Air Injection Bypass Valve: Testing and Inspection

Chart C-6:

Air Injection Control:

CIRCUIT DESCRIPTION
This system uses a single bed converter and air management is controlled by an electric air control bypass valve.

When grounded by the ECM, the solenoid causes the valve to direct air to the exhaust ports. When deenergized air bypass to the atmosphere, air will go to the ports provided the valve has a ground to the ECM and good manifold vacuum.

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.

1. This is a system performance test. When vehicle goes to "Closed Loop," air will switch from the ports to bypass.

2. Tests for a grounded electric air control bypass valve circuit. Normal system light will be "OFF."

3. Checks for an open electric air control bypass valve circuit. Grounding "test" terminal will energize the solenoid if ECM and circuits are normal. In this step, if test light is "ON," circuits are normal and faulty is in valve connections or valve.