1. on the basis of the stored codes for secondary air system, there is little or no flow of secondary air into the engine. Typical causes of this problem are unsuccessful the secondary pumps for air and/or secondary air check valve. Secondary air pump must operate under normal circumstances, when the vehicle is beginning to test the system. Pump will usually be heard when standing in front of the right corner of the vehicle. 2 secondary air pump is located in the right front of the engine compartment. Secondary air pump relay located in the glove compartment is controlled by the engine control module and sends energy to the secondary air pump. 3. air pump can be turned off with the power and ground at the pump to check the operation is possible.
4. shut-off valve in front of the right cylinder head can be supplied with vacuum and visually checked to open the valve. 5. the Vacuum line from the valve of the solenoid should also be checked for cracks or unplugged. Vacuum line follows the right side of the cylinder head to the rear of the cylinder head on the secondary air solenoid, located under the left rear side of the intake manifold. 6 Solenoid should allow vacuum flow to the valve during the operation of the vacuum pump. Solenoid is controlled directly by the control module and the engine gets power during key on engine off. Potential causes: A.I.R. Check valve engine control module (ECM) codes-engine control module fault. Faulty secondary air pump secondary air pump relay secondary air supply hose broken vacuum line diagnostic codes: P0491 P0492,
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