Secondary Air Solenoid -- Manual Transmissions Only

NAME OF CODE:
Secondary Air Solenoid

WHEN MONITORED:
After engine start up at idle and slightly off idle. The secondary air solenoid is monitored by the PCM and works in conjunction with the aspirator valve, which, at higher engine speeds, remains closed.

SET CONDITION:
The secondary air solenoid circuit is not in the expected state when requested by the PCM.

THEORY OF OPERATION:
The secondary air solenoid allows the air aspirator system to be turned ON or off at specific operational modes. This system contains an air shut off solenoid in line between the air cleaner and the aspirator valve. The air shut-off valve is a vacuum actuated diaphragm valve with an electric solenoid to control vacuum supplied to the diaphragm valve. An aspirator valve utilizes exhaust pressure pulsation to draw air into the exhaust system reducing carbon monoxide and to a lesser degree, hydrocarbon emissions. The system draws fresh air through the air cleaner and passes it through either a steel reed valve or a loaded one-way rubber diaphragm.

POSSIBLE CAUSES:
- Open/short secondary air solenoid circuit
- Open fused ignition switch output circuit to splice
- Secondary air solenoid
- PCM failure