Please help me with this one. I'm about to burn it. I have 93 300ce, car was running, but now is a no start. I suspect fuel pump, ovp, fuel pump relay (kickdown relay). I have looked and searched via this forum and many others, but to no avail...When I look at the wiring diagrams from the russian site, none of them match my car...It says I have a mas module, but this car doesn't have that, my 95 has it but not this one. I have tried several years, models, anything I can think of to get a cross reference on wiring... I need to be able to test the ovp, kickdown relay, and fuel pump, but the wiring and pins don't line up. Heres the ovp (000-540-67-45) pin breakdown_
1-Brown
2-Black-White
3-Red-Pink
4-Red-Black/double wire
5-Red
6-Red-Blue/double wire
7-Blank
8-Blank
9-Red-Yellow
Heres the fp (kickdown) relay (003-545-56-05) pin breakdown_
1-Brown
2-Yellow-Green/double wire
3-Blank
4-Blue-White
5-Red-Black/double wire
6-Black-White
7-Blue-Green
8-Blank
9-Blue-Red
10-Red-Blue
11-White-Blue
12-Blank
I'm confused because nothing is lining up, and I don't hear the pump or pumps. Does this car have two pumps like cis-e? Please send me a MB angel to fix this car, or atleast send me in the right direction. The ovp and fp (kickdown) relays are not cheap, and I want to make sure whats wrong before I throw parts at it. Thank You!

ABS light ON ???

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A Dalton

Thanks for the reply, ABS light on when? Yes its on at bulb test/koeo...During cranking I'm not sure. I have read several of your posts, and replys to some threads. I used some of this for trouble shooting but like I said nothings lining up. I have noticed the tach jumping during cranking...What now?

Does the tach jump up to about 3K only once?

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A Dalton

Kinda jiggles around...I cant say for sure if it reaches 3K...I read one post that said the 93 is the last year of the early w124 but with the m104 3.2 24v engine...This is funny because the 93 electrical is different than my 95...What else? Thank you!

No..it is the First year of 104 HFM/SFI

Anyway, look on top of the fuel rail..you will see a test port/with cap...take that cap off and with KO, press the valve stem In with a narrow bladed screwdriver [ use a rag , as there is pressure here] and see if you have pressurized gas at that test port

..or , if you have a FP gauge, hook it there and give me the Bar reading.

Any other way to get wiring diagrams, other than the russian site?...As they are listing the car being cis-e with 3.2 and having a distributor, this is far from my car...

Please do not write/post when I am answering...that makes me drop the schematics to answer and start reloading all over again

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A Dalton

I didn't know you were replying, sorry...It doesn't show you being online. I have used the test port. This is why Im saying fuel related no start. I don't hear the pumps. I have a fp guage, but without the pumps its useless...I tried the shreader(sp) valve earlier today...Does that help?

You can not see me on-line..

OK..............
Take the FP relay [ K27] out [ left side, behind panel , behind battery..]

It has a 40A fuse On Top ..check the fuse ..if OK, then jumper terminals 30/87 of relay plug and see if the FP comes up....KO

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A Dalton

your green dot isn't on... Let me get something straight. The only relays behind the panel are, ovp, 6zyl. KLI/KD (this is the kickdown aka fp relay right?) and a smaller green relay that does have a fuse on top but it is 30a. If the green relay with the fuse is the fp relay, then I have been messing with the "kickdown" relay. This is the one I listed the pin chart above. It does not have a term. 30 to jump. I thought the "kickdown" or kilma relay does ac, and fuel, am I mixed up here?

Kickdown is not FP /K27 relay.
You want the one with the fuse.




I don't have one.

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A Dalton

ok, hang on a sec Im going to get that relay...I have been messing with the wrong one, I feel real smart now lol...

I put this number in fastlane under special order search-0015429619. Is that the relay Im after? I'm reinstalling the batt right now, I had it on a charger, then I will jump the relay and give you an answer. Can you give me about 15-20 min? Thank you sooooo much I hope this works, since I'm on the right relay now lol...

Ok, reinstalled the batt. Jumped 87/30 fuel pumps run. ABS light is on, at bulb test, and during cranking. Tach is jumping up towards 3k more than once (bouncing up and down), however still no start. NOW I'm really confused... I had no fuel before, but now I have fuel (jumped terminals) but no start...What now?