It can be challenging when your scan tool isn’t communicating with your car as expected. One user ran into this exact issue with their 2002 Audi TT while using VCDS for diagnostics and initially encountered a “CAN: Not Ready” error message. This is a common frustration for DIY mechanics and Audi owners alike.
The problem wasn’t a fault with the scan tool itself, but rather an incorrect chassis selection. For older vehicles like the 2002 Audi TT, it’s crucial to manually specify the correct chassis code in VCDS. This particular model doesn’t utilize a CAN bus for diagnostics, which explains the initial error. Instead, it relies on K-lines for communication.
The solution, provided by an experienced forum member, was straightforward: manually select the ‘8N’ chassis code from the drop-down menu within VCDS before initiating an Auto-Scan. By doing this, the user successfully established communication with the car’s systems.
After successfully running the auto-scan by selecting the 8N chassis, the user retrieved a set of fault codes. These codes provided valuable insights into potential issues:
- 17963 – Charge Pressure: Maximum Limit Exceeded (Intermittent): This fault code (P1555) suggests a potential issue with the turbocharger system, possibly indicating overboost or a related sensor malfunction. Intermittent faults can be tricky to diagnose and may require further investigation into the boost control system.
- 01435 – Brake Pressure Sensor 1 (G201): Electric Circuit Failure (Intermittent): This ABS fault points to a problem with the brake pressure sensor. An intermittent electrical circuit failure could be due to wiring issues, a faulty sensor, or problems within the ABS control module itself.
- Alarm System Faults (01572 & 01374): These faults, “Alarm triggered by Door Contact Switch; Passenger Side” and “Alarm triggered by Terminal 15,” are likely related to recent alarm activations and might be less critical. Resetting these codes could be the first step to see if they reappear.
For anyone working on a 2002 Audi TT or similar era Audi models, remember that manual chassis selection in VCDS is often necessary for successful diagnostics. When faced with fault codes like these, further research and systematic troubleshooting are essential to pinpoint the root cause and implement the correct repair. Online resources, repair manuals, and experienced technicians can be valuable assets in this process.
