No communication between the Sam and the engine ECU

MER-S500

MEMBER
2000 MERCEDES BENZ S500
130,000 MILES

I have no communication between the can and the ECU. There is no check engine light that comes on the car will not turn over to start. I have a euro scanner but it will not link to my vehicle. Thank you for your help!

Sunday, August 26th, 2018 AT 7:15 AM

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
42,878 POSTS

Hello,

The first thing you should do is make sure the scanner works on another car. Next here is the ALDL connector and SAM module wiring diagrams so you can see how it works and to check for power at the connector. Next there is a circuit 15 relay that power the SAM modules that needs to be checked. Here is a guide to help you with that and the wiring diagrams and relay locations to help you get started:

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

and

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken

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