need help finding relay/fuse for air pump

mikekuriger · 02-16-2012, 02:58 PM

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

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mikekuriger · 02-18-2012, 09:19 PM

geez, nobody knows?

JonMBZ · 02-18-2012, 11:53 PM

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 · 02-20-2012, 03:13 PM

thanks I'll have a look

mikekuriger · 02-20-2012, 03:29 PM

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 · 02-20-2012, 10:32 PM

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

Chedeng88 · 02-21-2012, 11:41 AM

Nice to know you figured it out.

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

mikekuriger · 02-21-2012, 12:39 PM

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 · 03-06-2012, 04:03 PM

Have you had any luck with this?

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

mikekuriger · 03-07-2012, 12:24 PM

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 · 03-08-2012, 11:59 PM

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.

02-18-2012, 09:19 PM	#2
mikekuriger Super Member Garage is empty, add now Join Date: Jun 2008 Posts: 813 Drives: c55	geez, nobody knows? __________________ Mike 2005 C55 AMG tuned by OE tuning, 180,000 + miles

02-18-2012, 11:53 PM	#3
JonMBZ MBWorld Fanatic! Garage is empty, add now Join Date: Jun 2006 Location: California Posts: 2,065 Drives: 06 C55, 09 E350	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. __________________ Resonator + Rear Cats Deleted

02-20-2012, 03:13 PM	#4
mikekuriger Super Member Garage is empty, add now Join Date: Jun 2008 Posts: 813 Drives: c55	thanks I'll have a look __________________ Mike 2005 C55 AMG tuned by OE tuning, 180,000 + miles

02-20-2012, 03:29 PM	#5
mikekuriger Super Member Garage is empty, add now Join Date: Jun 2008 Posts: 813 Drives: c55	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! __________________ Mike 2005 C55 AMG tuned by OE tuning, 180,000 + miles

02-20-2012, 10:32 PM	#6
mikekuriger Super Member Garage is empty, add now Join Date: Jun 2008 Posts: 813 Drives: c55	I found the problem to actually be the large 40 amp fuse. replaced it and good to go! __________________ Mike 2005 C55 AMG tuned by OE tuning, 180,000 + miles

02-21-2012, 11:41 AM	#7
Chedeng88 Senior Member Garage is empty, add now Join Date: May 2011 Posts: 345 Drives: C55 AMG	Nice to know you figured it out. Can you post a pic of the fuse and its location? Thanks! __________________

02-21-2012, 12:39 PM	#8
mikekuriger Super Member Garage is empty, add now Join Date: Jun 2008 Posts: 813 Drives: c55	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. __________________ Mike 2005 C55 AMG tuned by OE tuning, 180,000 + miles

03-06-2012, 04:03 PM	#9
CFiftyFive Member Garage is empty, add now Join Date: Apr 2011 Posts: 87 Drives: E55 AMG, Hummer H2	Have you had any luck with this? Where's is the pump located in the engine bay btw? Can someone upload pics? TIA.

03-07-2012, 12:24 PM	#10
mikekuriger Super Member Garage is empty, add now Join Date: Jun 2008 Posts: 813 Drives: c55	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! __________________ Mike 2005 C55 AMG tuned by OE tuning, 180,000 + miles

03-08-2012, 11:59 PM	#11
JonMBZ MBWorld Fanatic! Garage is empty, add now Join Date: Jun 2006 Location: California Posts: 2,065 Drives: 06 C55, 09 E350	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. Attached Thumbnails __________________ Resonator + Rear Cats Deleted Last edited by JonMBZ; 03-09-2012 at 12:31 AM.

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