Engine Loom
From E30 Zone Wiki
The main engine loom is a crazy snake of wiring independent of the main vehicle Loom. It connects to the main loom via the C101 plug, and connects the engine ancillaries together for the ECU.
This engine loom is the most common version, the Motronic 1.3 loom. If you are converting your engine to an M5x unit, compare this diagram with the M5x loom.
| Number | Function | Pins | Image |
|---|---|---|---|
| 1 | ECU | 
| |
| 2 | Battery + | ||
| 3 | Oxygen sensor | ||
| 4 | Coil - | ||
| 5 | Coil + | ||
| 6 | Ground | ||
| 7 | Starter | ||
| 8 | ICV or TPS | ||
| 9 | ICV or TPS | ||
| 10 | Starter | ||
| 11 | Alternator | ||
| 12 | Alternator | ||
| 13 | Oil level sensor | ||
| 14 | C191 | ||
| 15 | CPS or CID | ||
| 16 | CPS or CID | ||
| 17 | Diagnostic connector | ||
| 18 | Oil Pressure switch | ||
| 19 | C101 | ||
| 20 | AFM | ||
| 21 | Carbon Canister valve | ||
| 22 | Relays |
