ECU

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The ECU is the brain of your E30. It is responsible for controlling all aspects of Engine Management.

Contents

Overview

From the first carburetted M10 engines to the sophisticated M42, all E30s features some form of Engine Control Unit that controlled the Fuel system. Over time the systems became more advanced and incorporated Cold Start, Ignition timing and idle speed. They did this by tapping into a variety of sensors, such as the AFM, CPS, CTS, and TPS.

Based on a fuel map inside the main ECU chip, the system could then control the correct fuelling right across the engine rpm, load and temperature range.

List of ECUs

The following list shows which ECUs were fitted to which vehicles:

ECU Number System Models From/To
0260 200 005 Carburettor 316 1982-
0280 000 318 L-Jetronic 318i 1983 - 84
0280 000 330 L-Jetronic 318i 1984 - 87
0280 001 301 L-Jetronic 320i and 323i 1982 - 84
0280 001 309 L-Jetronic Later 320i
0280 001 308 L-Jetronic Later 323i
0280 000 310 L-Jetronic Late 323i
0261 200 174 Motronic 316i 1988 Onwards
0261 200 157 Motronic 318i 1987 - 88
0261 200 175 Motronic 318iS 1989 onwards
0261 200 152 Motronic 1.1 320i 1987
0261 200 381 Motronic 320i 1987 onwards
0261 200 172 Motronic 320i 1987
0261 200 087 Motronic 320iS
0261 200 073 Motronic 1.0 325i Chrome bumper 1987
0261 200 153 Motronic 1.1 325i Chrome bumper 1987
0261 200 173 Motronic 325i Plastic bumper 9/87 onwards
0261 200 164 Motronic 1.3 325i Auto 9/87 onwards
0261 200 380 Motronic 325i 8/88 onwards
0261 200 071 Motronic Early 195/200bhp M3 and Evo 1
0261 200 090 Motronic M3 Evo II
0261 200 091 Motronic M3 with 215bhp
0261 200 092 Motronic M3 Sport Evo
0261 200 042 Motronic 325e until 9/85
0261 200 154 Motronic 1.1 325e 1987
0261 200 074 Motronic 325e 9/85 onwards (Low compression)

Pinouts

Main article: ECU Pinouts

The ECU for each engine management system is differentiated by the size of its plug. Jetronic systems used a 25-pin system, Motronic 1.0 used a 35-pin system, and Motronic 1.1 and 1.3 used a 55-pin plug. The increasing number of pins demonstrates the increasing complexity of the systems, which is why we've compiled pinout charts, to help you diagnose any of your engine management issues.