Component Diagnostic Charts - C3 System

Chart C-6C - Air Management Check:

Wiring Diagram for Chart C-6C - Air Management Check (EAC):

CHART C-6C - AIR MANAGEMENT CHECK (EAC)


Circuit Description:

The air management system has a single bed catalytic converter. An electric air control valve solenoid that directs air into the exhaust ports or the air cleaner. During cold start, the ECM completes ground circuit, the EAC solenoid is energized, and air is directed to the exhaust port "coolant" temperature increases, or system goes to "closed loop", the ECM opens the ground circuit, the EAC solenoid is deenergized, and air goes to the air cleaner.


Test Description:

1. This is a system performance test. When vehicle goes to "closed loop", air will switch from the ports and divert to the air cleaner.

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


3. Checks for an open control 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 fault is in valve connections or valve.

4. Checks for voltage from battery through a fuse to the solenoid.