Air Injection: Testing and Inspection

AIR INJECTION PUMP


1. Remove hose from A.I.R. Injection Manifold Check Valve prior to starting engine. Start engine and accelerate to approximately 1500 RPM and observe air flow from hose. If air flow increases as the engine RPM increases the air pump is OK. If not proceed as follows:
2. Check to make sure air pump is not seized.
3. Check for proper drive belt tension.
4. Check air pump for leaking pressure relief valve. Air leakage may be heard from this valve with engine running.
5. Check hoses, tubes and connections for proper routing and no leakage.
6. Check air injection pump for proper mounting.


CHECK VALVE



Whenever a hose is removed from a check valve it should be inspected. Replace check valve if the hose shows signs of exhaust gas contamination. Little or no air should be felt coming from check valve with engine running at idle. Air should flow freely through the valve towards the engine cylinder head.



AIR MANAGEMENT CHECK

Chart C-6C - Air Management Check (Electronic Air Control Valve):

Wiring Diagram For Chart C-6C - Air Management Check (Electronic Air Control Valve):

AIR MANAGEMENT CHECK (ELECTRONIC AIR CONTROL VALVE)

CIRCUIT DESCRIPTION:

An electric air control valve solenoid directs air into the exhaust ports or the air cleaner. During cold start the ECM completes the ground circuit, the EAC solenoid is energized, and air is directed to the exhaust ports. As "coolant" temperature increases, or system goes to "Closed Loop", the ECM opens the ground circuit, the EAC solenoid is de-energized, and air goes to the air cleaner. If the system is not operating properly, check manifold vacuum signal (10" Hg (34 kPa) at the valve and check the electrical circuit from the solenoid to the ECM.


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

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 diagnostic 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.