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  #1  
Old 04-24-2002, 08:29 PM
cmahanna
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Unhappy Jump Started C280 yields ASR, limp home mode

Left the dome light on overnight, jump started my wifes '95 C280, and now it looks like i'm gonna drop about $4K. I've got ASR light and limp-home mode. The indy changed the OVR, then started getting codes. He says we might need new DM AND ASR can. He says to have the dealer swap parts till it works. The dealer says that without an appointment, I might get in sometime this year.

Please, techs give me a glimmer of hope!
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  #2  
Old 04-24-2002, 09:38 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Check the fuses under the cover that is on the passenger side of the under hood area.
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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS
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  #3  
Old 04-25-2002, 04:45 AM
David C Klasse's Avatar
CheFrac is Back!
 
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
Check the OVP fuse!! OVP = Overvolt Protection Relay.

Do a SEARCH (top right hand corner of page), and type in OVP... these relays are commonly faulty on this engine. Also many times a jump start can cause them to go bad (or simply blow the fuse).

The part is only about $50 and you can install it yourself in 2 minutes... very easy. You can purchase it on this website (FASTLANE / PARTSSHOP), for a very good deal.

Open the hood of the car:

In the top left part of the picture, there is a panel (just behind coolant reservoir) which covers the car's computer and sensitive electronic equipment. Pull up this panel.

This is a picture under that panel. In the lower right hand corner is labeled OVP in yellow (hard to see). It is a metal relay with a plastic fuse cover on top. Check these fuses first. If your OVP hasn't ever been replaced, I'd replace it without a doubt.
[img]//www.a-p-group.com/cklasse/Ecu.jpg[/img]

Good luck... I hope this will be the solution to your problem. (Also OVP causes NO warm starts... engine turns when engine is warm, but does not start).

Keep us posted!
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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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  #4  
Old 04-25-2002, 08:09 PM
cmahanna
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C280 ASR + Limp + Changed OVP

Benzmac and David, thanks so much for your quick replies! The independent shop changed the overvoltage protection relay and fuse, they said that before the change the computer wouldn't give them codes. From the indy's notes I read that Scantool states EA/CC/ISC control unit is faulty. They then checked wiring harness insulation and found no problems. (i was impressed because i learned from you guys that this could be a problem). The notes also say resistance at DM can (2,200)and ASR can(1,510) are out of spec. Dealer now says he can squeeze me in next wednesday. One can or the other I could swallow, but if I gotta do both, maybe i'll just drive it limp.

95 C280 71K
93 Range Rover Classic 135K
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  #5  
Old 04-26-2002, 07:42 AM
engatwork's Avatar
busy
 
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 11,775
David, good pics - now can you tell me what 1, 2, 3, 4 and 5 are. The 240D and 300D look better everytime I lift this cover onthe E320 .
thanks
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  #6  
Old 04-26-2002, 07:58 AM
David C Klasse's Avatar
CheFrac is Back!
 
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
Oh i forget... I asked what they were one time....

I think one is the ECU, one is the Cruise Control... and I forget what the other is... maybe EFI perhaps!
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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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  #7  
Old 08-13-2002, 02:07 PM
Manuel 300CE
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anyone have similar pictures for a W124 E-class ??

Please post them here, or start another thread.
Thanks
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  #8  
Old 08-13-2002, 08:19 PM
Registered User
 
Join Date: Jan 2002
Location: England
Posts: 1,841
This thread I started shows the OVP on a 190E

The W124 car is very similar to this under the bonnet... only with more space!

Here it is:
Car is pinking, which of these is fuel octane adjuster? (pics)
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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg
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  #9  
Old 08-13-2002, 08:57 PM
Manuel 300CE
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OVP fuse replaced -- all fixed !!

Turns out all that needed replacement is the OVP FUSE -- the OVP relay itself seems fine.

On a 300CE (W124), the OVP is located (along with other electrical controls) in a compartment behind the battery. Its covered by a black plastic shroud -- lift this off to reveal the OVP relay.

Its a beige relay, with a clear flip-up fuse cover.

Picture of the OVP relay below

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