Trying to figure out why I'm getting so many codes, looking at the schematics, I noticed that some of the consumers on the red/blue wire aren't getting voltage. Namely O2 sensors, EVAP, Air Pump atleast that what the codes tell me.

I'm getting a P0410 and the air pump will spin up when external 12V applied.

The car runs much worse after replacing the MAS, I guess at Key On engine off voltage of 2.6 immediately took the car out of closed loop. Hence better running because now it tries to enter closed loop and coughs and sputters.

I remember reading something about the brake light swithc and the red/blue wire, I think, anyone know off hand?

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Someone disconencted the wire harness on the RF floorboard, plugged it back in now the car runs like crap, will start new thread about the running issues.

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did you make any progress on these issues??

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88 W124 3.0
96 R129 119eng
06 ML350
98 ML320 sold
02 CLK55 amg