Siemens MS43 Retrofit MAP Sensor

Modern engines are almost exclusively equipped with pressure sensors to measure manifold absolute pressure (MAP).

The M5x engines don't have this sensor, that could be very handy when converting the engine to forced induction, or if you simply want to know MAP.

For those who want to reftrofit a MAP sensor we write this article including a list of parts and tools you need.

As of today, this sensor is for data logging purposes only, but will be used for additional features in the future.

Requirements

• Siemens MS43 ECU
• Torx 15 screw driver
• 0.25W 0-Ohm resistor or small piece of wire

Retrofit Additional +5V Output To ECU Plug

To have an additional +5V output available for the MAP (or basically any other) sensor you need to either modify the harness, or the ECU.

ECU modification is cleaner and cheaper but involves soldering on the PCB, for the harness mod you need an additional pair of connectors