What should a technician do if the vacuum hose has fallen off the EGR valve during an ASM inspection?

What should a technician do if the vacuum hose has fallen off the EGR valve during an ASM inspection?

• A. The technician may reconnect the vacuum line prior to the test.
• B. The hose must be left disconnected.
• C. The test must be canceled.
• D. The vehicle must be retimed.

Answer: (A)

The key idea is that the EGR system must be able to operate during the emission test. A vacuum hose that has fallen off prevents the EGR valve from opening, which would make the test readings unreliable and could mask a real problem. Therefore, reconnect the vacuum line before running the ASM test, and check the hose and connections for damage or wear so the EGR can function normally during the evaluation. Leaving the hose disconnected would keep EGR inoperative and skew results, canceling the test isn’t required just because a hose came off, and retiming isn’t related to the vacuum line on the EGR valve.

The key idea is that the EGR system must be able to operate during the emission test. A vacuum hose that has fallen off prevents the EGR valve from opening, which would make the test readings unreliable and could mask a real problem. Therefore, reconnect the vacuum line before running the ASM test, and check the hose and connections for damage or wear so the EGR can function normally during the evaluation.

Leaving the hose disconnected would keep EGR inoperative and skew results, canceling the test isn’t required just because a hose came off, and retiming isn’t related to the vacuum line on the EGR valve.