Bosch M3.3 S50B30 Pinout

BMW S50B30 engine is controlled by seperated control unit for the double VANOS and the Bosch M3.3 for the rest of engine operation. Both control units communicate over CAN bus.

Engine Control Unit

Bosch M3.3 Pinout

Engine Control Unit
Pin	Type	Description
1	Output	Fuel Pump Relay
2	Output	Idle Control Valve (Closing)
3	Output	Injection Valve Cylinder 1
4	Output	Injection Valve Cylinder 3
5	Output	Injection Valve Cylinder 5
6	Ground	Ground Injection Valves
8	Output	Malfunction Inidicator Light
12	Input	O2 Sensor Bank 2
13	Input	O2 Sensor Bank 1
14	Ground	Mass Air Sensor
15	Input	Ignition Circuit Monitoring
16	Input	Crankshaft Sensor +
17	Input	Camshaft Sensor +
19	Output	Secondary Air Pump Relay
23	Output	Ignition Coil Cylinder 5
24	Output	Ignition Coil Cylinder 3
25	Output	Ignition Coil Cylinder 1
26	Input	Voltage Supply Terminal 30
27	Output	Main Relay
28	Ground	Ground Injection Valves
29	Output	Idle Control Valve (Opening)
31	Output	Injection Valve Cylinder 2
32	Output	Injection Valve Cylinder 4
33	Output	Injection Valve Cylinder 6
34	Ground	Ground Other Amplifier
36	Output	Tank Ventilation Valve
37	Output	O2 Sensor Heater Relay
39	Ground	O2 Sensor Bank 2
40	Ground	O2 Sensor Bank 1
41	Input	Mass Air Sensor
42	Input	Vehicle Speed Signal
43	Input	Crankshaft Sensor -
44	Input	Camshaft Sensor -
45	Ground	Ground Ignition Circuit Monitoring
46	Output	Engine Speed Signal
47	Output	Fuel Consumption Signal
48	Output	Air Conditioning Compressor Relay
50	Output	Ignition Coil Cylinder 6
51	Output	Ignition Coil Cylinder 4
52	Output	Ignition Coil Cylinder 2
54	Input	Voltage Supply Main Relay
55	Ground	Ground Ignition
56	Input	Voltage Supply Terminal 15
59	Output	+5V Supply Voltage
60	Input	Programming Voltage
64	Input	Air Conditioning Switch
65	Input	Air Conditioning Compressor
66	Input	Immobilizer
68	Input	Knock Sensor 3
69	Input	Knock Sensor 2
70	Input	Knock Sensor 1
71	Ground	Ground Analog & Knock Sensors
73	Input	Throttle Position Sensor
77	Input	Intake Air Temperature Sensor
78	Input	Engine Temperature Sensor
82	Input	Engine Running Detection
84	Ground	CAN Bus Shielding
85	I/O	CAN Bus Low
86	I/O	CAN Bus High
87	I/O	Diagnostic Link TXD

Vanos Control Unit

M3.3 VANOS Pinout

VANOS Control Unit
Pin	Type	Description
1	Output	Solenoid 1 (Retard)
2	Ground	Ground Load
3	I/O	Diagnostic Link RXD
4	I/O	CAN Bus Low
5	Ground	Ground Electronic
6	Input	Camshaft Sensor Exhaust
8	Input	Voltage Supply Terminal 15
9	Output	Solenoid 2 (Advance)
10	Output	Electronic Cooling Fan Relay
11	I/O	Diagnostic Link TXD
12	I/O	CAN Bus High
13	Input	Voltage Supply Main Relay
14	Input	Camshaft Sensor Intake