Haltech NEXUS S2 (ECU Only) - HT-212000

The Haltech NEXUS S2 (ECU Only) – HT-212000 is a standalone engine management computer built for engines with up to 4 cylinders or up to 2 rotors. It's the successor to Haltech's acclaimed Elite 1500, pairing that platform's proven functionality with the faster processing power and expanded feature set of the Nexus architecture. This is the ECU unit only — ideal for racers, tuners, and engine builders who need serious race-level features and data logging capability in a compact, standalone package.

Key Features & Benefits

• Advanced race features: Launch control, anti-lag, traction control, dual knock control, trans brake control, flat shift control, and a built-in race timer give racers the tools to extract consistent performance.
• Onboard datalogging (128MB) & Wi-Fi: Capture and review runs without external loggers, and connect wirelessly for faster tuning sessions.
• Onboard wideband controller: Supports NTK and LSU 4.9 sensors, simplifying wiring and reducing the need for extra hardware.
• Onboard 4 bar MAP sensor: Built-in boost/vacuum reference for forced induction applications.
• Flexible I/O: 4 peak/hold injector drivers, 4 low current ignition outputs, 6 low side DPO outputs, 4 push-pull/half bridge outputs (8A, PWM capable), 11 x 0-5V analog inputs, and 6 synchronous pulsed inputs cover complex sensor and actuator setups.
• Automatic transmission control: Compatible with Ford AODE/4R70W, GM 4L60E, GM 4L80E, Toyota A340E, and Lenco Liberty transmissions for full powertrain control.
• Controlled via NSP (Nexus Software Programmer): Access long term learning, stepper motor idle control, 4D closed loop boost control, multi-stage fuel injection, and multi-level engine protection from a single tuning suite.

Specifications

• Part Number: HT-212000
• Brand: Haltech
• Weight: approx. 2.90 lbs
• Two 34-pin AMP connectors (Connector A and Connector C)
• 2 x CAN ports with switchable termination

Fitment

The Nexus S2 is designed for engines with up to 4 cylinders or up to 2 rotors, making it suited to a wide range of import and rotary-powered race builds. As a standalone ECU, it requires a matching wire-in harness or terminated engine harness (sold separately) and professional tuning setup — it is not a plug-and-play ECU. If your engine has more than 4 cylinders or you need factory connector plug-in compatibility, look at Haltech's other Nexus or Elite ECU options instead.

What's in the Box

• Nexus S2 ECU
• 4 x mounting bolts
• USB-C cable
• USB-C dust cap
• Quick Start Guide
• Wiring Diagram

Why Buy from ThreePiece.us

ThreePiece.us ships every order free, and our team can help confirm which harness, connector kit, and sensor pack your build needs before you order the Nexus S2. Need to spread out the cost of a serious engine management upgrade? Affirm financing is available at checkout so you can get your build on the dyno sooner.

Frequently Asked Questions

Does this include the wiring harness?
No. This listing is for the Nexus S2 ECU only; the wire-in harness and connector kit are sold separately.

What engines is the Nexus S2 designed for?
It's built for engines with up to 4 cylinders or up to 2 rotors, and is intended for racing applications where advanced features and data logging are required.

Can the Nexus S2 control an automatic transmission?
Yes, it supports automatic transmission control for Ford AODE/4R70W, GM 4L60E, GM 4L80E, Toyota A340E, and Lenco Liberty applications.

Do I need a laptop or special software to tune it?
Yes, the Nexus S2 is configured and tuned through Haltech's NSP (Nexus Software Programmer) software.