SLK R170 not cranking - K40 ECU relay replacement
Janne Karppanen Janne Karppanen
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 Published On May 15, 2021

K40 relay that feeds ECU didn't work and car didn't crank because of ECU controlled starter. I moved air pump relay there as kompressor model has no air pump. In this video also instructions how to test K40 with 9 V battery.

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