VW Touran Conversion
I will start loosely collecting infos on the VW Touran from 2004.
Throttle Pedal
The throttle pedal is analog, its signals are put onto the CAN bus by the ECU. I chose to remove the latter so I will have to look into reading the pedal directly. Here is its pin map:
| Pin # | Color code | Function |
|---|---|---|
| 1 | green/white | 5V |
| 2 | yellow/green | 5V |
| 3 | brown/blue | GND |
| 4 | white/blue | Throttle 1 0.75V-4.1V |
| 5 | green/blue | GND |
| 6 | blue/black | Throttle 2 0.38-2.05V |
ECU connector
The ECU is connected to the vehicle with a 94-way connector. I have traced out a few signals.
| Pin # | Color code | Function |
|---|---|---|
| 11 | - | Throttle GND (Pin 5) |
| 12 | Throttle 2 out (Pin 6) | |
| 13 | Throttle 5V (Pin 1) | |
| 33 | Throttle GND (Pin 3) | |
| 34 | Throttle 1 out (Pin 4) | |
| 35 | Throttle 5V (Pin 2) | |
| 31 | Vacuum sensor 5V | |
| 37 | Vacuum sensor GND | |
| 83 | Vaccum sensor signal |
Power steering
The power steering is electric and only draws power when you're actually steering. It still worked after engine and ECU were removed. Winner!
CAN bus
The car has various CAN buses but we only care about the motor CAN bus (500kbit/s). Here are some useful signals I found:
| COB Id | Len | Function | Notes |
|---|---|---|---|
| 0x380 | Byte 2: 0-0xFE throttle position | Produced by ECU, so n/a when removed | |
| 0x1A0 | 1 | Byte 1, Bit 3: Brake pedal switch | Produced by whoever |
| 0x280 | Bytes 2 and 3: RPM*4 | Produced by you, Controls the rpm gauge | |
| 0x480 | 8 | Byte 6, Bit 2: Cruise light, Byte 1, Bit 3: EPC, Bit 4: engine | Controls various indicator lights |
| 0x288 | Byte 1: Temp Gauge 0.75x temp - 48 | Produced by you, Controls temp gauge | |
| 0x38A | Byte 1, Bit 0: Cruise on/off, Bit 1: Disable button, Bit 2: Set-, Bit 3: Set+ | ||
| 0x572 | Byte 0, Bit 3: Key switch in start position |
Faults
After powering up the engine I got two error messages: STOP low coolant and something about an oil sensor. The first can be solved by filling the reservoir with water. The second is probably down to the missing oil level sensor. I will investigate. Update on oil level warning: I fitted a 470 Ohm resistor from pin 1 to pin 3 and the warning is gone