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Siemens MS43 Retrofit MAP Sensor: Difference between revisions

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====Harness Modification====
====Harness Modification====
#asdf
'''Building the Y adapter'''
#Cut one ~20cm and one ~5cm piece of FLRy wire and strip ~4mm of insulation off both ends each
#Splice one of each end together with the other wire
#Crimp a male MQS pin to the spliced end first, as this is the hardest part of the mod
#Once you've done this you can proceed and crimp another male pin to the short wire and a female to the long wire
#Insert both female pins into the housing
 
That


===Building The Harness===
===Building The Harness===


===Sensor Definition===
===Sensor Definition===

Revision as of 23:32, 6 January 2021

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.

As of today, this sensor is for data logging purposes only, but will be used for additional features in the future. For those who still want to reftrofit a MAP sensor we write this article including a list of parts and tools you need.

Requirements

  • Crimp tool
  • 0.5mm² FLRy wire (preferably in three different colors)
  • MQS Quadlock pin female for 0.5-0.75mm² wires(Tyco 963729-1)
  • Bosch MAP sensor 20-300kPA (0261230119)
  • Bosch Compact 1.1a connector housing female (1928403966)
  • Bosch Compact series BDK2.8 pins (0.5-1.0mm² 1928498056-L)
  • Seals for BDK 2.8 pins (1928300599)

A) additionally if you chose to solder inside the ECU

  • Torx 15 screw driver to open MS43 case
  • 0.25W 0-Ohm resistor or a short piece of insulated wire

B) additionally if you chose to re-pin the ECU connector instead of soldering

  • Fine screw driver to remove pin from housing
  • MQS Quadlock connector pair with atleast 2 pins
    • 2 pin male: Tyco 1-1718333-1 & female: Tyco 1-968699-1
    • 3 pin male: Tyco 1-1718346-1 & female: Tyco 1-968700-1
  • another short piece of FLRy 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.

The ECU modification is cleaner and cheaper but involves soldering on the PCB, for the harness mod you have to create a small adapter harness with a set of MQS connectors.

From an electronic point of view both mods are equal and bridge the the existing +5V supply voltage for the pedal value sensor to the MAP sensor: ECU internal - harness external.

If you need additional +5V sources you can also combine both modifications.


ECU Modification

Harness Modification

Building the Y adapter

  1. Cut one ~20cm and one ~5cm piece of FLRy wire and strip ~4mm of insulation off both ends each
  2. Splice one of each end together with the other wire
  3. Crimp a male MQS pin to the spliced end first, as this is the hardest part of the mod
  4. Once you've done this you can proceed and crimp another male pin to the short wire and a female to the long wire
  5. Insert both female pins into the housing

That

Building The Harness

Sensor Definition