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
# | orig function | our function | wire color |
---|---|---|---|
1,2 | GND | ||
3 | permanent 12V | ro | |
4 | ignition 12V | ro/sw | |
5 | Lambda (first) heater | gr | |
28 | From generator (maybe DF) | li/bl | |
33 | Throttle second pot +5V | gr/ge | |
34 | Throttle second pot (signal) | br/gn | |
35 | Throttle first pot (signal) | ge/bl | |
36 | Throttle first pot +5V | br/ro | |
38 | To cruise control switch * | ws | |
39 | Clutch pedal sensor * if installed | ro/ge | |
40 | To Climate control display | sw/ge | |
41 | To Climate control display | sw/gr | |
43 | To instrument cluster (function unknown) | gn/sw | |
51 | Lambda (first) signal | bl/ws | |
52 | Lambda (first) signal | ge | |
54 | To instrument cluster (function unknown) | bl/ws | |
55 | Brake light switch NC to +12V | ws/ro | |
56 | Brake light switch NO to +12V | ro/sw | |
57 | To cruise control switch * | bl/ro | |
58 | CAN L | or/br | |
60 | CAN H | or/sw | |
63 | Lambda (second) heater | li/ro | |
64 | Charcoal filter solenoid | bl/ge | |
65 | Fuel pump relay- control | ro/br | |
68 | Lambda (second) signal | bl/br | |
69 | Lambda (second) signal | ro/li | |
70 | Lambda (first) signal | bl | |
71 | Lambda (first) signal | sw | |
72 | Throttle second pot GND | gr | |
73 | Throttle first pot GND | ge/li | |
75 | To cruise control switch * | bl/sw | |
76 | To cruise control switch * | sw/ro | |
82 | Engine speed sensor | gr/br | |
83 | Throttle body sens power | ro/gn | |
84 | Throttle body sens 2 | gn/bl | |
85 | Intake manifold Temp/Pressure | gr | |
86 | Hall sender G40 signal | ro/sw | |
87 | Engine speed sensor | gn/sw | |
88 | Injector 3 | sw/li | |
89 | Injector 4 | li/sw | |
91 | Throttle body sens power | ro/bl | |
92 | Throttle body sens 1 | li/ro | |
93 | Coolant temp sensor | gr/ws | |
96 | Injector 1 | br/bl | |
97 | injector 2 | sw/gn | |
98 | +5V wiring to engine bay | gn/li | |
99 | Knock sensor | ws | |
100 | EGR pot | br/li | |
102 | Ignition coil bank 1 | gn/ws | |
103 | Ignition coil bank 2 | gn/ro | |
106 | Knock sensor | br | |
108 | GND for engine sensors | gr/ro | |
109 | Intake manifold Temp/Pressure | bl/gn | |
114 | EGR mot | li/ge | |
117 | Throttle body mot | gn | |
118 | Throttle body mot | br/sw |