hey just looking at your pictures its easy to see wires beneath your braiding that look chaffed and possibly shorting. cut open the braiding from the firewall to the front of the engine and start looking at what you got. the backpressure sensor (the ebp) it a frequent problem. btw what year is your vehicle again. what dennis said about mbenz wiring is giving them the benefit. i give them a D.Just sent you a PM
For reference I just went out and manually checked every connection for the MAF MAP and EBP (First is connector : second is ECM)
MAP 1:8 2:85 3:42
MAF 1:GND 2:36 3:92 4:66
EBP 1:81 2:9 3:18
**these are not what is shown in the above linked wiring info
All seem to show good continuity.