What is the result if the MIL illuminates during an ASM test?

• A. The vehicle passes the MIL functional check.
• B. The vehicle fails the MIL functional check.
• C. The MIL status should be reset before continuing.
• D. The test is suspended until the MIL is cleared.

Answer: (B)

The MIL (Malfunction Indicator Lamp) is the flag the engine computer uses to signal a fault. In an ASM test, the procedure checks how the MIL behaves when the system detects issues. If the MIL illuminates, it means a fault has been detected and the indicator is doing its job correctly. However, for the MIL functional check to pass in this context, the test expects the system to show as not faulted under the test conditions; illumination indicates a fault condition that the test is intended to reveal, so the MIL functional check fails. In practice, you would diagnose the fault causing the MIL to light, fix it, and then re-run the test after clearing codes.