Hellen 128 Mercedes¶

Available at rusEFI store

This development board is PnP for Mercedes with the 128 Pin ECU (could be used on M104, M111, M112 and M113 engines; late 90s-early 2000s. confirm your ECU harness)

Hardware features¶

ME 2.0/2.1 pinout
Up to 8 Injectors.
Up to 8 Coils (Low impedance or Smart coils)
On board WBO controller
ETB support
VR Crank and HAll Cam sensor support
1/2 channel Knock input
Factory Engine Sensor input support
CAN communication
Possibility to extend IOs (Inputs/Outputs)
USB connection
SD-CARD logging

Firmware¶

Download Release

Download Nightly

Issue tracking¶

HW related issues

SW related issues

Interactive pinout¶

Interactive Pinout

Schematics rev a iBom rev a

Schematics rev b iBom rev b

Schematics rev c iBom rev c

Test points

Hardware extension/ configuration¶

Ignition jumpers (rev. a, rev. b)¶

Vehicle	F2	F3	F4	F5	F6	F7	F8	F9	F10	F11	F12	F13	F14	F15	F16	F17
Connctor pin (NOT jumper designator!!!)	F4	F5	F6	F7	F9	F10	F11	F12	F13	F14	F16	F17	F18	F19	F20	F21
IGNx signal	IGN5	IGN5	IGN3	IGN3	IGN7	IGN7	IGN8	IGN8	IGN4	IGN4	IGN2	IGN6	IGN6	IGN2	IGN1	IGN1
4 cyl 2 coil	🟡	🟡	🟡	🟡	🟡	🟡	🟡	🟡	✔️	🟡	🟡	🟡	🟡	🟡	✔️	🟡
Other model	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?

🟡 - it doesn't matter, the specified pin is not connected

Coil type	R43	R59	R67	R60	R79	R66	R74	R62	R76	R63	R77	R64	R78	R65	R73	R61
Dumb	❌	✔️	❌	✔️	❌	✔️	❌	✔️	❌	✔️	❌	✔️	❌	✔️	❌	✔️
Smart	✔️	❌	✔️	❌	✔️	❌	✔️	❌	✔️	❌	✔️	❌	✔️	❌	✔️	❌

Supercharger Clutch¶

Guide valid for Rev. B and Rev. C

If you want to control the clutch on a Mercedes supercharger, some hardware modifications are required. The following modifications will result in pin F21 being able to control the supercharger clutch:

F13, F14, F17 must be removed
Find R80 on the back of the ECU. It should be a pair of pads for a resistor. Bridge R80 with solder or connect a 0 Ohm Jumper on R80.
Remove IGBT from Q6
Solder high-current MOSFET (for example VNB14NV04, VNB14NV0413TR) instead on Q6
in TunerStudio use F17 - IGN 6

Rev. A board does not have R80! for this variant, you need to remove the Fuses from the list above and solder a wire instead of placing R80: todo:

Solenoid control¶

By design Rev. A and Rev. B boards are designed to drive the VVT coil. On Rev. C hardware E1, E2, E3 and E4 can all be used as solenoid control. They have the internal diodes needed for protection.

Add extra IO¶

Using the Interactive pinout, Test Points are documented that are connected from the Car connector to the PCB. These can be connected with wires to the Test Points that are available in TunerStudio.

Example:

E17 is Test Point P17 (In some variants this is oil level).
In case we would like to use this as an oil pressure sensor, in Tuner Studio: Sensors > Oil Pressure > Oil Pressure ADC input drop down would display a list where we can see P30_IN_AUX4. By selecting this input, the user needs to connect a wire from P17 to P30.

The end user should keep track of mods, since there is no way for us to do this. Dedicated connections are available in Tuner Studio with Car connecter Pin cod in the name.

todo: add a picture with board/TunerStudio config.

Extension Pads¶

Pin	Type	Comments	Hardware revision
	Outputs
P18	Low side	1.5 A	C
P19	Low side	0.5 A	B, C
P33	Bridge driver B	3 A peak	A, B, C
P34	Low side	0.5 A	A, B, C
P35	Low side	0.5 A	A, B, C
	Inputs
P30	Analog pull up		A, B, C
P31	Analog pull down		A, B, C
P32	Analog pull down		A, B, C
P36	Analog pull down		B, C
P40	Analog pull up		B, C
P41	Analog pull up		B, C
	MCU
J1	SPI, UART/GPIO	See schematic for details	A,B,C

NOTE: the Analog inputs can also be used as switched inputs! These can be configured for example clutch pedal switch or switch for launch control.

rusEFI WBO controller¶

Since a narrow band lambda (O2 sensor) was used in the original ECU, Hellen includes an onboard wideband controller. A harness is needed to connect the lambda sensor, these lines are not possible to wire in to the car connector.

Connection Hellen WBO

Project page rusEFI-Wideband-Controller

Misc¶

Pinout comparison¶

Google Sheet

Another Google Sheet

4 cylinder application (Jimmy M111 2.3 Kompressor setup on 190e)¶

uses E13,E14,E25,E26 for INJECTORS
two IGBT: Q1 & Q3
one MOSFET soldered instead of IBGT for clutch solenoid
E1 with fly-back for boost control solenoid
E3 for supercharger bypass valve

M104¶

three IGBT: Q1, Q3 & Q5

Vault-Of-Mercedes-OEM

Mercedes-C230-and-SLK230

FAQ¶

Would this work on my all original Mercedes?¶

Hellen 128 was originally designed for M111 swaps into W201. Depending on the year some W202, R170 and other models could be driven with different amount of supporting mods:

Somewhere around 99 Mercedes has transitioned from just plain wires on C40 and D3 to CAN-bus starter security. For those later models one would have to simplify starter wiring and add a start button
M112 and M113 are also supported as long as you have those with the matching engine harness!
And obviously your engine harness should use this ME 2.0 style of plug not this 134 pin style of plug.

Transmission Control¶

As of April 2022 we know nothing about m111 automatic transmission control. All successful swaps so far were using manual gearboxes. 722.6 automatic transmission

Changelog¶

rev C¶

wastegate diode
USB type B

rev B Aug 27, 2021¶

better provisions for high-current control of supercharger clutch solenoid on M111 Q6 R80
ignition fuse changed from 36915000000 5A to 2010-T10A0V2T11192AM5G 10A. 0697H9100-02 could be use for refitting of rev A

rev A June 10, 2021¶

good to drive, great success!

Spare Parts¶

ISL9V3040S3S is the large IGBT driver (same thing as ISL9V3040S3ST)

Smaller NGD8201AN or ISL9V3040D3ST could probably be used as well.