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c200 w203 wont start
07-12-2018, 03:54 AM
Post: #1
c200 w203 wont start
Hello friends and family,
i am having some issues with a C200 W203 m271, ISSUES below:
Car was starting normally but developed some idle and throttle issues, so the owner decided to take the car to fix and history of the car was: replaced throttle body, airflow meter, now the car worked normally about one month ago according to owner, but now its in my workshop for the following issues below:

1. car not starting with key, it turns the steering lock, so it functions, ignition comes on no codes on the ezs eis esl, but to crank position iii , nothing happens..no crank.
- so i probed to the starter unit and it cranks and attempts to start,it only idles and stay idle when the intake is blocked by hand...now i scanned and found two codes
P2006-1 B2/5b1 intake air temp sensor, signal short circuit to + (p0113)
p2019-2 K40/4K3 (AIR PUMP RELAY) N10/1k0 short circuit to ground (p0410)

now Im faced with resolving two issues, 1.normal starting and 2.engine idling.

I located the front SAM and Rear SAM, and start with fuse checks and relays , but i would really appreicate some expert advise to resolved this problem maybe a fuse and relay diagram or where this issue may be, not everyday we have a w203 in our workshop, thanks in advance guys!!

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07-12-2018, 03:57 AM
Post: #2
RE: c200 w203 wont start
check starter realy and fuse in front SAM

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 Thanks given by: HestonDiag , Shawnp
07-12-2018, 07:56 AM
Post: #3
c200 w203 wont start
Thanks I Checked F52 fuse and S relay, the fuse is a 15amp and it’s working also the starter relay tried another and same thing.


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07-12-2018, 09:14 AM (This post was last modified: 07-12-2018 09:15 AM by Rocinante.)
Post: #4
RE: c200 w203 wont start
Is the signal to the starter relay coming out of the engine control unit? Do you have a Star Diagnosis system to read the actual values of the engine control unit? Is this a manual or auto trans? Is it recognizing Park/Neutral? Clutch switch?

Don't worry about the idle if you can't get the engine to crank.... Take the diagnostic steps in order... no crank will most likely block the engine running by not turning on the injectors or other means..

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07-12-2018, 11:55 AM (This post was last modified: 07-12-2018 11:55 AM by Shawnp.)
Post: #5
RE: c200 w203 wont start
(07-12-2018 09:14 AM)Rocinante Wrote:  Is the signal to the starter relay coming out of the engine control unit? Do you have a Star Diagnosis system to read the actual values of the engine control unit? Is this a manual or auto trans? Is it recognizing Park/Neutral? Clutch switch?

Don't worry about the idle if you can't get the engine to crank.... Take the diagnostic steps in order... no crank will most likely block the engine running by not turning on the injectors or other means..

thanks for the reply!! yes i have star Diagnostics unfortunately its not working, so i am temporarily resorting to the Maxidas Ds708 ,

The car is auto transmission, ****note it will not come out of park, usually the owner said it was engaging into neutral but now its stuck in P***

yes i understand other relating issues may cause the idle...

can you advise the steps i should take now factoring in the AT neutral switch?
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07-12-2018, 01:52 PM
Post: #6
RE: c200 w203 wont start
If it won't come out of park, you need to check and see if the shifter is failing.. you really need an SDS to check codes and control units that aren't communicating.. there is soooo much involved just to get the starter to turn...

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 Thanks given by: HestonDiag , KriyenKPp , laco210 , leminhautotek , Mercerwin
07-12-2018, 03:42 PM
Post: #7
RE: c200 w203 wont start
Check circ. 15 relays in front Sam. Can we get your Vin please
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07-12-2018, 04:45 PM
Post: #8
RE: c200 w203 wont start
Per your description check if the signal from the Ecu to the starter works
When you open the key. For all you know there is a short some where
Also get a wiring diagram for reference bro. Hopes this helps
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07-13-2018, 04:26 AM
Post: #9
RE: c200 w203 wont start
You want to look at relays P and S


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