BMW BCS LPC4 M20 and M30 Motronic 1.3 PNP WIKI V2

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PNPECU BCS LPC M20 and M30 Motronic 1.3 solution

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This page refers to version 2 PNPECU Motronic 1.3 solution only. Make sure to check the adapter tag for your version.

19/06/2023 - Version 5 is latest.

PNPECU has developed the Motronic 1.3 solution to satisfy customer requests to allow the motronic 1.3 engines to be fully controlled

Adapter extra connector information

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• 14 pin Auxiliary connector part numbers
  • Connector - https://www.te.com/usa-en/product-936126-1.html
  • Terminals - https://www.te.com/usa-en/product-5-963716-1.html

• 8 pin Auxiliary connector part numbers
  • Connector - https://www.te.com/usa-en/product-284869-1.html
  • Terminals - https://www.te.com/usa-en/product-5-963716-1.html

Motronic 1.3 OEM Sensors Usage

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• Pre CAT Lambda sensor are not used - but can be wired if needed
• Torque converter clutch active switch - not wired
• AFM is monitored and can be used - usually removed, the adapter harness for new air temp sensor makes it unusable


• AC signals from vehicle - used as OEM
• Automatic torque reduction - used as OEM
• Automatic Park or Neutral - used as OEM
• A/C Compressor active - used as OEM
• Crank sensor - used as OEM
• Narrowband lambda sensor - wired but wideband is suggested for tuning
• Coolant temperature - used as OEM
• Air temp sensor - used as OEM, new air temp sensor usually replaces the oem air temp sensor as it´s fitted inside the AFM.
• TPS sensors - fit M50 TPS, no additional wiring required, if the car is automatic TPS signal for transmission controller must be wired to the adapter, ECU will then use it for TPS same for EML vehicles.
Cyl 6 spark signal - wired as cam signal, can be replaced by a cam sensor.
• Vehicle Speed Sensor Rear Right - used as OEM

Motronic 1.3 OEM Actuator Usage

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• Ignition coil wiring - stock coil supported, wasted spark dumb coils supported.
• Tachometer signal
• Fuel pump relay
• Idle control valve
• Main relay
• Econometer
• Check engine light
• EVAP Valve

CAN BUS Compatibility

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Motronic 1.3 cars never had any CANBUS, the LPC4 CANBUS allows for near endless expansion.

LPC4 has higly versatile CANBUS system, discuss your requirements with PNPECU if you are unsure.

Options at ordering

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Not everyone is going to need or want the same thing with their ECU conversion.

Ignition outputs
• Stock coils - ECU built with ignition drivers



ECU Model
• LPC4 with expansion board: 8 Analog inputs are spare, 2 Digital input are spare, 2 Low side outputs are spare, CAN1 is spare, 2 Injector outputs are spare, 1 coil output is spare.

PNPECU BCS LPC4 w EXPANSION BOARD V2 Adapter pinout

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LPC8 Connector A - 24PIN

Pin number	Function	Information
1	5V SUPPLY
2	ANALOG 0	Spare input 8/2
3	ANALOG 1	Spare input 8/3
4	POWER GROUND
5	ANALOG 4	Spare input 8/5
6	ANALOG 5	Spare input 8/5
7	CAN1 H	Spare 14/8
8	CAN1 L	Spare 14/9
9	OUTPUT 1	TACHO
10	OUTPUT 2	MAIN RELAY
11	POWER GROUND
12	POWER GROUND
13	DIGITAL 1	VSS
14	ANALOG 2	Spare 8/6
15	ANALOG 3	Spare at ECU
16	ANALOG GROUND
17	CAMSYNC	Cylinder 6 HT lead sensor
18	CRANK SYNC	CRANK SHAFT SIGNAL
19	DIGITAL 5	Spare at ECU
20	ANALOG GROUND
21	OUTPUT 4	IAC OPEN
22	OUTPUT 3	Spare at ECU
23	DIGITAL 2	Spare input 14/14
24	12V

LPC8 Connector B - 12PIN

Pin number	Function	Information
1	OUTPUT 5	IAC CLOSE
2	OUTPUT 6	ECONOMETER
3	INJECTOR 1	INJECTORS 1,3,5
4	INJECTOR 2	INJECTOR 2,4,6
5	INJECTOR 3	Spare Injector 14/10
6	INJECTOR 4	Spare Injector 14/11
7	OUTPUT 7	Spare output 14/12
8	OUTPUT 8	Spare output 14/13
9	IGNITION 1	Wasted spark 14/1
10	IGNITION 2	Wasted spark 14/2
11	IGNITION 3	Wasted spark 14/3
12	IGNITION 4	Spare output 14/7

LPC8 Connector C - 14PIN

Pin number	Function	Information
1	COIL 1
2	COIL 2
3	COIL 3
4	12V SWITCHED
5	12V WIDEBAND
6	GND WIDEBAND
7	COIL 4
8	CAN H
9	CAN L
10	INJECTOR 3
11	INJECTOR 4
12	OUTPUT 7
13	OUTPUT 8

AUXILIARY CONNECTOR - 8PIN

Pin number	Function	Information
1	ANALOG 9	TPS FROM TCU
2	ANALOG 0
3	ANALOG 1
4	ANALOG 4
5	ANALOG 5
6	ANALOG 2
7	5V SUPPLY
8	ANALOG GROUND

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Last change 08.04.2024, 08:52:30