Follow this Real Fix to see how code P2433 was diagnosed and corrected on this Subaru Impreza.
Vehicle
2006 Subaru Impreza WRX 2.5
Title
P2433, Replaced Secondary Air Injection Pump
Complaint
The customer states the check engine light is on.
Cause
Connected a scan tool and found code P2433 – Secondary Air Injection System Air Flow/Pressure Sensor Circuit High (Bank 1). Performed a visual inspection of the secondary air injection system and found no obvious faults. Connected a smoke machine to the system, induced smoke to check for leaks, and found that no smoke leaked from the secondary air injection system. Performed a visual inspection of the secondary air injection pump wiring harness and found no obvious faults. With the key on, engine off, used the scan tool to observe the secondary air injection pump parameter and found it did not operate the pump as commanded by the scan tool. Used a multi-meter to check for the presence of power and ground at the secondary air injection pump harness connector and found both battery power and ground were present. Used the multi-meter to test the continuity of the secondary air injection pump wiring harness and found it was operating properly. These test results verified the secondary air injection pump was faulty.
Correction
Replaced the secondary air injection pump, cleared codes, performed a road test and verified the vehicle operated properly. The check engine light did not illuminate and no fault codes returned.