Malfunction

giuseppe

Senior Member
Joined
Mar 22, 2009
Messages
659
Reaction score
8
Location
Bournemouth
Your Mercedes
E220Cdi avantgaurde 2001
my alternator/battery is showing a malfunction on the dash, it first came up after I had a check up at jackson`s MB, on the way back from italy,then went away, now yesterday I drove back from St Ives, in the very very wet pouring rain with floods everywhere, and the malfunction has popped again this mourning, I wonder if it has anything to do with a battery I bought from halfords last year, not enough current maybe. Any ideas please, thanks.
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,073
Reaction score
331
Age
86
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
If the battery has 12 volts over the terminals, when off, and 14 volts roughly when running then maybe you were using all of the electrics to the max,, If it starts OK then the battery should be OK,,a simple voltage test is the best thing
 
OP
G

giuseppe

Senior Member
Joined
Mar 22, 2009
Messages
659
Reaction score
8
Location
Bournemouth
Your Mercedes
E220Cdi avantgaurde 2001
  • Thread Starter
  • Thread starter
  • #3
malfucntion

cheers malcolm, I was down your way yesterday, looking up the body work chap, did`nt it rain, you were right,everything was running, i`ll just wait for it to go away again.
 

Miffy

Senior Member
Joined
Sep 6, 2008
Messages
7,356
Reaction score
3
Location
Bromley, London
Your Mercedes
CLK 320 CAB Elegance C208
how does a slipping belt show itself on a merc? could that not be the problem, made worse by excess road spray?
 
OP
G

giuseppe

Senior Member
Joined
Mar 22, 2009
Messages
659
Reaction score
8
Location
Bournemouth
Your Mercedes
E220Cdi avantgaurde 2001
  • Thread Starter
  • Thread starter
  • #5
HI, had the belt replaced when i had the check up, did not fancy risking it , as i was driving to italy.
 

Blakey

Senior Member
Joined
Oct 11, 2007
Messages
295
Reaction score
1
Location
Brighton UK
Your Mercedes
C180 Sport (12) Blueefficiency
My money's on the Halfords battery being underrated. I didn't think they stocked anything up to the mark for most Mercs. What is the car Guiseppe? And what's the battery rating? - There have been a few posts on this in the past.
 

Miffy

Senior Member
Joined
Sep 6, 2008
Messages
7,356
Reaction score
3
Location
Bromley, London
Your Mercedes
CLK 320 CAB Elegance C208
My money's on the Halfords battery being underrated. I didn't think they stocked anything up to the mark for most Mercs. What is the car Guiseppe? And what's the battery rating? - There have been a few posts on this in the past.

would the battery cause a Malfunction error though? My original battery was 110amp but when I needed one fast the best I could get was a kwikfit 88amp. Now I realise that I can not drain as much with the engine off as I should be able to, but its never thrown any errors no matter how much I have powered up.
 
OP
G

giuseppe

Senior Member
Joined
Mar 22, 2009
Messages
659
Reaction score
8
Location
Bournemouth
Your Mercedes
E220Cdi avantgaurde 2001
  • Thread Starter
  • Thread starter
  • #8
My money's on the Halfords battery being underrated. I didn't think they stocked anything up to the mark for most Mercs. What is the car Guiseppe? And what's the battery rating? - There have been a few posts on this in the past.

HI, the car is a 2001 220cdi, I think the battery is a 80 amp joby, you could very well be right, how much is a mercedes one, ????
 

Blakey

Senior Member
Joined
Oct 11, 2007
Messages
295
Reaction score
1
Location
Brighton UK
Your Mercedes
C180 Sport (12) Blueefficiency
Hi Guiseppe, 2001 220cdi - same as me! 80AH is low. I recently replaced mine with a 100AH lump from MB. I nagged them for a discount and got it for about £95. It cured a lot of weird recurring faults.

It's actually the cold cranking amperage rating that is equally important. (Mine is 700CCA I think) The battery voltage drops low when starting, and this low voltage can cause problems with ecus etc. I had quite a few gearbox faults which mostly went away with the right spec battery.

I hope you manage to sort it!

Chris :)
 

Alex Crow

Senior Member
Joined
Jul 9, 2009
Messages
10,677
Reaction score
40
Location
Super Suffolk
Your Mercedes
W169, W124, w202, W203, KTM 250 EXC, VW T25 camper and a Polo in a pear tree
presumably the warning is something like `battery/alternator visit workshop` displayed in red? not likely to be your battery, we have changed front sams and alternators for this fault message in the past. all guesses without fault code/live data/test step analysis.

battery rating would not really come into it as modern alternators are perfectly capable of maintaining charge even at idle with full current draw (ie heater blower, rear demist, head+fog lights, heated seats and whatever else you fancy)


if you have a volt meter connect it to the battery and test at idle with everything on, it should read over 12.8 volts after stabilising, probably over 13. this shows the capability of your alternator to supply all the current needed and still ensure the battery is topped up.

i had a w211 with a new `battery fault` today. it was corroded wiring in the loom beneath the auxilliary battery, stopped the rear BCM actuating the front K57/2 relay. das lead me to `check wiring for breaks etc...` between rear BCM and K57/2 - sweet, can`t imagine life without it! amazing how many wiring faults crop up on the w211s, eg door mirror wiring and boot hinge wiring.
 

Alex Crow

Senior Member
Joined
Jul 9, 2009
Messages
10,677
Reaction score
40
Location
Super Suffolk
Your Mercedes
W169, W124, w202, W203, KTM 250 EXC, VW T25 camper and a Polo in a pear tree
The battery voltage drops low when starting, and this low voltage can cause problems with ecus etc. I had quite a few gearbox faults which mostly went away with the right spec battery.

I hope you manage to sort it!

Chris :)

the low voltage at cold startup from an old battery causes the EGS (gearbox) module to go into emergency program (limits gearchanges). easy to spot from fault codes and age stamp on battery terminal! we have had a lot of these lately. the fault code relates to low voltage at (g.box) solenoid valves.
 
OP
G

giuseppe

Senior Member
Joined
Mar 22, 2009
Messages
659
Reaction score
8
Location
Bournemouth
Your Mercedes
E220Cdi avantgaurde 2001
  • Thread Starter
  • Thread starter
  • #12
Hi Guiseppe, 2001 220cdi - same as me! 80AH is low. I recently replaced mine with a 100AH lump from MB. I nagged them for a discount and got it for about £95. It cured a lot of weird recurring faults.

It's actually the cold cranking amperage rating that is equally important. (Mine is 700CCA I think) The battery voltage drops low when starting, and this low voltage can cause problems with ecus etc. I had quite a few gearbox faults which mostly went away with the right spec battery.

I hope you manage to sort it!

Chris :)

I must have ago at nagging MB for a reduction, if changing the battery deos`nt cure it, it will have to the alternator next, sound expensive.
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,073
Reaction score
331
Age
86
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
Just getting this post in order,,,was this a message or a warning lamp
 
OP
G

giuseppe

Senior Member
Joined
Mar 22, 2009
Messages
659
Reaction score
8
Location
Bournemouth
Your Mercedes
E220Cdi avantgaurde 2001
  • Thread Starter
  • Thread starter
  • #15
presumably the warning is something like `battery/alternator visit workshop` displayed in red? not likely to be your battery, we have changed front sams and alternators for this fault message in the past. all guesses without fault code/live data/test step analysis.

battery rating would not really come into it as modern alternators are perfectly capable of maintaining charge even at idle with full current draw (ie heater blower, rear demist, head+fog lights, heated seats and whatever else you fancy)


if you have a volt meter connect it to the battery and test at idle with everything on, it should read over 12.8 volts after stabilising, probably over 13. this shows the capability of your alternator to supply all the current needed and still ensure the battery is topped up.

i had a w211 with a new `battery fault` today. it was corroded wiring in the loom beneath the auxilliary battery, stopped the rear BCM actuating the front K57/2 relay. das lead me to `check wiring for breaks etc...` between rear BCM and K57/2 - sweet, can`t imagine life without it! amazing how many wiring faults crop up on the w211s, eg door mirror wiring and boot hinge wiring.

did`nt know the car had a auxilliary battery
 


Online parts website for Mercedes:www.partsformercedes-benz.com
Parts for Mercedes-Benz provides a wide choice of OEM (Original Mercedes), quality aftermarket and performance mercedes parts at competitive prices. Our clear, easy to use online store takes the headache out of having to search for that part or accessory you need, with a service that is second to none.
Top Bottom