Bosch Motronic Ecu Pinout Online

| Pin | Type | Description/Function | | :--- | :--- | :--- | | 1 | A | Fuel pump relay control | | 2 | A | Idle speed control valve - close winding control | | 3 | A | Cylinder 5 fuel injection valve control | | 4 | A | Cylinder 6 fuel injection valve control | | 5 | A | Cylinder 4 fuel injection valve control | | 6 | M | Ground for fuel injection valve output stages | | 7 | A | Camshaft actuator (VANOS) control | | 8 | A | "Check engine" indicator control | | 16 | E | Crankshaft position/RPM sensor signal (+) | | 17 | E | Camshaft position sensor | | 26 | E | Battery voltage (B+) | | 27 | A | Engine control module relay control | | 28 | M | Ground for electronics and shielding of sensors | | 29 | A | Idle speed control valve - opening winding control | | 31 | A | Cylinder 3 fuel injection valve control | | 32 | A | Cylinder 2 fuel injection valve control |

Because the Motronic family spans several decades, these connectors evolved from simple single-plug rows to massive multi-plug high-density connectors. Inside a standard wiring harness, each pin connects to one of four main categories: bosch motronic ecu pinout

Found in late 1980s to early 1990s vehicles (like the BMW E30 or Porsche 944). These typically use a large, single-row or three-row 35-pin or 55-pin yellow/white or black connector. | Pin | Type | Description/Function | |

With the introduction of "ME" (Motronic Electronic Throttle), the pinouts became significantly more crowded [1, 3]. These ECUs often use two large multi-pin connectors (frequently called the "Small Plug" and "Large Plug") totaling 121 pins or more [1, 3]. 3]. Dictates cold-start fueling enrichment.

Dictates cold-start fueling enrichment.