Air Injection: Testing and Inspection

Chart C-6:

Chart C-6 Wiring Diagram:

CIRCUIT DESCRIPTION:

This system has a single bed converter, and the air management is controlled by an air control valve (diverter valve).

When the ECM grounds the circuit, the solenoid causes the valve to direct air to the exhaust ports. When de-energized, air diverts to the atmosphere, and air will be diverted to the ports provided that the valve has grounded at the ECM, and good manifold vacuum exists.



TEST DESCRIPTION: The numbers below refer to circled numbers on the diagnostic chart.

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

2. Tests for a grounded electric divert circuit. Normal system light will be "OFF".

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