GM Service Manual Online
For 1990-2009 cars only

System tests, using the scan tool, allow for the display of values as actually seen or commanded by the following various systems:

    • The PCM
    • The instrument cluster
    • The SDM
    • The EBCM
    • The BCM

The test types available are dependent upon the system selected, but may include the following types:

    • Data (Analog Inputs)
        Data (Analog Inputs) display analog values as seen by the system.
    • Inputs and outputs
       - Inputs and outputs display digital values as seen by the system.
       - Inputs and outputs provide an indication of whether the input or output has cycled.
    • Special Functions (output controls)
        Special Functions (output controls) allow for outputs of the system to be set at a desired value (ON or OFF).
    • Clear Codes
        Clear Codes will erase all of the DTCs stored for the system currently selected. If the malfunction is still present, the DTC may immediately reset.