Okay, engine off the reader says 98 kpa (about right) for the baro sensor but there is no tag that says 'air sensor'.
There is a tag that says Sec. air and that reads atomspheric.
I ran the secondary air monitor test and here are the results. To me it looks like only test $E2 failed, by about 3 psi. What the heck is test $E2?
If you have no driveability symptoms along with this code, the most likely problem is a software glitch in the ecm programming. There is a technical service bulletin about this concern, basically the fix is to have the dealer reprogram the ecm.
Bulletin No.: 05-06-04-073
Date: December 07, 2005
with Ecotec 2.2L 4-Cylinder Engine (VIN D, F - RPO L61)
Built Prior to VIN Breakpoints shown.
Some customers may comment that the "Check Engine Light" malfunction indicator lamp (MIL) is illuminated. Technicians may find the following DTCs may have set false failures. Typically, the vehicle will exhibit no driveability symptoms, only the MIL with one or more of the above mentioned DTCs.
The following are the DTC descriptors and the description of the false failure concern:
Engineering has identified a concern with the ECM software.
Reprogram the ECM with the latest calibrations if the above concerns are encountered. An updated ECM calibration is now available to address this concern. This calibration, or any that follow, is designed to address this concern
I'd like to exaust the troubleshooting I can do here at home before I bring it to the dealer. I'm not keen on the dealer near me and I said as much in my orignial post.
I have no urge to bring it to the dealer nearby as they have tried to swindle me in the past.
Also since I've had secondary air problems in the past and there is a discrepancy in test E2 I really doubt it's an ECM glitch, though I won't rule it out. To me it looks like the darn thing is reading too much vacuum over what it' is expecting to see.
But, I think we're getting off base a bit. My original post asks;
1. How can I troubleshoot it? (I thought we were working on that pretty well.)
2. Where is the sensor? (By this I meant the Secondary Air Injection System Pressure Sensor)
3. What is the pinout so I can check continuity?
4. What other shadetree trouble shooting suggestions are there?
Sorry for the dealer suggestion. This is just a common problem.
The sensor is located within the air solenoid valve. Here is the schematic.
Here is the connector diagram for the solenoid valve.
Here is the connector diagram for the PCM connector C2