Air Injection: Testing and Inspection

AIR Management Diagnosis:

DFI Emission Circuit:

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

1. With a cold engine, the air management system should switch air to the exhaust ports to help oxidize the rich mixture that exists during cold starts and warmup.

2. With a warm engine, the air should be switched to the converter to oxidize the exhaust gas flowing to the second bed of the catalytic converter.

3. Checking for the air system to "DIVERT" air away from the converter during acceleration and deceleration. The divert function protects the converter from the following rich conditions that occur:
a. During acceleration.
b. During power enrichment.
c. When th throttle is closed to start deceleration.

4. Checking for vacuum supply to the air management valves.

5. Checking for air pump operating.

6. This branch of the tree will check for ECM ability to control air switch and air divert solenoids.

7. Checking for open to voltage to solenoid.

8. Checking for a low resistance solenoid. If resistance is less than 20 ohms, replace the air management solenoid.