Link G4X MR2Link V3 TST205X ECU

The Link G4X MR2Link V3 TST205X ECU is a direct-fit engine management system designed for Toyota turbocharged 3S-GTE platforms. It installs into the factory ECU enclosure and connects directly to the OEM wiring loom on supported vehicles.

This ECU is intended for manual transmission vehicles only and supports most factory systems while providing advanced tuning capability through the G4X platform.

Important: Manual transmission only. Designed for Gen 3 3S-GTE engines. This ECU does not fit the original ECU housing of non-turbo models. E-throttle requires modification before use. Please confirm your ECU pinout connector matches the header shown in the product images before purchase.

Engine Control Capability

• Designed for Gen 3 3S-GTE engines
• Sequential fuel injection
• Digital triggering using OEM patterns
• Precision closed loop cam control
• Staged injection support
• Knock control with windowing

Hardware and Platform

• Direct plug-in installation using factory ECU enclosure
• Continuous onboard barometric correction
• USB tuning connection
• CAN communication support
• 512 MB onboard data logging

Vehicle Compatibility

• Toyota MR2 (1993 onwards) with Gen 3 3S-GTE engine
• Toyota Celica ST205
• Celica GT-Four RC
• Celica Carlos Sainz Edition
• Group A Rallye models
• Manual transmission only

Exclusions: Not compatible with RedTop BEAMS engines or non-turbo ECU housings.

G4X Plug-In Key Features

• Up to 6D fuel and ignition mapping
• Sequential fuel delivery
• OEM idle control supported
• 5D boost control with three switchable tables
• Launch control, anti lag, and flat shift
• Individual cylinder fuel and ignition correction
• Gear-based fuel, ignition, and boost compensation
• QuickTune automated fuel tuning
• Selectable dual fuel, ignition, and boost maps
• CAN communication support

I/O Expansion

Expansion Connector 1

• GND – Sensor ground
• +5V Out – Low current +5V supply
• DI5 – Digital input
• DI6 – Digital input
• DI4 – Digital input
• Analogue Voltage 7 (0–5V)
• Analogue Voltage 5 (0–5V)
• Analogue Voltage 6 (0–5V)

Expansion Connector 2

• Ign 5 – Ignition auxiliary output
• Ign 6 – Ignition auxiliary output
• Ign 7 – Ignition auxiliary output
• Ign 8 – Ignition auxiliary output
• DI9 – Digital input
• DI10 – Digital input
• Analogue Voltage 8 (0–5V)
• Analogue Voltage 9 (0–5V)

Downloads and Resources

• Installation Manual (PDF)

View all Link ECU Resources