Audi A2 Conversion
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On this page we describe the conversion of an Audi A2 1.4i petrol to electric propulsion. We will use the following components:
- Nissan Leaf 24 kWh battery pack with original BMS
- Toyota Prius Gen 2 (2004-2009) transaxle with matching inverter
- openinverter Prius Gen2 motor controller
- openinverter main board running stm32-car (VCU in ECU enclosure)
Pin mapping
We start out by mapping out useful pins of the original wire harness
ECU
The ECU has two connector slots, a smaller one with pins 82-121 and a larger one with pins 1-81. Here we map out pins useful to us VAG wire color codes:
# | orig function | our function | wire color |
---|---|---|---|
1,2 | GND | ||
3 | permanent 12V | ro | |
4 | ignition 12V | ||
5 | Lambda (first) heater | gr | |
28 | From generator (maybe DF) | li/bl | |
64 | Charcoal filter solenoid | bl/ge | |
65 | Fuel pump relay- control | ro/br | |
71 | |||
88 | Injector 3 | sw/li | |
89 | Injector 4 | li/sw | |
96 | Injector 1 | br/bl | |
97 | injector 2 | sw/gn | |