Bosch DME's explained

So Bosch Motronics DME's there are lots of numbers and my google foo is failing me.

What does numbers mean?

I know like the ME7.x is the ME7 system, but what is the difference in a ME7.01, ME7.1 and ME7.2?

Also the coding is for year and model but there is more there than that.

Here is a list of vehicles with different ECUs

It bothers me when no one on this board knows anything about Bosch DMEs

I know how to re chip them and re solder them and then replace them with a MS.

I work with Bosch stuff all the time. Couldn't tell you anything about them.

Not even which one.

Btw, not because I'm not allowed, because I'm clueless.

Shew. Good thing I only know of the Motorsport 16.x system.... But then again it's a 10 grand system...

I know a few things but nothing that new. Me2.9 was used on distributor vw's from 92 up and the coil cars were in 93.5 with 2.9.1 and me5/9/obd2 starting in 96 for both coil and distro...

For me most of them end up in the trash. Not worth fooling with to get results.

Flight Service wrote: It bothers me when no one on this board knows anything about Bosch DMEs

I know that I'm supposed to keep a spare DME relay in the glove compartment of my old 911. That way, when it fails, I can change it in two minutes without getting of the car. It goes under the driver's seat and they fail without warning. Fortunately, I did just that when mine died and as soon as I got home, I ordered a new spare.

Given their status in the marketplace, this is a little scary

I have a pile of spare DME relays. As a Porsche owner you collect them. I also made up the jumper and keep that in the car as well so I don't have to worry about the spare being bad.

Here are some of the DME types that I am aware of. Keep in mind that in my line of work, I treat the DME as a black box where I want to duplicate the inputs and outputs, and don't really care about the internal workings.

• Motronic 1.0: 35 pin connector, trigger wheel counts flywheel teeth, distributor with ignition module built into DME. Batch fire.
• Motronic 1.1: 55 pin connector, uses 60-2 crank trigger and ignition module built into DME to run a distributor. Batch fire.
• Motronic 1.3: Externally the same as a V1.1; apparently the differences are mostly internal.
• Motronic 1.7: 88 pin connector. Batch fire unit with sequential coil on plug ignition. Some versions support OBD1.
• Motronic 3.1: 88 pin connector. Sequential fire unit with sequential coil on plug ignition. Also has OBD1 support.
• Motronic 3.3: Appears to be similar to 3.1.
• Motronic 4.1: 88 pin connector. Sequential fire unit with OBD2 support. Built by Siemens, possibly under license from Bosch.
• Motronic 5.2: Appears to be an OBD2 version of the 3.1.

In reply to MadScientistMatt:

Any idea where I can find that information for the newer stuff?

specifically the 7.*

Flight Service wrote: It bothers me when no one on this board knows anything about Bosch DMEs

I avoid European cars and their janky BS specifically so I don't have to know stuff like this.

janky? You mean jinky?

On a related note, there is apparently a lot of adult fantasy instructional art associated with Velma from Scoobie Doo and searching for jinkies brought up unexpected results.

Its a big scary internet out there. This is the one safe place. Everybody else is serious weirdos.

7's generally seem to have used a 121 pin connector, were OBD2, and often used a sealed case. These had torque request based drive by wire. VW put them in their rain trays.

The 9 series appeared to be similar but with a 134 pin connector.

In reply to MadScientistMatt:

You know the difference in a 7.1 and a 7.2?

No idea, sorry.