Which action is required before starting the ASM test?

Which action is required before starting the ASM test?

• A. Check that the vehicle is parked in a well-ventilated area
• B. Ensure the vehicle is restrained and wheel chocks are in place
• C. Confirm the MIL is ON
• D. Start the ASM immediately

Answer: (B)

The action required is to ensure the vehicle is restrained and wheel chocks are in place. This safety step prevents the vehicle from moving during the ASM test, which is crucial because the test involves running the engine and exha­ust sampling equipment. If the vehicle could roll or shift, it could cause injury, damage to the test setup, or skew the emission readings. In practice, this means applying the parking brake (keeping the vehicle from rolling) and placing wheel chocks behind and/or in front of the wheels as needed. While having a well-ventilated area is important for fumes and safety, it is not the action that directly ensures safe and accurate test operation at the moment you start the ASM. The MIL being ON indicates a fault and would not be an appropriate condition to begin or rely on for the test. Starting the test without securing the vehicle would defeat the safety and accuracy protections the procedure relies on.

The action required is to ensure the vehicle is restrained and wheel chocks are in place. This safety step prevents the vehicle from moving during the ASM test, which is crucial because the test involves running the engine and exha­ust sampling equipment. If the vehicle could roll or shift, it could cause injury, damage to the test setup, or skew the emission readings.

In practice, this means applying the parking brake (keeping the vehicle from rolling) and placing wheel chocks behind and/or in front of the wheels as needed. While having a well-ventilated area is important for fumes and safety, it is not the action that directly ensures safe and accurate test operation at the moment you start the ASM. The MIL being ON indicates a fault and would not be an appropriate condition to begin or rely on for the test. Starting the test without securing the vehicle would defeat the safety and accuracy protections the procedure relies on.