mikekuriger

I have a check engine light, the code is for that air pump on the front of the motor that comes on for 30 seconds when you start the car cold. the pump comes on when I wire 12v to it, so I suspect the relay or fuse is bad. I've searched all over and was unable to find the location on my C55. found it for the E55 but it's not in the same place.

I ended up guessing and found the fuel pump, horn, lights, starter, and a relay that kills the whole ECU. Also found the ABS relay. Still can't find the one for the air pump.

Please help!

thanks,
mike

mikekuriger

geez, nobody knows?

JonMBZ

front fuse box part# 002-542-26-19 look on top of the relay. The air pump always goes bad though, you may need to replace both. Let me know if you need any other help.

mikekuriger

thanks I'll have a look

mikekuriger

That's not the relay for the air pump, it's the SRS airbag relay. I'm looking for the relay on the air pump (smog pump) mounted on the front of the motor. A picture would be helpful.

thanks!

mikekuriger

I found the problem to actually be the large 40 amp fuse. replaced it and good to go!

Chedeng88

Nice to know you figured it out.

Can you post a pic of the fuse and its location? Thanks!

mikekuriger

Well, I thought it was fixed. I guess I'll keep testing every single relay until I find the right one. After replacing the fuxe, my CE light still came on when I did a cold start this morning. I am able to "hot wire" the pump and it comes on fine. I've already tested all the relays in the engine bay so I'll try again.

the 40 amp fuse is the only one in the engine bay fuse box. It's extra large next to a purple relay. I tested the purple relay first, and it seems it's in control of the ABS system.

CFiftyFive

Have you had any luck with this?

Where's is the pump located in the engine bay btw? Can someone upload pics? TIA.

mikekuriger

The pump itself is that large black motor mounted right on the front of the engine. Once I replaced my 40A fuse, the pump started working again. No more c/e light!

JonMBZ

Sorry there is an error in the catalog but it has a note I didn't notice the first time. If that doesn't help let me know again and I will look into it more.