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'02 SLK32 AMG/'02 SLK230/'03 SLK230
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Discussion Starter · #1 ·
Hi,

I want to know what the signal (waveform) is like on the fuel injector. I also would like to know where the signals originate. Thanks.
 

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*Premium Member
2005 SLK55 AMG /2005 SLK350
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It comes from the Motronic ECU. I haven't put the scope on it, but it's basically a PWM square wave. {edit} The injectors receive constant +12V power when the key is on, and the Motronic opens and closes the ground, generating the square wave pattern.
 
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