Spectrum L4-91.5 1.5L (1989)
Vacuum Solenoid Valve (VSV) AIR System: Testing and Inspection
Chart C-6
Chart C-6 Wiring Diagram
DESCRIPTION
During cold operation the ECM grounds the circuit, energizing the solenoid and permitting air to go the exhaust and catalytic converter. During off idle
operation, the solenoid is de-energized by the ECM and the air is diverted to the atmosphere. When the engine is started and is already at operating
temperature, air is directed into the exhaust momentarily, then diverted to the atmosphere.
