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Thread: Problem logging SAE.MAP pid

  1. #1
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    Default Problem logging SAE.MAP pid

    I am in the process of converting over to COS3 with a 3 bar map sensor. We got the map sensor scaled close, so at atmosphere it is reading around 99 kpa at around 1.5 volts.

    Problem is the SAE.MAP pid will not read a value above 105 kpa.

    We tried to view the SAE.MAP pid to see if it was reading correctly and it pulled a vacuum down to 17 kpa and hooked in compressed air around 20psi and saw a voltage logged onto GM.MAP pid of 4.5 volts.

    It appears the sensor is working properly (And we tried two sensors) Does anyone know how to change the upper limit of the SAE.MAP pid to read above 105kpa?

    Any help would be awesome! Thanks in advance.

  2. #2
    Joe (Moderator) joecar's Avatar
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    Hi TransAm-Z welcome to the forum.

    Post log file and screenshots.

  3. #3
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    Default LOG-FILE attached!

    Quote Originally Posted by joecar View Post
    Hi TransAm-Z welcome to the forum.

    Post log file and screenshots.
    Thanks! Here is a screenshot showing the data tab for the test.

    I hooked up a vacuum pump to the MAP sensor and pulled the vacuum down to 16kpa and both GM.MAP & SAE.MAP PIDs seem to function properly. I then slowly pressured the map sensor to about 30psi with my air compressor. The GM.MAP PID shows 4.9 volts, but the SAE.MAP PID only reaches 105 kpa.

    If you look at the log file you can see the SAE.MAP PID pegs at 105kpa as the GM.MAP voltage keeps climbing.

    Is there some setting in the scan software for boosted engines?

    joecar: Thanks for your help with the COS05 to COS03 upgrade (Crussn-SS sent you a PM) upgrade went off without a hitch.
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  4. #4
    Joe (Moderator) joecar's Avatar
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    If you have a multi-bar MAP sensor, you will need to set the MAP scaler in the engine diagnostics section, see C6301.

    COS5->COS3: cool I'm glad it went good, thanks
    Last edited by joecar; July 2nd, 2011 at 02:52 AM. Reason: typo

  5. #5
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    Quote Originally Posted by joecar View Post
    If you have a multi-bar MAP sensor, you will need to set the MAP scaler in the engine diagnostics section, see C6301.

    COS5->COS3: cool I'm glad it went good, thanks
    We did set the scaler in C6301 to 288 yesterday, which seems to be very close, but still needs slight tweaking. I am new to all this stuff, but it seems like the issue is with the logging software as the voltages for the sensor 0-5 volts seems to be very close to the conditions I put the sensor in 16 kpa to around 30 psi gave me .1 to 4.9 volts.

    Is there a setup text file for the SAE.MAP PID that would control the display limits for the max map value?

  6. #6
    Joe (Moderator) joecar's Avatar
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    The chart display limits: on the chart go rightclick->Chart Properties, click the Series tab, you can edit the min/max display limits.

  7. #7
    Joe (Moderator) joecar's Avatar
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    Something is wrong, SAE.MAP pegs at 105kPa while GM.MAP voltage continues to rise...

    What OS did you start from...?

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    Quote Originally Posted by joecar View Post
    Something is wrong, SAE.MAP pegs at 105kPa while GM.MAP voltage continues to rise...

    What OS did you start from...?
    Originally the car had OS05. We did a full reflash with OS03 the used the OS05 that we downloaded from the car to do the calibration.

    Maybe using the OS05 as the calibration caused a problem?

  9. #9
    Joe (Moderator) joecar's Avatar
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    Did you have the full range on SAE.MAP before (with COS5)...?

    Try going back to COS5 (all you need to do is full flash from the COS5 file).

  10. #10
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    I will try that! If that doesn't work I will Flash COS03 (02020003) then calibrate it with the stock tune for that car.

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