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airpump
09-19-2015, 04:21 PM
Post: #1
airpump
I have a 2001 Saturn sc1, 140000 miles. I have a check engine light for the air pump. The 30 amp fuse and the relay both check out OK. I have continuity in the power wire between the relay and the pump. The ground wire at the pump connector also checks out OK. When I connect the pump directly to a 12v battery the pump runs. My problem is the pump does not get power when I start the car. Any help would be appreciated.
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09-20-2015, 12:11 AM
Post: #2
RE: airpump
If the CEL is on then there should be a code in storage to give us more info. The next series of questions will be along the lines of a command for the pump to run or not so we know what the ECM is doing.
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09-23-2015, 10:12 AM
Post: #3
RE: airpump
Thanks for your reply Rupe. While I was waiting for your reply I disconnected all wire plugs and gave them a good cleaning. The pump seemed to work fine and the CE light went out. Thought I was in the clear until the light came back on. Had it checked again and this time it came back as an O2 sensor. Now all I have to do is pin down the car long enough to fix that. My daughter works two jobs and is going to school. Thanks again for your help. Eric
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09-23-2015, 10:30 AM (This post was last modified: 09-23-2015 11:03 AM by Rupe.)
Post: #4
RE: airpump
If you can get the actual code number to us it would be helpful in further diagnosis. What I'm driving at is an O2 code may or may not be a failure of the sensor depending on where the sensor is located (there's more than one) so changing the sensor may not fix anything unless the code was specifically for the sensor's heater circuit, which is internal to the sensor itself. A code for too rich or too lean will indicate the sensor is doing it's job (monitoring) but there is another issue.

Back to your first post, I forgot to mention that an electric air pump does not run full time. If they needed it to do that (like in the old days) it would be belt driven. It only runs when the ECM tells it to run.

Keep us posted on your findings.
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