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Injection Electronics block diagram 2 (2.5i)

Injection Electronics (2.5i / 325i)

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Scroll to zoom · drag to pan · click a wire to trace its circuit · click a part for its pins · J jumps · L labels

Click a wire to trace its circuit, or a part to see its pins and what they connect to.

Parts on this page 21

Wires 28

Wire	Size	From	To
A/C on input	0.75 mm²	A/C Control Switches ON	Motronic Control Unit 40
A/C switch feed	0.75 mm²	Hot in run only (from unloader relay K7) 87	A/C Control Switches IN
Auxiliary fuel pump	0.75 mm²	Fuel pump junction R	Auxiliary Fuel Pump +
Closed throttle	0.75 mm²	Motronic Control Unit 52	Throttle Switch LL
Coolant temperature	0.75 mm²	Motronic Control Unit 45	Coolant Temperature Sensor 1
DME ground	0.75 mm²	Motronic Control Unit 2	DME ground GND
DME ground	0.75 mm²	Motronic Control Unit 14	DME ground GND
DME ground	0.75 mm²	Motronic Control Unit 24	DME ground GND
DME power input 18	0.75 mm²	Hot at all times B+	Motronic Control Unit 18
DME power input 37	0.75 mm²	Main Relay 87	Motronic Control Unit 37
Fuel pump relay 30	0.75 mm²	Hot at all times B+	Fuel Pump Relay 30
Fuel pump relay coil	0.75 mm²	Hot in run or start 15	Fuel Pump Relay 86
Fuel pump relay control	0.75 mm²	Fuel Pump Relay 85	Motronic Control Unit 3
Fuel pumps	0.75 mm²	Fuel Pump Relay 87	Fuel pump junction T
Main fuel pump	0.75 mm²	Fuel pump junction L	Main Fuel Pump +
Main relay 30	0.75 mm²	Hot at all times B+	Main Relay 30
Main relay coil feed	0.75 mm²	Hot at all times B+	Main Relay 86
Main relay control	0.75 mm²	Main Relay 85	Motronic Control Unit 36
O2 heater	0.75 mm²	Oxygen Sensor Heater Relay 87	Oxygen Sensor 4
O2 heater control	0.75 mm²	Oxygen Sensor Heater Relay 85	Motronic Control Unit 23
O2 heater relay 15	0.75 mm²	Hot in run or start 15	Oxygen Sensor Heater Relay 15
O2 heater relay coil	0.75 mm²	Hot in run or start 15	Oxygen Sensor Heater Relay 86
O2 sensor input	0.75 mm²	Oxygen Sensor 1	Motronic Control Unit 10
O2 sensor input	0.75 mm²	Oxygen Sensor 2	Motronic Control Unit 28
Pump ground	0.75 mm²	Main Fuel Pump -	Main fuel pump ground GND
Pump ground	0.75 mm²	Auxiliary Fuel Pump -	Aux fuel pump ground GND
Throttle switch ground	0.75 mm²	Throttle Switch COM	Throttle switch ground GND
Wide open throttle	0.75 mm²	Motronic Control Unit 53	Throttle Switch VL