Table of Contents


This part was taken from a Motronic M1.7.3 engine control unit (ECU), which was commonly used on 1.6L & 1.8L 4-cylinder BMWs of the mid-E36 generation. While this chip was likely used on a number of ECUs, the specific one in this case had Bosch PN 0 261 203 661.

Functionally, this chip is a 6-element array of TVS diodes connected in parallel with various analog engine sensors' inputs. It provides bipolar protection to the MCU's ADC inputs.


Label (top):

30132 (Bosch internal PN)
[Bosch Logo]


Decap Steps:
(Bic lighter + water quench) x 2 cycles
Selective crushing with pliers and bench vise

Capture Details:
Imaging device: Keyence VHX-2000
Magnification: 500X

[Bosch Logo]
CJ52B (likely a reference to the commercial PN used by Bosch)

Imaged using normal / center lighting:

Imaged using edge lighting, for enhanced shadow contrast:

Note: The metal layer got a little smudged in some places during mechanical decapsulation. These are ~2X downsampled versions of the original images. Full resolution versions (6-9MB) can be provided. On the to-do list…

felinefriendly/bosch/b30132.txt · Last modified: 2018/07/27 21:55 by e30tuner
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution 4.0 International
Recent changes RSS feed Donate Powered by PHP Valid XHTML 1.0 Valid CSS Driven by DokuWiki