2nd dary air not setting redness code. Air pump runing has vaccine to diverter valves. Can here a difference in Air pump when I take off vacume line to diverter valves. Any help trying to get a sticker on this thing.

 

1) Turn off your phone's spell check.
2) There is no 'vacum' here, the secondary air pump provides air pressure to force extra air (and therefore, O2) into the exhaust flow to heat the cats up quicker. You should have considerable air flow, if not, the pump is defective or the check valve(s) at the manifold end are (both?) bad.
3) I do not believe it is likely, but I suppose it is possible that an O2 sensor could be causing the issue, if the O2 sensors do not register the additional O2 content, then the ECM assumes the pump is not running. Seems like it would take more than ONE sensor tho, I'd think that if ONE sensor was off, you'd get a sensor code.
4) Just keep in mind it is a simple system, extra air is injected for about 30 seconds in order to heat the caps up faster. I believe that the only way the ECM knows that things are working is by seeing an increase in O2 by reading the O2 sensor levels. If the ECM does not see a rise in the reading from the O2 sensors soon after turning the pump on, the ECM decides that things are not working, in this case, it either sets the P0401 code or refuses to set the "ready" code:

1. Engine starts, if coolant temperature indicates the car is cold and has not run in some time, go to 2, if not, go to END.
2. Timers A and B start. ECM commands pump to run, additional air (and therefore O2) is introduced into the exhaust stream.
3. Timer B expires in a few seconds - If O2 sensors (I would assume all four) do not register an increase in oxygen level in exhaust flow before timer B expires, go to 6.
4. In cases where O2 sensors DID register the rise, when timer A expires, go to 5.
5. ECM turns pump off, go to END.
6. Set code and/or refuse to set ready code, go to END.
7. END.

The process repeats every time you start the car. Either your pump is not doing it's job, the check valve(s) is/are stuck closed, or something with the ECM system/sensors is making the ECM think that additional O2 is not being injected.


That implies that the valves (or at least one) is stuck closed. But hell, I don't know, there has to be some restriction even when they are open and working fine - so this indication you are hearing may mean nothing. I dont' know, never had to get into it that deeply. My issues have ALWAYS been the pump not running due to fractured solder on the RCM.