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OBD1 E30 Diagnostics demystified

November 24, 2023

Every wondered if you could connect an OBD scanner and get useful data out of the E30?

Most forum posts will say you can only get codes, but that’s just simply not true.

Snap on Ultra with a BM-1B Adapter (EAA0355L74A) and DA-5 OBD 1 adapter cable (EAX0068L01A).

A little older, and less expensive without the ability to graph, but a great unit is the Baum CS2000 with BMW cartridge.

You’ll find that not every unit has the same list of viewable perimeters.

The CS2000 for example provides to view:

Semi-sequential injection is on/off
Ignition timing intervention is on/off
Fuel pump relay is on/off
Tank ventilation is on/off

While the snap on unit provides for:
Idle air controller PWM%

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