One way to do it just for testing purposes is to ground the diagnostic pin that goes to the computer. It is in the breakout mushroom connector under the hood. If I had an ETM here, I would give you a pin #.

I have done this in the shop for dyno work. It puts the computer into a limp mode so the ASR does not operate.

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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS