P0410, P0414
SECONDARY AIR INJECTION - AIRFig. 1 Air Pump:
Monitoring Procedure
This diagnostic operates only once per ignition cycle, during the first long duration hot idle period after engine start. Air injection operation is started and the change in AFT closed loop control value is monitored, After a while, if this value does not change by at least a pre-determined value, then the secondary air system malfunction judgement is made. The diagnostic trouble code (DTC) is stored if the failure judgement is made on two successive ignition cycles.
If the fuel system diagnostic has flagged a lean failure on both banks, the air injection switching valve circuit failure judgment is made. The DTC is stored if the failure judgement is made on two successive ignition cycles.
Fig. 1 Air Pump:
The vane type pump of the secondary air injection system is driven by a multi-groove belt via a magnetic clutch.
Fig. 2 ECM Interface:
Fig. 1 ASV Location:
ASV Cross-Section:
The Air Switching Valve (ASV), operated by vacuum, controls the flow of air for injection.
Fig. 3 VSV Location:
Fig. 1 VSV Section:
A vacuum solenoid valve (VSV) provides a vacuum switching function for the air switching valve, in response from an electrical signal, to control a vacuum servomotor.
Fig. 2 Operating Schematic Of VSV:
Fig. 3 ASV/VSV Vacuum Circuit:
When the solenoid is energized, ported vacuum flows to the air switching valve causing it to open. When the solenoid is de-energized, ported vacuum is not applied to the air switching valve, causing it to close.