. A code can still be stored but the check engine light won't turn on. If you uncheck the box then it won't run the test. This means the OBDII monitor won't set and dependent tests won't run either. For example, if you don't run the secondary O2 tests then the cat converter test won't run. If you select "no error reporting" the test runs and passes instantly... readiness monitors show "ready" and dependent tests run. In places where you have to do the OBDII plugin emissions test you're better off with "no error reporting." If you know the system isn't on your vehicle and there's no side effect to unchecking the box, go ahead and remove the check.