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  1. #1
    Super Moderator dave w's Avatar
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    1997 K1500 Fuel Tank Pressure Sensor?

    I'm wondering if the the PCM controls the Fuel Tank Pressure Sensor on a 1997 K1500?

    Thanks,

    dave w
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    RIP EagleMark's Avatar
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    P0452 Evaporative Emission Control System Pressure Sensor Low Input
    P0453 Evaporative Emission Control System Pressure Sensor High Input

    Are both listed in 1997 Vortec cal and both unchecked for no reporting.

    I think P codes are from PCM, then there's B codes which are Body Control Module, and C codes which are ABS/Suspension... there's a pattern but some codes overlap like these Fuel Sender is in B and Fuel Tank Pressure in B on later vehicles...

    Then U codes is missing data stuff.

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    Super Moderator dave w's Avatar
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    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

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    so..... are you looking for wiring diagrams, or just how it functions?
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    Super Moderator dave w's Avatar
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    Quote Originally Posted by RobertISaar View Post
    so..... are you looking for wiring diagrams, or just how it functions?
    I'm some what new to OBDII fuel tank emission requirements, so I'm wondering what the theory of operation is fuel tank pressure sensor... what does it input / output to (PCM controlled), is what I'm wanting to figure out. I can find the wiring schematics.

    dave w

  6. #6
    Fuel Injected! gregs78cam's Avatar
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    NM. much better explanation Robert.
    Last edited by gregs78cam; 05-26-2013 at 06:27 AM.
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    RIP EagleMark's Avatar
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    and what is needed to pass in Wa? Is it a plug in OBDII test?


    Quote Originally Posted by dave w View Post
    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.

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    RIP EagleMark's Avatar
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    This will be helpful!

    Quote Originally Posted by 1project2many View Post
    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.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
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