Link ECU
Link G4X TTX Plug-In ECU, Audi TT and VW 1.8T, PQ34 Platform with 121-Pin ECU
$2,913.13
Taxes and shipping shown at checkout. Typical delivery is 3 to 7 business days across Canada.
✓ Confirmed-fit parts — add your vehicle in your Garage to check fitment.
The Link G4X TTX is a plug-in ECU for Volkswagen Group 1.8-litre turbo engines on the PQ34 platform, such as the first-generation Audi TT. It sits in the factory ECU location, takes the factory connectors, runs the factory electronic throttle on its own and adds an onboard MAP sensor. Link has confirmed a short list of cars and engine codes, shown below; other 1.8T models are likely to fit but are not confirmed.
Fits
- Audi TT with the AJQ engine, 1999-2002
- Volkswagen Beetle with the AWU engine, 2005
- Volkswagen Passat 1.8T, 2000
- Volkswagen Golf with the AUM engine, 2001
- Manual transmission only
Before you order
- Manual transmission only.
- Your factory ECU must have two connectors with 121 pins in total.
- The engine must be the 1.8T, and the drivetrain front-wheel drive or Haldex-based 4WD.
- Only the cars and engine codes under Fits are confirmed by Link. Link lists other 1.8T Audi, SEAT, Skoda and Volkswagen models from 1998-2008 (including the Golf, Jetta, New Beetle and Audi A3) as likely compatible but unconfirmed. If your engine code is not listed, contact us before ordering.
- Compare your factory ECU plug with the header photo before ordering.
Highlights
- Built-in electronic throttle control runs the factory drive-by-wire throttle
- Onboard MAP sensor, rated 4 bar or 7 bar depending on board revision
- Reads wheel speeds from the factory CAN network, plus steering data on some models, and keeps a separate CAN/RS232 port for accessories
- Fits the factory ECU location and connectors, with a startup map included
- G4X core features: flex fuel, open and closed-loop boost control, dual closed-loop lambda, VVT control, a built-in trigger oscilloscope and 512 MB of onboard logging
- Motorsport functions: launch control, anti-lag, traction control, nitrous control, cruise control, gear shift and paddle shift control
- USB tuning cable in the box; PCLink tuning software is a free download from Link
Specifications
- Platform: Link G4X
- Communications: 2 CAN bus channels, LTW 6-pin USB tuning connection
- Data logging: 512 MB onboard
- Operating voltage: 6.5-24 V (36 V maximum input)
- Dimensions: 190 x 155 x 40 mm (7.48 x 6.10 x 1.57 in)
- Weight: 960 g (33.86 oz)
- In the box: TTX ECU, anti-static strap, USB tuning cable, Link stickers, plug-in manual card, product registration card
