2000 SL2: P0410, No power to air pump

[pdxsl2]

Hello to the Group, Thanks for all the help you folks put out there. I own a 2000 SL2 w/86xxx miles. I had the SES light come on so I went and got a cheap code reader. P0410 and O2 sensor "slow" came up. Replaced the #1 02 sensor and that code went away but the P4010 was still there after a drive, so I started trouble shooting the Air Pump. Cleaned out the tube, check-valve and exhaust manifold, checked all the lines and connections and they were clear and tight.

Checked the circuit from to the pump and no power on start-up. Watched the "how-to" inspection video on Youtube, replaced the ECTS, checked the fuse (OK), replaced the relay, checked/cleaned the "IGN 1/4" fuse (OK), checked the wiring to the pump by removing the top half of the UHJB and sending current to the pump through the relay clips (fan works with direct power). Put everything back together cleared the code and started the engine, still no power to the pump.

As far as I can deduce the PCM is not telling the pump to operate. Does this seem like the problem? Is there another relay or sensor that is involved in making the pump operate? If the Idle Air Control Valve is bad would that prevent the pump from operating? If the PCM is the problem is there a way for a mechanic to put it on a scanner and perform a reprogram or reset so it will operate the pump?

I haven't done a full drive cycle because I don't want to carbon up the O2 sensor. Just want to get that pump working. Thanks for the help in advance

[adventureoflink]

This may give you some ideas:

http://www.obd-codes.com/p0410

note that there was a G.M. TSB for this code...

[pdxsl2]

Originally Posted by adventureoflink

This may give you some ideas:

obd-codes.com/p0410

note that there was a G.M. TSB for this code...

Thanks for the suggestion.

Checked all those areas, no water etc. and the TSB doesn't apply to Saturns, unless I missed something on the .pdf. Does anyone know where I may find a wiring diagram or flow chart showing what sensors are involved with operating the Air Pump? Everything WILL work if power is sent to the pump, there is just no power being sent.

[richpin06]

Have you checked the 30A fuse labeled air pump.Also have you checked that the command signal for the relay from the PCM is working.Remember that signal wire from the PCM is ground so test accordingly.

[pdxsl2]

Originally Posted by richpin06

Have you checked the 30A fuse labeled air pump.Also have you checked that the command signal for the relay from the PCM is working.Remember that signal wire from the PCM is ground so test accordingly.

I have checked the "Air Pump" fuse. How would I check the command signal from the the PCM? Do you have a video posted showing this procedure? Thanks for the help I think that the problem is between the relay and the PCM.

[pdxsl2]

So a quick update. I went with richpin's suggestion and figured out a way to test the Air Pump Relay (used speaker wire to create pigtails that were accessible when the relay was plugged into the UHJB). Sure enough when the PCM is sending power there is no Ground to the Pump. I provided a ground at the Relay and got the Pump to operate (woo! who!). I removed the O2 sensor and when the Pump is on there is no flow out of the O2 hole. I'm now going to try to clean out the Ex. Manifold enough to get air down to the O2 sensorr. This should solve the air flow problem.

Thanks again for all the help and the diagram richpin! I didn't see the diagram on my first reply. I was on my Ipod and the mobile site didn't show the attachment. I'll check the ground indicated on the wiring diagram richpin attached and see if that fixes the problem. Feels like I'm getting close to a solution!!

[pdxsl2]

Originally Posted by richpin06

Have you checked the 30A fuse labeled air pump.Also have you checked that the command signal for the relay from the PCM is working.Remember that signal wire from the PCM is ground so test accordingly.

So I think I have reached a conclusion but I don't understand why this worked. I wound up removing and cleaning the EGR valve, removed the tube from the Air Shut-off & Check Valve to the Ex. Manifold, removed the O2 sensor, flushed everything with Sea Foam, started the motor to blow out the carbon and suddenly the Air Pump fires up at the right time for the right duration. OK.... so I put the ERG back on and fire it up hoping to have air out of the Check Valve. No such luck. Follow the trouble shooting video again and find a Cracked Vac line on the Check Valve. Replaced the line and tried again. Still no air. As I'm getting Vac to the port on the Check Valve I have to assume the Valve is bad so I'll be heading to the Chevy Dealer who is stocking Saturn parts and buy a new one unless someone has a fix for a bad Shut-off & Check Valve. Probably will start a new thread for that one though.

Thanks for all the help and reading the long post. Merry Christmas

[pdxsl2]

Replaced the Shut-off/Check valve and all is well. Thanks for all the help!!!

[eshop]

Hi, I have the exhact same problem, my air (smog) pump does not come on at all, i cleaned all the exhaust ports and tube to manifold, any help is much apreciated? where did you see the video on how to test all the syatem and power source?

[CarsaturnSL2]

I checked the air pump relay and it was good. I checked the selenoid on the air pump and it was good. But the air pump still did not work. Then, I removed the 30A air pump fuse and cleaned the metal part. Then, I reinserted. It worked.

Thanks.