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Thread: Sensor "A" circuit low

  1. #1
    Fuel Injected!
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    Sensor "A" circuit low

    P59 running a Jeep inline 6 cyl. I keep getting these fault codes P0101, P0102, P0122 and P0341.
    Can some one tell me how to tell if it's a voltage issue or what?

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  3. #3
    Super Moderator dave w's Avatar
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    Typically the CMP & CKP sensor have a reference voltage provided by the PCM, most times +12VDC.

    https://www.lt1swap.com/pictures/03t...%20Sensors.gif

    The MAF typically gets voltage from the fuse block.

    https://www.lt1swap.com/pictures/03t...p%2C%20VSS.gif

    dave w

  4. #4
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    P0101 MASS AIR FLOW SYSTEM PERFORMANCE
    P0102 MASS AIR FLOW CIRCUIT LOW FREQUENCY
    P0122 THROTTLE POSITION SENSOR CIRCUIT LOW VOLTAGE
    P0341 ?

    Don't know the P59 but as indicated above I believe MAF runs off battery, tps runs off 5V generated by the PCM.

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