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MembersPage/Raigo (2008-10-14 13:18:40)

Hi.

I'm from Estonia. I have an audi S2 Avant from 1994. The engine is ABY. The goal is to use VEMS 3.3 to fully drive the engine for everyday use and for some racing.

Currently the car has:

Done to this far:

The firmware is upgraded to 1.1.27beta5 using 16x14 maps.

Because the VEMS was ordered with standard connectors i had 2 choises. Use the default VEMS connectors and rebuild the car electric system or assemble the VEMS with original 55pin Motronic connector. Because i had one old audi equ this part wasnt hard. Below is the table i used to connect the wires. Note, that the WBO2 and 1-Wire cables are connected to free pins in Audi equ. The power for WBO2 is taken from Motronic connector pin 37.

Pin Function / Assignment Input or Output wrt ECU Schematic References Wire Colour at ECU  VEMS Pin
1 Power output stage for ignition, cylinder #3 OUTPUT N122 pin I3 gn/ws 2 EC36-34
2 Power output stage for ignition, cylinder #2 OUTPUT N122 pin I2 li 2 EC36-33
3 Fuel Pump Relay, 0V. Also provides 12V power for various components. OUTPUT (0V) J17 br/gn 2 EC36-17
4 Idle Air Control Valve, 0V OUTPUT (0V) N71 pin 2 gn/sw 2 EC36-6
5 Evaporative emissions frequency valve, 0V OUTPUT (0V) N80 pin 1 ws - -
6 Air conditioning compressor control. Normally an input in conjuction with pin 41 , but can also be used to turn off A/C compressor when maximum engine power is required INPUT / OUTPUT A/C gn/sw ? -
7 Mass Air Flow (MAF) sensor signal INPUT G70 pin 3 sw/ws - -
8 Camshaft Position Sensor (Hall Sender), Pin #2 INPUT G40 pin 2 gn 2 EC36-13
9 Barometric pressure sensor INPUT F96 pin 1 gr - -
10 0V ground/shield for various sensors 0V G39, G70, G4, G28, G61, G66, F60, G40 br/ge - -
11 Knock sensor I (For cylinders 1 - 3) INPUT G61 ws 2 KNOCK1
12 +5V reference voltage for various sensors OUTPUT G69 pin 1, G40 pin 1, F96 pin2 ro/sw 2 EC36-28
13 OBD connector (L-wire) INPUT OBD ws/ro - -
14 0V ground 0V - br/ro 2 EC36-5
15 Default FREE - WBO2 (NERST CELL SIGNAL) pin-1 - - - 2 EC18-13
16 Fuel injector -ve pulse, cylinder #5 OUTPUT N83 pin 2 br/ro 2 EC36-9
17 Fuel injector -ve pulse, cylinder #2 OUTPUT N31 pin 2 br/bl 2 EC36-19
18 Permanent 12V supply voltage 12V INPUT S27 ro/ws - Flyback
19 0V ground/shield for various sensors 0V G39, G70, G4, G28, G61, G66, F60, G40 br/ge 2 EC36-26
20 Power output stage for ignition, cylinder #4 OUTPUT N127 pin I3 ro/sw 2 EC36-36
21 Power output stage for ignition, cylinder #5 OUTPUT N127 pin I2 gn 2 EC36-11
22 OBD for Malfunction Indicator Lamp (MIL) - Blink Codes OUTPUT OBD gr/br   -
23 Power output stage for ignition, cylinder #1 OUTPUT N122 pin I1 sw/bl 2 EC36-35
24 0V ground 0V - br/ro 2 EC36-32
25 Mass Air Flow (MAF) sensor, burn-off signal OUTPUT G70 pin 4 bl/li - -
26 Mass Air Flow (MAF) sensor, electrical ground INPUT G70 pin 2 sw/gn - -
27 Switched 12V supply voltage (Ignition ON) 12V INPUT S32 sw 2 EC36-25
28 Oxygen / Lambda sensor INPUT G39 gn 2 EC18-13
29 Knock sensor I (For cylinders 4, 5) INPUT G66 gn 2 KNOCK2
30 0V ground 0V G61, G66. G69, F96, G62, G42 sw/li 2 GND, near JP20
31 Fuel consumption signal OUTPUT J128/189 br/sw - -
32 Charge pressure signal (NOT used on the S2) OUTPUT - - - -
33 Wastegate frequency valve control signal (Switched 0V) OUTPUT N75 pin 2 gn/ge 2 EC36-18
34 Fuel injector -ve pulse, cylinder #3 OUTPUT N32 pin 2 br/gn 2 EC36-8
35 Fuel injector -ve pulse, cylinder #4 OUTPUT N33 pin 2 br/ws 2 EC36-20
36 Fuel injector -ve pulse, cylinder #1 OUTPUT N30 pin 2 br/sw 2 EC36-7
37 Switched 12V supply voltage (via fuel pump relay - activated by ECU). Also related to 'holdover relay' with ECU for the MAF. Probably for burnoff - assuming that pin 25 burnoff trigger is a 0V output pulse. In which case this pin is pulled to 12V with the engine running and is used to empower the MAF burnoff sequence with the engine off. 12V N30, N31, N32, N33, N83, G70 bl/sw 2 WBO2- Power
38 Coding Plug (where applicable) INPUT - br/bl - -
39 Coding Plug (where applicable) INPUT - ws/sw - -
40 Engine speed signal (RPM) OUTPUT G5 (Tacho) li 2 EC36-16
41 Air conditioning status - informs the ECU if A/C is ON or OFF INPUT A/C sw/ge 2 JP11-CH7
42 Default FREE - WBO2 (PUMP+) pin-6 - - - 2 EC18-9
43 Default FREE - WBO2 (PUMP-) pin-5 - - - 2 EC18-7
44 Intake air temperature INPUT G42 sw/ge 2 EC36-2
45 Coolant temperature INPUT G62 ro/gn 2 EC36-14
46 Multi-Function Thermal Switch INPUT F76 pin 2 (R) bl/ws - -
47 Crankshaft reference position sensor (62 degrees BTDC on cylinder #1) INPUT G4 ro 2 VR2 Inp, JP20-Pin1
48 0V reference for crankshaft sensors. 0V G4, G28 li-G4, gr-G28 2 GND, JP20-Pin2
49 Crankshaft speed sensor (135 teeth on flywheel starter ring) INPUT G28 bl 2 EC36-27
50 Vehicle speed signal (VSS from speedometer) INPUT G21 ws/bl - -
51 Default FREE - 1-Wire XXX - - - 1 WIRE EC18-16
52 Throttle position switch (Idle detection) INPUT F60 pin 6 gn/li - -
53 Throttle position potentiometer (Throttle angle) INPUT G69 pin 3 gn/bl 2 EC36-1
54 Default FREE - WBO2 (HEATER) pin-4 - - - 2 EC18-18
55 OBD connector (K-wire) INPUT / OUTPUT OBD gn/ro - -

I have made separate board with 2 x SN754410 stepper drivers to drive the ignition directly from standard outputs. The board is connected to top of the Genboard to the pinholes for ignition transistors. This way i can drive the audi ignition amplifiers from VEMS ignitoin channels.

The trigger is default Auditrigger. From InputTrigger/AudiTrigger

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