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OBII code parameters

This is a discussion on OBII code parameters within the Firebird / WS6 forums, part of the Vehicle Specific category; Where can I find the ranges for the live streaming sensors, fuel trims, O2 sensors, etc....

  1. #1
    Join Date
    Jun 2012

    OBII code parameters

    Where can I find the ranges for the live streaming sensors, fuel trims, O2 sensors, etc.

  2. #2
    Super Moderator pajeff02's Avatar
    Join Date
    Feb 2009
    Mansfield, PA

    Black & Blue
    '02 WS.6 / '07 Suburban

    The service manual generally has that information in the troubleshooting sections. Do you have a specific question?

    Fuel trims should be fairly close to zero -- which means that the PCM is not adding or subtracting fuel. Mine range around +/- 2 to 3 at the most if I recall. The O2 sensor output for the narrowband stock style sensors is essentially unreadable if it is working properly. They rapidly cycle up and down from around 100 to 800 mV, with 450 mV representing a stoichiometric mixture. If the sensor data is sluggish or not moving at all, there is generally a problem with the sensor or wiring.
    Last edited by pajeff02; 07-16-2012 at 06:23 PM.

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