Results of Incorrect Operation

If no air (oxygen) flow enters the exhaust stream, the start up emission levels will rise. The control module can detect a system flow problem using the pre catalyst HO2S and Short Term FT. If a system flow problem is present the HO2S voltage will not indicate an expected lean condition, Short Term FT will not increase and a DTC will set.

If incorrect voltage is present on the vacuum control solenoid or the pump relay control circuits the device will not operate. This will be detected by the control module and a (DTC) will set.

The following DTCs can set if a secondary air injection fault is detected:
^ P0410 - A system flow problem has been detected.
^ P0418 - A pump relay control circuit problem has been detected.
^ P1415 - A Bank 1 flow problem has been detected.
^ P1416 - A Bank 2 flow problem has been detected.