Haltech Nexus S3 ECU with Universal Wire-in Harness 2.5m

Haltech Nexus S3 ECU with Universal Wire-in Harness 2.5m

The Haltech Nexus S3 (part number HT-213200) replaces the Elite 2500. It keeps everything the Elite 2500 did, adds new features, and runs on the faster Nexus processor. This kit pairs the ECU with Haltech’s 2.5m (8 ft) Universal Wire-in Harness for custom installs, engine swaps and modified street cars.

Please note: this is not a plug and play kit. The harness has ECU connectors on one end and unterminated wires on the other, so it has to be wired to your engine, and the ECU has to be tuned before the engine will run.

🚗 Suitable for:

• Engines up to 8 cylinders, naturally aspirated or turbocharged
• Custom wiring jobs, engine swaps and modified street cars
• Builds running electronic throttle, variable cam control or an automatic gearbox Haltech supports

📦 What’s Included:

• 1x Haltech Nexus S3 ECU
• 1x Haltech Universal Wire-in Harness, 2.5m (8 ft)

🔧 Technical Specifications:

• 8x peak and hold injector drivers
• 8x ignition outputs
• 6x low side drive outputs (DPO), PWM capable
• 4x 8A half bridge outputs, for example to drive an electronic throttle
• 11x 0-5V analog inputs
• 6x synchronised pulsed inputs for cam sensors, frequency inputs or extra 0-5V inputs
• Trigger and home inputs with differential inputs, adjustable thresholds and glitch filters
• 2x knock sensor inputs
• Onboard wideband controller, supports NTK and LSU4.9
• Onboard 4 Bar MAP sensor
• 2x CAN ports with switchable termination
• Up to 300 channels of logging at up to 1kHz, 128MB onboard memory
• USB-C and onboard Wi-Fi, works with the Haltech Connect app

⚙️ Why Choose Haltech:

• 4D closed loop boost control, launch control, anti-lag and traction control
• Long term fuel learning, dual closed loop O2 control and flex fuel
• Dual knock control, up to 4 variable cam control and multi-level engine protection
• Automatic gearbox control for the Toyota A340E, GM 4L60E and 4L80E, Ford AODE/4R70W, Lenco and Liberty
• The harness wires are colour coded and labelled to match Haltech’s wiring diagram, and the quick start guide and NSP software download from Haltech

❓ FAQs:

Q: Will this plug straight into my car?
A: No. The harness is universal. It connects to the ECU at one end and is wired to your engine at the other.

Q: Can you help me wire it in over the phone?
A: We can’t give extended support for DIY wiring. Every build is wired differently, so the Haltech wiring diagram is the reference. Plan for an auto electrician or an experienced installer, and a tuner.

Q: Do I need a separate wideband controller?
A: The S3 has an onboard wideband controller for an NTK or LSU4.9 sensor. A separate CAN wideband such as the Haltech WB1 also works with it.