The ECM monitors the pressure in the secondary air passage using the pressure sensor connected to the ASV of the Secondary Air Injection (AIR) system.
If either of the following conditions occurs, the ECM interprets it as a malfunction of the secondary AIR system, and illuminates the MIL and sets a DTC:
• Exhaust gas pulsation is detected by the pressure sensor despite the ECM commanding the ASV to close.
• Exhaust gas pulsation is not detected by the pressure sensor despite the ECM commanding the ASV to open.
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