No crank no start

ELIJAHADEGAHI

MEMBER
2004 MERCEDES BENZ E500
4.0L
V8
2WD
5,372,622 MILES

Please can you tell me or show me how to fix my fault? I drove my car without fan and my temperature went over 109% and it was working perfectly when I switch it off and try to start it won't start anymore. Check all the fuses and they are all working fine. I discovered that my park light won't come on. When I tried to diagnosed the ECM/ESP/EPS is showing me communication error none of the modules are communicating. Please and I don't know what to do anymore.

Wednesday, November 25th, 2020 AT 6:18 AM

1 Reply

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Hi,

I'm not sure if it overheated, but that shouldn't have caused the park light or communication error.

When you say the park light won't come on, are you referring to the shift light indicator? When you try to start it, does the starter engage and turn the engine or does the starter not do anything?

Also, when you try to communicate with the vehicle's computer, does the scan too indicate there is power to it?

____________________

Do me a favor. I attached a portion of the starting system wiring schematic. Check the fuses I highlighted and the relays in the pic as well.

In addition to checking fuses, confirm there is power to them. Here is a link that shows how to check a relay and one dealing with fuses that you may find helpful:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Also, if it is the gear indicator that doesn't light, if you place it in neutral does it light? If it does, see if it starts in neutral.

Pics 2 and 3 show fuse location.

Let me know what you find.

Joe

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