GM Service Manual Online
For 1990-2009 cars only

Service Bay Tests are included on the scan tool for some evaporative emission (EVAP) systems depending upon the vehicle make and model. They may be used to test certain EVAP systems and reset the System Status to Complete. The EVAP Service Bay Test is included for this vehicle.

Important: Ensure the vehicle meets the following requirements before performing the EVAP Service Bay Test. Failure to meet the necessary requirements may cause inaccurate test results or an EVAP Service Bay Test which will not run completely. This could lead to mis-diagnosis and unnecessary parts replacement.

The EVAP Service Bay Test can be performed when the vehicle meets the following conditions:

    • The Powertrain On-Board Diagnostic (OBD) System Check has been performed.
    • There are no diagnostic trouble codes (DTCs) set.
    • The battery voltage is between 10.5-17.5 volts.
    • The fuel level is between 15-85 percent.
    • The powerup engine coolant temperature (ECT) is less than 80°C (176°F).

Use the scan tool to perform the EVAP Service Bay Test. Select Special Functions and then the Service Bay Test. The instructions for performing the EVAP Service Bay Test will be displayed on the scan tool.