Chart C-6 Secondary Air Injection (AIR) System Check

Secondary Air Injection System Check:

Secondary Air Pump Circuit.:

CIRCUIT DESCRIPTION
During cold starts, above -8.5°C (17°F), the Powertrain Control Module (PCM) completes the ground circuit to the air pump relay which enables the air pump and integral stop valve. Air is directed to the exhaust ports whenever the engine is started. Whenever the fuel system goes to "Closed Loop," or the air pump has been "ON" for greater than 240 seconds, the PCM opens the ground circuit to the air pump relay, and the air pump is de-energized and the integral stop valve closes.

CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.

1. The PCM should energize the air pump when engine coolant temperature is greater than -8.5°C (17°F) and fuel system not in "Closed Loop." If any Diagnostic Trouble Codes (DTCs) are present the PCM will not energize the AIR pump.
The fuel system must be operating in "Open Loop" to perform this test. If the system goes to "Closed Loop," stop the engine and allow some time to cool down then restart.
2. The PCM should de-energize the air pump relay when engine speed exceeds 2825 RPM.
3. Air pump relay is located in the underhood electrical center.
4. Selecting "Miscellaneous Test" then outputs and then AIR system on the Tech 1 (or equivalent Scan tool) should enable the AIR pump and integral stop valve.
There is a possibility that the AIR pump motor will be operating, but no air is being distributed to the AIR system. A restriction in the AIR hoses or pipes may be the cause or the integral stop valve may not be opening. The integral stop valve is part of the AIR pump.