Monitor Description

Air Injection Control Driver (AID) detects an open or short in the air pump and Air Switching Valve (ASV) circuit according to the terminal voltage and sends a signal as diagnostic information to the ECM.

When the air injection system operation is required while the engine is warming up, the ECM transmits command signals to the AID to drive the air pump and ASV.

The AID inputs the command signal from ECM if: 1) VP terminal voltage is low despite the AID inputting the command signal from the ECM to drive the ASV or 2,) VP terminal voltage is high despite the AID not inputting the command signal from the ECM.

The ECM sets the DTC based on the diagnostic information from the AID.