DTC P0411/P1411 Diagnostic Routines

Here are the basic diagnostic routines for the P0411 which should be a good place for you to start, and should allow you to determine if the SAI pump is operating. There are several other steps which I can email you directly if you'd like (a little too large for the list).

HM7 VISUALLY INSPECT ELECTRIC AIR PUMP HOSES

DTC P0411/P1411 indicates Secondary Air not detected. In order to test the pump, it must be capable of driving the HO2S lean.

Note: Some applications have one or two AIR Diverter valves.

Possible causes:

Electric AIR Pump fault.
Hose from Electric AIR Pump blocked.
Hose from Electric AIR Pump leak.
AIR Bypass Solenoid stuck open/closed.
AIR Bypass Solenoid leak/blocked.

Key off.
Visually inspect Electric AIR Pump hoses from the Electric AIR Pump to the AIR Diverter valves.
Inspect air hose for cracks, binding, obstructions, water or ice.

Are Electric AIR Pump hoses OK?

Yes	No
GO to HM8 .	SERVICE by draining all water from hoses or REPLACE damaged parts. COMPLETE PCM Reset to clear DTCs. RERUN Quick Test .

HM8 CHECK ELECTRIC AIR PUMP OPERATION

Key off.
Disconnect air hose from either AIR Diverter valve(s).
WARNING: BEWARE OF MOVING VEHICLE COMPONENTS AND HEAT.
Check air flow at the open hose by placing a hand over the outlet of the hose. Caution must be observed while performing this test.
Key on, engine running.
After a 5-second delay, air will be present between 30-90 seconds.

Is air flow present?

Yes	No
GO to HM15 to check Electric AIR Pump for water contamination.	SERVICE air hose to AIR Diverter valves for leaks or blockage. If OK, GO to HM11 .