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  1. #1
    Enthusiast Sniper's Avatar
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    Mainfold pressure throttle pos correlation

    What would cause this error and throw car into limp mode?

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  2. #2
    Enthusiast Lawineer's Avatar
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    I think it’s saying your intake manifold pressure doesn’t match up what it should be for a given throttle position. Either a vacuum leak or pair of turbos would be my guess.
    2013 GTS- Black w/ Gunmetal stripes. DSC Tractive Coilovers, ACR sways, carbon stuff, TA spoiler.
    2014 BRZ: Race/track car. Full retarded. 2016 Lexus GX460: Full boring

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  4. #4
    Enthusiast Sniper's Avatar
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    Could this possibly be from smooth tubes?

  5. #5
    Enthusiast Steve M's Avatar
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    Quote Originally Posted by Sniper View Post
    Could this possibly be from smooth tubes?
    In my limited experience, any changes to the intake tract forward of the throttle bodies can cause issues like this. Putting it back to stock to see if the problem persists would be a relatively quick and easy way to test your theory.

    What were you doing when it threw that code?
    2008 SRT-10 Coupe - Venom Red Metallic w/ White Stripes - 1/4 Mile Passes (YouTube)
    High Flow Cats | Gen 5 Intake Man. | UDP | HPT | 3.55s | MCS | DSS Axles | Nth Moto Clutch | 10.86 @ 130.66, 1.68 60' (+1,344 ft DA, w/ 3.55s & Hoosier Drag Radials)

  6. #6
    Enthusiast Sniper's Avatar
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    Driving at a normal rate of speed. I took car out for about 2 hours and it threw this code 4-5 times.
    Maybe try a throttle relearn?

  7. #7
    Enthusiast Steve M's Avatar
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    Throttle relearn isn't going to fix this one - that'll only calibrate the gas pedal to throttle bodies.

    For the drive-by-wire system to work properly (i.e. not throw codes), the MAF sensor readings have to match the expected MAP sensor readings for a given throttle blade position. It's when one of those things gets out of some predefined boundary that the system thinks it could be a runaway throttle condition and it clamps down to keep the driver "safe". Which really isn't all that safe depending on when it happens, but better than an uncontrollable WOT situation.

    I'd put the intake back to as stock as possible and see what happens.

    There have been Gen 4 owners that have had major issues with something as simple as smooth tubes, and putting it back to stock fixed the problem. Some cars are more sensitive than others...yours is likely operating closer to the edge of tolerances, so all it took was a little bump to throw it out of bounds.

    My $0.00.
    2008 SRT-10 Coupe - Venom Red Metallic w/ White Stripes - 1/4 Mile Passes (YouTube)
    High Flow Cats | Gen 5 Intake Man. | UDP | HPT | 3.55s | MCS | DSS Axles | Nth Moto Clutch | 10.86 @ 130.66, 1.68 60' (+1,344 ft DA, w/ 3.55s & Hoosier Drag Radials)

  8. #8
    Enthusiast Sniper's Avatar
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    Would an Arrow PCM be able to fix this issue?

  9. #9
    Enthusiast Steve M's Avatar
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    Quote Originally Posted by Sniper View Post
    Would an Arrow PCM be able to fix this issue?
    Possibly.
    2008 SRT-10 Coupe - Venom Red Metallic w/ White Stripes - 1/4 Mile Passes (YouTube)
    High Flow Cats | Gen 5 Intake Man. | UDP | HPT | 3.55s | MCS | DSS Axles | Nth Moto Clutch | 10.86 @ 130.66, 1.68 60' (+1,344 ft DA, w/ 3.55s & Hoosier Drag Radials)

  10. #10
    Enthusiast Sniper's Avatar
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    I just read on their site which states:
    Air flow rationality diagnostic disabled which permits greater range of flow modifications

  11. #11
    VOA Mamba Member
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    Arizona Vipers's Avatar
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    I'd reset it with a code scanner and see if that fixes it, could have just been a fluke
    Follow my Instagram- @9literviper 2013 track car, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10

  12. #12
    Check vacuum lines to/from the intake manifold. There are a few. The ones underneath/behind the throttle body that intersect in a t-shape popped off at one point for me and threw this code. Check intake manifold for cracks/seal.

  13. #13
    Enthusiast GTS Dean's Avatar
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    When the throttle opens, manifold pressure should increase from high vacuum toward atmospheric at a fairly linear rate. As others have said, check hose connections for leaks. It could be TPS or MAP voltage not changing signal value normally. I'd unplug the connectors and tap/jiggle some things to make sure nothing is loose.
    96 GTS. Viper Days Modified Class. Fresh motor 10-2020!

  14. #14
    Enthusiast Whitey's Avatar
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    Quote Originally Posted by Arizona Vipers View Post
    I'd reset it with a code scanner and see if that fixes it, could have just been a fluke
    ^^^ this. Maybe an easy fix.
    2015 White GTC

  15. #15
    Enthusiast Steve M's Avatar
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    Quote Originally Posted by SLP View Post
    Check vacuum lines to/from the intake manifold. There are a few. The ones underneath/behind the throttle body that intersect in a t-shape popped off at one point for me and threw this code. Check intake manifold for cracks/seal.
    This is a good thought.

    If it is one thing I've found, it is that any time my car has thrown a code, it has been for a reason. Those lines would be a good place to start.
    2008 SRT-10 Coupe - Venom Red Metallic w/ White Stripes - 1/4 Mile Passes (YouTube)
    High Flow Cats | Gen 5 Intake Man. | UDP | HPT | 3.55s | MCS | DSS Axles | Nth Moto Clutch | 10.86 @ 130.66, 1.68 60' (+1,344 ft DA, w/ 3.55s & Hoosier Drag Radials)

  16. #16
    Enthusiast Sniper's Avatar
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    Well, went for 2 hour ride tonight and didn’t throw a code…

  17. #17
    Short in a 5v reference circuit.
    14 black venom TA, the only one 17 comp blue silver striped acr

  18. #18
    Enthusiast Sniper's Avatar
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    Short in a 5v reference circuit, what does this mean?
    Last edited by Sniper; 06-29-2022 at 01:23 PM.

  19. #19
    It means that f855 5v supply circuit is intermittently shorting out to ground, either by any component that it supplies or getting chafed by a actual ground source.
    Talk to a local dealer(s) to see if they have a good and dedicated electrical/drivability tech that’s been around for a while. Good chances he ll narrow it down without throwing darts.
    14 black venom TA, the only one 17 comp blue silver striped acr

  20. #20
    Enthusiast Sniper's Avatar
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    Last edited by Sniper; 07-04-2022 at 02:28 PM.

  21. #21
    Enthusiast Steve M's Avatar
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    Full mod list?
    2008 SRT-10 Coupe - Venom Red Metallic w/ White Stripes - 1/4 Mile Passes (YouTube)
    High Flow Cats | Gen 5 Intake Man. | UDP | HPT | 3.55s | MCS | DSS Axles | Nth Moto Clutch | 10.86 @ 130.66, 1.68 60' (+1,344 ft DA, w/ 3.55s & Hoosier Drag Radials)

  22. #22
    Enthusiast Sniper's Avatar
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    Belanger headers
    Hi flo cats
    Race mufflers
    Smooth tubes

  23. #23
    Enthusiast Steve M's Avatar
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    When's the last time you checked for melted wires around the headers?
    2008 SRT-10 Coupe - Venom Red Metallic w/ White Stripes - 1/4 Mile Passes (YouTube)
    High Flow Cats | Gen 5 Intake Man. | UDP | HPT | 3.55s | MCS | DSS Axles | Nth Moto Clutch | 10.86 @ 130.66, 1.68 60' (+1,344 ft DA, w/ 3.55s & Hoosier Drag Radials)

  24. #24
    Enthusiast Sniper's Avatar
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    I haven’t checked at all. I’ll have to take it to a dealer to have it looked at.

  25. #25
    Enthusiast Sniper's Avatar
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    Is there a throttle position sensor for the Gen Vs?


 
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