Thread: P0069 kicking my xxx!

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  1. #1 P0069 kicking my xxx! 
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    I have an 05' GTP and have been having a lot of issues with it. Most I have figured out. I keep getting a P0069 MAP and Baro correlation error. Well that's all well and good I understand what it means. This is what I have tried so far.

    Added a boost gauge to see what the manifold pressure is. This is Teed into the MAP sensor. 18-20" at idle

    Viewed the freeze frames and the Baro shows 29.5" the MAP is always showing 18.5"

    Bought a Wells MAP and the car didn't like it at all.

    Checked the voltages at the devices have 5V, .5ohm to ground and the signals are where I would expect.

    I bought 2 new sensors (same for both) changed the Baro no change, changed the MAP and it ran better.

    I was able to get into boost just rolling on the throttle getting up to about 5psi then just cruising. Did this a few times and then I started having the stalling and not able to go into boost (basically it would die like it's super lean or rich) it sputters and spits and I have to drop down a gear or 2.

    I played with the hoses around the MAP because I noticed that in gear I had lost about 2" Hg. Seemed better.

    I borrowed a more advanced scanner and watched live data of the sensors. MAF seemed normal map showed about 10" which was way off my 18" on my gauge. Baro was holding steady at 29.5". I varied engine speed and it seemed to respond. I put another MAP and got higher readings in the 12"-15" range then played with it again and got it to 18" and the gauge reading a solid 20".


    Thought about it and figured 10 year old hoses so I replaced the short piece that comes out of the nipple to the filter with the two outlets. I used wire ties and a ty wrap gun to secure the hose firmly. I did this with all the other fittings both sides of the one leading to the bypass solenoid and all the ones on the T for the boost gauge and MAP.
    I thought that the short piece of hose leading to the filter splitter thing was really cracked.

    After that the car ran pretty hard and didn't stall I took it to 7-8psi a couple of times and it did pretty well but seemed to lay over(lose power) pretty quick and I let off and cruised.

    I've driven the car around about 150 miles and it is running pretty good but I ran codes on it when I got home and the damn thing is back! It hasn't set an MIL but it shows on a scan.

    I'm really at a loss, I have checked every vacuum fitting and everything is tight. The car runs pretty well but will not go into boost anymore. I can stomp it and the RPMs will come up and the tires will spin, but the boost gauge shows 0. I can roll onnit on the freeway and it will go to 1-2psi then drop to 0. I can kick it into passing gear and it will show 0, sometimes it will come up to 5psi then drop to 0.

    Thanks,

    Jeff
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  2. #2 Re: P0069 kicking my xxx! 
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    I'm having the same issue where if i do an aggressive 4-2 or 3-1 dropshift, the car goes into limp mode/reduced engine power, and sets p0068. i've been doing some research and it seems that code is usually MAF or throttle body related. where did you get the MAP and BARO code info? see the link-it gives info on p0068 diagnostics etc.
    http://www.3800pro.com/forum/cams-he...ode-p0068.html

    I have an LQ4 maf and am running ZZP's maf adapter harness. I'm thinking that's suspect so i hard wired in an LQ4 harness last night and will test drive the car today to see if it helped anything.
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  3. #3 Re: P0069 kicking my xxx! 
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    I'm not getting P0068 that is a Throttle position and engine load correlation error. I'm getting P0069 which is a Barometric pressure MAP pressure correlation error.

    I'm Not even sure what a LQ4 MAF is not do I know even what year car you have. Mine is an 05' and is drive by wire. I also have the stock MAF.

    Jeff
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  4. #4 Re: P0069 kicking my xxx! 
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    Ok, I was able to reproduce your results, with the added bonus of losing all throttle control. I was in a safe area anyway and pulled into a parking lot. Pulled codes and got a P0068.

    I got my larger pulley on and installed it. Went for a drive and it still would not go into boost. I pulled over bypassed the boost solenoid and noticed the hose for the bypass looked pretty bad. I took off and found that it still would not go into boost. I did a couple of hard stabs at the throttle it just didn't seem right. No knock I could hear. I turned onto a street and stretched it out harder and it just didn't have the power. I did it one more time after getting to a slow 10 mph roll and romped on it and it just didn't have the power and when I let off that's when the DIC and MIL came on and started going crazy.

    I pulled the codes and took pics of the freeze frames and shut the car off and reconnected the solenoid started it up and drove off like nothing happened.

    Jeff
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  5. #5 Re: P0069 kicking my xxx! 
    GXP Level Member Turbocharged400sbc's Avatar
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    while the rubber T at the end of the LIM below the snout may be "tight" its generally got a crack if its ever been moved or disturbed/unplugged.

    being that its ten years old id say to take it off and replace it with something of similar function
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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  6. #6 Re: P0069 kicking my xxx! 
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    I did replace it, and wire tied all other connections.
    Last edited by J57ltr; 04-11-2015 at 08:35 PM.
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  7. #7 Re: P0069 kicking my xxx! 
    GXP Level Member Turbocharged400sbc's Avatar
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    are you still running an oem paper air foleter or do you have a K&N/intake setup.

    ive seen filthy sensor elements cause correlation/diagnostic failures in the limp modes.

    please also confirm that both map sensors have the same 2 bar part numbers. ivee seen "swap with known good" diagnostics that end up with a 1 bar swapped on and since it didnt change anything they didnt swap back....
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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  8. #8 Re: P0069 kicking my xxx! 
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    It's a K&N and I'm aware of getting oil onto the elements and how to clean them. I did that two times already.

    The 2 sensors are the same part number and are both 2 bar. I have a total of 5 3 of which are the same part number one that is an older superceded part number and another I looked up and is an alternate all read about 2.3V at rest referenced to ground. When viewing with a scanner I read 29.5" on the Baro and 18.5 on the MAP at idle.
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  9. #9 Re: P0069 kicking my xxx! 
    GXP Level Member Turbocharged400sbc's Avatar
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    18.5 in/Hg is low for a stock cam car. you may have a vac leak that is the root of all these shenanigans
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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  10. #10 Re: P0069 kicking my xxx! 
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    It usually shows 20 on the gauge in drive or reverse and just under 20 in park or neutral. The scanner numbers are freeze frames so it seems to only read those when an error pops up.

    jeff

    i can post up the information from the scans if it would help.
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  11. #11 Re: P0069 kicking my xxx! 
    Turbo is the way to go. BillBoost37's Avatar
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    DTC P0069
    Circuit Description

    The barometric pressure (BARO) sensor is a transducer that varies resistance according to changes in altitude and atmospheric conditions. This gives the powertrain control module (PCM) an indication the current of barometric pressure. The PCM uses this information to calculate fuel delivery. The BARO sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The PCM supplies 5 volts to the BARO sensor on a 5-volt reference circuit, and provides a ground on a low reference circuit. The BARO sensor provides a voltage signal to the PCM on a signal circuit relative to the pressure changes. The PCM compares the BARO sensor to the manifold absolute pressure (MAP) sensor in order to monitor the BARO sensor operation. If the difference between the two sensors is more than a predetermined amount, DTC P0069 sets.
    DTC Descriptor

    This diagnostic procedure supports the following DTC:
    DTC P0069 Manifold Absolute Pressure-Barometric Pressure Correlation
    Conditions for Running the DTC

    DTCs P0068, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0125, P0128, P0220, P0502, P0503, P2135 are not set.

    DTCs P2227, P2228, P2229, where applicable, are not set.

    The ignition is ON.
    Conditions for Setting the DTC

    The PCM detects that the difference between the BARO sensor pressure and the MAP sensor pressure is more than 5 kPa when the ignition is ON before engine startup.

    OR

    The difference between the BARO sensor pressure and the PCM predicted BARO is more than 60 kPa when the engine is running.

    The above conditions are met for 1 second.
    Action Taken When the DTC Sets

    The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
    The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
    Conditions for Clearing the MIL/DTC

    The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.

    A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

    A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.

    Clear the MIL and the DTC with a scan tool.
    Test Description

    The numbers below refer to the step numbers on the diagnostic table.

    1. This step tests the ability of the BARO sensor to correctly indicate barometric pressure. The value shown for the BARO sensor varies with altitude and weather conditions.
    2. This step tests the ability of the MAP sensor to correctly indicate barometric pressure.
    3. This step tests for a sensor that is stuck in range.
    4. This step calculates the resistance in the 5-volt reference circuit.
    5. This step calculates the resistance in the low reference circuit.
    6. This step calculates the resistance in the 5-volt reference circuit.
    7. This step calculates the resistance in the low reference circuit.
    I drink..so consider that when reading my posts.

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  12. #12 Re: P0069 kicking my xxx! 
    Turbo is the way to go. BillBoost37's Avatar
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    I would check with key off and see if the two are equal.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  13. #13 Re: P0069 kicking my xxx! 
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    Bill, thanks for that information. That gives me more to go on. It looks like some of the test procedures are missing, but I assume most of them I have already tested, source voltage, resistance to ground and resting signal voltage. When I tested with the better scanner I checked the scanner and got both the Baro and Map to read the same thing with the key on engine off.

    5kPa is equal to 1.476"Hg or .725psi so this would have to be he difference when you first start the car 2 times.

    and the difference when the engine running is 17.72"Hg or 8.7psi

    basically that comes out to a differential of 32.167kPa when the engine is idling. At 10 psi that is a differential of 30.939kPa, that's if I did my math right.


    Thanks for for the info I'm going to digest this a little longer
    Jeff
    Last edited by J57ltr; 04-13-2015 at 12:52 PM. Reason: autocorrect messing up again
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  14. #14 Re: P0069 kicking my xxx! 
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    Always get acdelco parts! And if the map red 5psi that's still vacuum, boost isn't until the map readings get past barometer. So if the barometer reads 14.3 psi that's normal for where I live in Wisconsin, so when the map sensor reads 15.3 psi that's 1psi of boost not 15.3 because atmospheric pressure is 14.3 so any map reading under 14.3psi is vacuum.. you don't get boost until you exceed atmospheric pressure.. my comp g map will hit 23 psi during the summer and 24 to 25 psi in winter which would mean there is 8.7psi boost in the summer and 10.3 on a cold winter day.. I know this is a old thread but figured I would still add some info to help anyone that still drives the gtp like I am
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