Do I have a socket in my early 1985 DME?
How can I find out?

Identify which early 944 DME logic boards is yours. With or without socket. A socket is required to change DME's programming (the chip). "I have an early Porsche 944 (1982 thru 1985.0) and do I need a socket adapter board?" Both versions of the logic board are considered functionally the same. So BOSCH did not give the new version unique part number. They both version have the same external part markings.

The DME part numbers are the same from 1982 to the end of production in mid year 1985. In late 1984/1985, BOSCH made changes to the logic board. The original four ROMs (masked programmable) were replaced by a single EPROM (programmable ROM). This was done to make manufacturing easier and not because BOSCH wanted to make it chipable. Neither BOSCH nor Porsche condone the practice of running non factory chips.

The DME part is the same for both versions of the logic board. The only way to be sure which version you have is to open up the DME and look. Open it up an look.


Procedure: Verify you need an adapter.

1. Take wire harness connector off the DME. Remove DME from under the steering column. 4 screws hold it in place.

2. Remove back cover (4 Phillips screws). The back cover has no label. You may have to put the DME on the ground and lean on the screw driver to break these screws loose.

3. Remove screws (2 Philips and 2 flat head) holding digital board in place. Make a note of screw placement for reassembly. Open the board so that it is face up. 

82 to 84 DME logic board Does your logic board look like this?
Socket adapter board required. Board is not designed for EPROM use

85.0 DME logic board Does your logic board look like this?
No Socket adapter board required. Board is designed for EPROM use. First appeared in the early 1985 model Porsche 944 but can rarely be found in 1982 to 1984 years.