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**Premium Member '02 R170 SLK V8 5.0 & '00 SLK320
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There must be a wiring diagram for this in existence, right?
Apologies, only just seen this ..............

Yes of course there is ;)
 
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**Premium Member '02 R170 SLK V8 5.0 & '00 SLK320
Joined
8,093 Posts
I'd expect it to, or at least another Connector, which then goes somewhere ..................

Without having your VIN Number, looking up Mitchells and WIS Wiring Diagrams, and spending a bunch of time researching it I simply do not know what / where.

I am kinda busy right now, if you haven't got a definitive answer when things here slow down then I'll take a look for you, but hopefully someone else may be able to assist before then ;)

You have presumably paid this Mechanic for telling you all he gets is a number, ask him what that number is, I expect it will be something like, for example, N21/3 or M12/2 etc etc, if you can give me that number it will save a whole load of time, I can look that location / object up and see what it is and where it is on Starfinder .................

What you need if you can't DIY this is someone who knows all this ;)

HTH,
 
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**Registered 1998 SLK230
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72 Posts
Discussion Starter · #44 ·
Thanks, trying to avoid the time and expense of reparing/replacing the ECU, especially considering that I鈥檓 not convinced it is the source of the problem.

Is it even possible that an ECU fault can cause a fuse on the K40 to continually blow?
 

**Premium Member '02 R170 SLK V8 5.0 & '00 SLK320
Joined
8,093 Posts
The only thing I can offer you right now is this ..............

I do not change ECU's very often ................

Despite the fact that in the past year I had at least 10 Cars towed here from other Garages / Mechanics who had told the owner that "The ECU is dud mate" ..................

I fixed all of them, and not one of those Cars needed an ECU to fix it properly ;)

HTH,
 
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**Premium Member '02 R170 SLK V8 5.0 & '00 SLK320
Joined
8,093 Posts
Hi buddy,

In reply to PM,

It's not about money and paypal etc but thank you for the offer ..............

I will give Members here my advice freely, work wise I am currently booked up until the end of March now, and also in deep with my V8 R170 project and there is family visiting plus I have to do a very important trip to middle England in my Van ................

If you get me the "Numbers" that that Mechanic is talking about and tell me what Pin on your K40 that Wire is attached to, plus Wire Colour I will be able to look it up this week during a Coffee or Lunch break, rather than it taking me half a day to download, print and study a wiring diagram, and even then without that info I will not really know what I'm looking for ;)

HTH,
 

**Registered 1998 SLK230
Joined
72 Posts
Discussion Starter · #47 ·
Fault was isolated to the K40鈥檚 connector E, pin 5, black wire with white tracer.
He said the wiring diagram showed that wire going to the numeral 鈥4鈥, and could not find any legend showing what is meant by that.
 

**Premium Member '02 R170 SLK V8 5.0 & '00 SLK320
Joined
8,093 Posts
OK, I'll look that up for you in the next few days, can you either post here or pm your VIN Number please, it will make certain that I get the exact diagram ;)
 

**Registered 1998 SLK230
Joined
72 Posts
Discussion Starter · #49 ·
Thanks!

鈥-But here鈥檚 something weird:

This morning, I disconnected the battery for awhile, replaced the fuse (actually, I was out of them, so I borrowed the fuse for the cigarette lighter), started the car, NO check engine light!
Ran some errands (more fuses, beer, etc.), and car seemed to run fast and fine, check engine light did not appear! Felt as though supercharger was working, though it does not run for a short time when first starting the car (as it should?).
 

**Premium Member '02 R170 SLK V8 5.0 & '00 SLK320
Joined
8,093 Posts
OK, well I got the VIN, I will take a look when I get some spare time ;)
 
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**Registered 1998 SLK230
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72 Posts
s/mod edit: "resolved" has been deleted.

This problem (seemingly solved) but now recurring:

Fuse #2 on the K40 keeps blowing, causing loss of supercharger and other critical functions.

I had 鈥渟olved鈥 this by simply disconnecting the battery, replacing the fuse, and reconnecting battery after 20 minutes or so. Car has run fine since then, but now the fuse blows every time car is restarted after performing the battery reset. In other words, runs fine when started after doing the reset, but blows the fuse the next time car is started, so reset is required again.

A shop had traced the fault to K40 output connector E, terminal 5, a black wire with white tracer, but could not find a wiring diagram showing where that wire goes.

WHERE DOES THAT WIRE GO ???

Any help greatly appreciated.
thanks,
jack
 

**Premium Member '02 R170 SLK V8 5.0 & '00 SLK320
Joined
8,093 Posts
Fuse 2 is Engine Control Relay Output #2 which is one of two Engine Control output feeds ...................

I think the 4 Cylinder cars also use 1 of the 2 for Fuel Pump ;)

Don't completely discount the K40, whilst unlikely in this case, a bad Solder or Relay could cause a low Voltage Output, and when Volts go down in a Circuit, Amps go up, Fuses will blow .................

Ohms Law refers ;)
 
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**Registered 1998 SLK230
Joined
72 Posts
Discussion Starter · #56 ·
Fuse 2 is Engine Control Relay Output #2 which is one of two Engine Control output feeds ...................

I think the 4 Cylinder cars also use 1 of the 2 for Fuel Pump ;)

Don't completely discount the K40, whilst unlikely in this case, a bad Solder or Relay could cause a low Voltage Output, and when Volts go down in a Circuit, Amps go up, Fuses will blow .................

Ohms Law refers ;)
Same problems with replaced K40.
Was hoping that we could shed some light on this by chasing the circuit that was determined to be causing the short: K40鈥榮 output connector E, terminal 5: black wire with white tracer.

Does the fact that the fuse blows the SECOND TIME the car is started after battery reset indicate anything?
 

**Premium Member '02 R170 SLK V8 5.0 & '00 SLK320
Joined
8,093 Posts
1) K40鈥榮 output connector E, terminal 5: black wire with white tracer.

2) Does the fact that the fuse blows the SECOND TIME the car is started after battery reset indicate anything?
(y)

Ahh apologies, I didn't re read the thread, have dealt with so many lately plus busy in the Workshop ;)

1) I don't have the 4 Cyl Wiring diagram, but it def feeds Engine Electronics, exactly which items I don't know ..........

2) Yes it may well do, it could well be a component that is relearning a value, something like the Air Valve, Throttle Butterfly, VVT etc, I know I'm always saying it, but without being there with you I'd really need to see an SDS print out ;)

What you could try is to disconnect various motorised Engine components first 1 at a time and see if you get the second start without the Fuse blowing, when you do that's your component, time consuming, but you are gradually eliminating things, when you are down to the last part, well there we have it ;)

If you or someone else can find the correct wiring Diagram and post it here I'll take a look, see if I can be a bit more specific ;)

HTH a bit ;)
 

**Premium Member '02 R170 SLK V8 5.0 & '00 SLK320
Joined
8,093 Posts
That's all I got too ;)

But V6 (and my V8) uses Black / White for Coil feeds (IIRC might be Black / Yellow lol), Coil feed on the V6 is a separate Fuse in the Main Fuse Box, don't ask me how I know that after a very worring PHUT !! :ROFLMAO:

Again, IIRC, my 2 K40's Engine Relays on the V8 output to Red / Blue Wires (stock V6 set up) ;)
 
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