Link G4X USDM WRX11X Plug-In ECU, Subaru WRX and STI 2011-2014, WRX STI 2015-2021 (US/Canada)

The USDM WRX11X is Link's G4X plug-in ECU for the WRX and STI sold new in the United States and Canada from 2011, when the North American cars moved to their own ECU pinout. It covers the 2011-2014 GR and GV hatch and sedan and the 2015-2021 VA WRX STI with the EJ257, keeps DCCD, SI-Drive and the factory safety systems working, and ships with a startup map.

Fits

• Subaru WRX and WRX STI, hatch or sedan, GR/GV, 2011-2014, sold new in the US or Canada
• Subaru WRX STI, VA (VAF), EJ257, 2015-2021, sold new in the US or Canada
• Some late 2010 US cars also use this pinout; the B134 check below confirms it

Before you order

• Check plug B134 on your factory ECU harness, positions 1, 2 and 3. Wires present: this USDM WRX11X. No wires: you need the WRX11X (238-4000). Link warns that the wrong unit can damage the ECU and the car.
• 2008-2010 North American cars with the international pinout, including early 2010 builds, take the WRX11X (238-4000).
• Not for the 2015-on WRX with the FA20 direct-injection engine. On the VA, only the EJ257 WRX STI is covered.
• Manual transmission only.
• Known limitations listed by Link: the security or immobiliser lamp can stay lit on some key-start cars with the factory immobiliser, the secondary air pump is not supported, and A/C request and the check engine lamp have been reported not working on some 2013-2014 cars.
• The factory front oxygen sensor is not connected (Link's pinout lists it as unused), so plan on an aftermarket wideband for closed-loop fuel control.
• Link highly recommends an intake air temperature sensor on cars without a factory one.
• Installation: the Link board goes into the factory ECU case, with a rectangular hole cut in the back wall of the case for the USB cable.
• It arrives with a base map that gets the engine started; that is a starting point, not a finished tune. Tuning is done in Link's free PCLink software on a Windows laptop, and the USB tuning cable is in the box.

Highlights

• Keeps factory DCCD, SI-Drive, the MFD with trip computer and gear display, ABS, stability control and hill start assist working.
• Factory CAN data such as wheel speeds, brake pressure, steering angle, handbrake and diff mode is available for logging and control strategies.
• Drives the factory electronic throttle directly, and runs intake and exhaust AVCS on engines that have both.
• Eight injector drives for sequential staged injection on big-power builds.
• 4-pin powered CAN port for a dash, keypad or CAN lambda through Link's CANJST4 cable (101-0198), with a 12 V feed protected by a 3 A self-resetting fuse.
• G4X feature set: flex fuel, open- and closed-loop boost control, launch control, anti-lag, traction control and 512 MB of onboard logging.

Specifications

• Dimensions: 140 x 160 x 30 mm (5.51 x 6.30 x 1.18 in)
• Weight: 240 g (8.47 oz)
• Operating voltage: 6.5-24 V (36 V maximum input)
• Tuning connection: LTW 6-pin USB
• Communications: 2 CAN buses (CAN 1 on a 4-pin powered connector, CAN 2 to the factory network)
• In the box: USDM WRX11X ECU, USB tuning cable, anti-static strap, Link stickers, plug-in manual card and product registration card