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  1. #1
    7,000rpm (Peak Power) Kelsonmassif's Avatar
    Join Date
    Mar 2003
    Posts
    3,677
    Location
    Wellington

    symptoms of a failed map sensor?

    hey just wondering what the symptoms are of a failed/faulty MAP sensor, other then just throwing a code, what things would usually happen if it was faulty?

    cheers

  2. #2
    Team NZH: Order of Merit Horny_Devil's Avatar
    Join Date
    Jun 2002
    Posts
    28,860
    Blog Entries
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    Location
    Auckland
    difficult to start when cold, rough idle, misfire or rough running, low in power

    heres how u test it, i hope u can understand it

    disconnect the plug, and looking at it with the tab on the top
    Right Slot: Yellow/White (+)
    Middle slot: Green/White (-)
    Left slot: White/Yellow (+)

    To test:
    Remove the plug from the map sensor, Turn the ignition on, measure the voltage between the Yellow/White wire to the cars body, there should be aprox 5 volts.

    If No: test between D19(+) and D21 (-) on the ecu, if theres aprox 5v there u have a wiring problem, if there is not aprox 5v there u have a bung ECU

    If Yes:Measure between the Yellow/White (+) and the Green/White (-) is there 5V there? No: theres a fault between the Green/White and pin D21 (-) on the ECU
    -------------------------------------------------------------------------------------

    If Yes then u need to measure between the White/Yellow (+) and Green/White (-) is there aproxiamtly 5v?
    ---------------------------------------------------------------------------------
    If No: measure bewteen D17 (+) and and D21 (-) on the ecu, if theres 5v there u have a wiring problem, if there is not aprox 5v there u have a bung ECU

    If ur sure the 5v signal is getting to the MAP sensor on both the + wires and the - wire is fine, get a new map sensor, if the wireing is fine and ur not getting 5v to the map sensor get a new ECU[/b]
    Quote Originally Posted by permaisuri View Post
    ooh yeah, i read it differently.... sorry, im asian with 4 eyes... shouldve read better....

  3. #3
    5,000rpm (VTEC Power!) -KONIG-'s Avatar
    Join Date
    Feb 2004
    Posts
    903
    Location
    Palmerston North
    Running an afc at all?
    Ex B18CR EK! Buddyclub, Apexi, Mugen, AEM, Koni, 4.785 Final drive!

  4. #4
    9,000rpm (S2000 Redline!) DURTYEF3's Avatar
    Join Date
    Jun 2006
    Posts
    7,334
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    5
    Location
    Manukau
    difficult to start when cold, rough idle, misfire or rough running, low in power
    Map sensor in the DC was stuffed, Had a rough idle like hes mentioned. as soon as check engine light come on it would idle up and down, would still drive but would be gutless azz, and sounded like it was on 3 cylinders

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