Monitor Description

The ECM monitors the pressure in the secondary air passage using the pressure sensor located on the air switching valve of the secondary air injection system. The sensor measures the pressure in the secondary air passage and transmits a signal to the ECM.

If either of the following conditions occurs, the ECM interprets it as a malfunction of the secondary air injection system, and illuminates the MIL and sets a DTC:

• The pressure indicated by the pressure sensor does not reach a certain level despite the ECM turning on the air pump.
• The pressure indicated by the sensor exceeds threshold levels despite the ECM turning off the air pump.