BMW M52 MaxxECU Race PNPECU Wiki V4

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PNPECU MaxxECU M52 MS41 solution

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This page refers to version 4 PNPECU M52 solution only. Make sure to check the adapter tag for your version.
This is not compatible with 320i Siemens ECUs which have different wiring, please contact us if you want such an adapter.

02/09/2023 - Version 4 is latest.

PNPECU has developed the M52 solution to satisfy customer requests to allow the M52 engine to be fully controlled

Adapter extra connector information

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• 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


• 14 Pin Injector loom 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

Transmission compatibility

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This is a complicated subject as at the time of writing there are solutions for external control of DCT, 6HP and 8HP transmissions out of BMWs, at the same time MaxxECU provides it´s standardized can bus output which multiple transmission controllers are able to make use of for just about any transmission out there.

There is no direct support for the original 4HP/6HP BMW TCU and is very unlikely it will ever exist.

For direct PNP communications with a stock BMW DCT transmission with a BMW TCU refer to this page - https://www.maxxecu.com/webhelp/advanced-bmw_dct.html

what this means is that the BMW TCU believes it´s listening and talking to an OEM BMW DME.
The MaxxECU is not directly controlling the transmission but sending and receiving signals that emulate the BMW DME.

MaxxECU is working on adding other BMW newer transmissions to the emulation compatibility list.

100% compatible with all manual gearboxes!

M52 OEM Sensors Usage

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• MAF is not used
• Lambda sensors are not used
• Air temp sensor is not used - new fast sensor is supplied
• Camshaft sensor is not compatible - recommended is to fit a M54 sensor - not crucial for normal operation, vanos still works.


• Coolant temperature - used as OEM
• TPS sensor - used as OEM
• Vehicle Speed Sensor Rear Right - used for vehicle speed
• AC signals from vehicle - used as OEM
• Knock sensors - used as OEM

M52 OEM Actuator Usage

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• Ignition coil wiring - see options below for more details
• Tachometer signal
• Fuel pump relay
• Idle control valve
• Vanos advance
• Check engine indicator
• AC Compressor relay
• Fuel consumption output

CAN BUS Compatibility

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The E36/E34/E38 the M52 originally came in did not communicate with the rest of the vehicle via CAN BUS. However, thanks to the MaxxECU it is possible to fit the engine into other BMWs that require information via CAN BUS

5/11/2022 -
• E46 - compatible with BMWs of similar vintage
• E39 - compatible with BMWs of similar vintage
• E9x - compatible with BMWs of similar vintage

MaxxECU provides OEM BMW CAN BUS output for the above BMW vehicles. It also supports a vast array of other cars which a M52 can be fitted to thanks to that. Refer to this webpage for latest options and relevant information - https://maxxecu.com/webhelp/can-oem.html

Options at ordering

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

Ignition outputs
• Smart coils - IGBT box is set to smart coils - Customer will rewire smart coils into standard ignition wiring
• Stock coils can be retained - IGBT box is set to dump coils

ECU Model
• Race - All EGT inputs are spare, 8 Analog inputs are spare, 1 Digital input is spare, 3 Low side outputs are spare, 1 High side output is spare, 2 Logic level outputs are available, 2 H-bridges are available


MaxxECU DCT Adapter loom
This is a selectable option so that the webstore doesn´t incorrectly calculate shipping cost

EGT Sensor
This is a selectable option so that the webstore doesn´t incorrectly calculate shipping cost

• Single is for when you are planning to monitor pre turbine inlet temperature
• Dual is for when you are planning to monitor pre turbine inlet temperature on a twin setup or each side of the engine
• Six is for when you are planning to monitor individual cylinder temperatures

Injector
This is a selectable option so that the webstore doesn´t incorrectly calculate shipping cost

Race adapter pinout information

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Below is the pin functions of the M52 V3 adapter. The ignition option dictates if the Molex connector is in the adapter or not.

Race Connector 1 - 48pin

Pin number	Function	Information
A1	GPO 5	IAC CLOSE
A2	IGN 1
A3	IGN 2
A4	GPO 8 / Tacho output
B1	GPO 6	VANOS
B2	IGN 3
B3	IGN 4
B4	GPO 1	FUEL PUMP RELAY
C1	GPO 7	Spare output
C2	IGN 5
C3	IGN 6
C4	GPO 2	Spare output
D1	WBO2 Heater
D2	IGN 7	Spare output 0/5v
D3	IGN 8	Spare output 0/5v
D4	GPO 3	IAC OPEN
E1	CAN High	Spare
E2	CAN Low	Spare
E3	GND Shield
E4	GPO 4	AC CLUTCH RELAY
F1	Coolant temp input
F2	Air temp input
F3	WBO2 VREF
F4	WBO2 VS
G1	5V Supply output
G2	TPS
G3	WBO2 IP
G4	WBO2 RCAL
H1	Sensor GND
H2	Trigger GND
H3	Trigger
H4	Home
J1	AIN 1	Spare input
J2	AIN 2	Spare input
J3	AIN 3	Spare input
J4	AIN 4	Spare input
K1	INJ 1
K2	INJ 2
K3	DIN/VR 1	Spare Digital input
K4	DIN/VR 2	VSS
L1	INJ 8	Spare output
L2	INJ 7	CHECK ENGINE LIGHT
L3	INJ 6
L4	Power GND
M1	INJ 3
M2	INJ 4
M3	INJ 5
M4	12V

Race Connector 2 - 32pin

Pin number	Function	Information
A1	EGT 5+
A2	EGT 6+
A3	EGT 7+
A4	EGT 8+
B1	EGT 5-
B2	EGT 6-
B3	EGT 7-
B4	EGT 8-
C1	EGT 1+
C2	EGT 2+
C3	EGT 3+
C4	EGT 4+
D1	EGT 1-
D2	EGT 2-
D3	EGT 3-
D4	EGT 4-
E1	Knock GND
E2	Knock 1
E3	Knock 2
E4	AIN 6	Spare input
F1	AIN 7	Spare input
F2	AIN 8	Spare input
F3	DIN/VR 4	AC REQUEST
F4	DIN/VR 5	AC PRESSURE SWITCH
G1	GPO 15	FUEL CONSUMPTION OUTPUT
G2	GPO 16	Spare output
G3	AIN 5	Spare input
G4	Power GND
H1	GPO 14	Spare output
H2	GPO 11	Spare output
H3	GPO 13	Spare output
H4	GPO 12	Spare output

Auxiliary connector - 14pin without ignition Box

Pin number	Function	Information
1	12V SUPPLY
2	5V SUPPLY
3	POWER GROUND
4	ANALOG GROUND
5	CAN HIGH
6	CAN LOW
7	DIN 1
8	ANALOG IN 1
9	ANALOG IN 2
10	ANALOG IN 3
11	ANALOG IN 4
12	GPO 7
13	GPO 2
14	INJ8

Auxiliary connector - 8pin

Pin number	Function	Information
1	DBW+	GPO 11
2	DBW-	GPO 12
3	ANALAOG IN 5
4	ANALAOG IN 6
5	ANALAOG IN 7
6	ANALAOG IN 8
7	5V
8	ANALOG GROUND

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Last change 08.04.2024, 08:52:39