¶ TCC Zener mode
The TCC Zener mode is an optional circuit that can be added/enabled on the TCU to mitigate the harshness of the Torque converter clutch via more refined solenoid control (Pulse, hold and fast-off).
This activation proceadure differs based on the variant of the TCU you have.
This is not compatible if you use GPIO Pin 23 of the TCU for an input or output speed sensor
This tutorial covers how to install it.
¶ For 1.3 boards
¶ Items required
- Soldering Iron and solder
- Heat gun (For desoldering) - You might be able to desolder the parts instead
- Wire 27AWG or thicker
- Double sided tape
¶ Steps
¶ 1. Double sided tape installation
Place double sided tape on the rear of the Zener board mount as shown:
The board should now look like this
¶ 2. Desoldering
On the PCB, desolder the following components (Highlighted). You can use a heat gun, or a soldering Iron to do so.
- D22 (LED)
- R25 (Resistor)
- U7 (INA180)
- D11 (Diode)
- Q6 (MOSFET)
This section of the board should look like so after desoldering:
¶ 3. Placing and wiring
Place the TCC Zener board on the PCB like so:
The zener board should now be wired up like so:
| Zener board | Pad (TCU) |
|---|---|
| GND | Right pad of Q6 |
| SOL PWR | Lower pad of D11 |
| TCC IN | EGS connector pin 17 (TCC) |
| PWM | Left pad of Q6 |
| Zener | Middle pin of J1 (Lower jumper) |
Lastly, protect everything with electrical tape to prevent any potential shorts:
¶ 3. Configuration
In the configuration app, under TCU Configuration, simply select the use of the GPIO pin usage to TCC Zener cutoff
¶ For 1.3B boards
¶ Items required
- Knife or Box-cutter
¶ Steps
¶ 1. Jumper switching
Reposition the jumper here from "GPIO Mode" to "TCC Zener mode"
¶ 2. Cutting
Cut the 2 pads as shown here. A box cutter should do the job well enough.
¶ 3. Configuration
In the configuration app, under TCU Configuration, simply select the use of the GPIO pin usage to TCC Zener cutoff