Does this mean that my air pump is not working?

Lately I heard what sounded like something spinning after I started the car and lasted for maybe 15-30 seconds. I changed the oil one day and upon driving the car less than a mile I noticed the check engine light and the scanmaster read DTC 29. Also the fans turn on prematurely but sometimes while stopped the light goes out and the fans turn off but go back on after giving throttle.

THanks

 

29 is set when the pcm detects the wrong voltage on the line to the air pump relay. The first thing to do is unplug c100. Its the black 10pin connector near the pcm. with the key on but engine off, use a meter and measure the voltage on the brown wire. I believe the female side will be the one going to the relay and the male side goes to the pcm. Measure both sides for reference. The pcm will ground the brown wire to close the relay to start the air pump. The female side should measure 12V. Now measure the current from that side to ground. It should measure between .75amp and 0amps. If not, either the wiring or the relay is defective.

Since the fan controls are also in this harness and you have fan problems, I would say you have a short in the harness somewhere.

 

I'll offer you the low tech approach. Sounds like the fuse for the AIR pump might be blown. Common problem, and the fans will come on for DTC 29, so its not likely you also have a fan problem.

Just a stab in the dark, but it might be a good quick first try.

 

Update. I checked the fuse it was blown replaced it twice and both times the fuse blew after maybe a minute or two.

Ok now, I unplugged what I think is C100. The 10 pin connector by the PCM. There are two connectors next to each other one is a 8 pin the other is 10 pin is that C100? But, I have 2 brown wires on the 10 pin connector. One did read voltage but read 12 volts with or without the key in the on position. It was pin E.

Now with the key in the on position I read amperage and I read 0 amps and could here a relay click when I made contact between the pin and ground but could not tell wether it was the air pump relay. I'm assuming it was. I'm going to try and pull the relay and see if I still here the clicks.

Thanks

Edit again. I can also read 0 amps with the key off and the relay clicking is not the air pump relay. I tried the 8 pin conector and got like 4 volts and 0 amps out of the brown wire again Pin E. So something Iam doing is not right maybe someone can show me a pic of C100

 

I think you are over complicating the whole thing. If the fuse blows, either the wiring is too small (subject of a recall on 95 and up) or shorted, or the pump is rusting up (or even siezed), the bearings are shot and its pulling too many amps when it turns on. Fix is to either delete the pump or replace it.

 

Thanks Injuneer,

I have a 95 california car. I think the Air Pump is shot because of the symtoms of it whinning and now I don't here it at all. I wasn't sure how it would make the fuse blow but you explained it for me.

Thanks

 

related problem:

pulled code 84 and 29 today. i thought 29 was due to the SES turning on the fans but it from this thread it sounds like it could be due to my recently installed manual fan switch?

i wired the fanswitch per instructions online and it's been working great so far. could this be a short in my wiring? however, it seems unlikely it would through dtc 84

where is the fuse in charge of 84 and/or 29? perhaps all the battery disconnecting/reconnecting blew the fuse