Haltech Nexus S3 ECU 

Advanced ECU Solution with Integrated Wideband, MAP Sensor & Drive-by-Wire Support

The Haltech Nexus S3 is a next-generation Vehicle Control Unit (VCU), designed to replace and outperform the iconic Elite 2500. Built on the powerful Nexus platform, the S3 offers cutting-edge engine management capabilities, combining advanced processing speed, enhanced I/O capacity, and all-in-one integration in a compact, motorsport-ready package.

Perfect for high-performance builds and motorsport applications, the Nexus S3 delivers uncompromising control over fuel, ignition, boost, DBW, and more—making it the ultimate solution for tuners and engine builders demanding reliability and flexibility.

✅ Nexus S3 Key Features:

🔧 Advanced Injector & Ignition Management

• 8 x Peak & Hold Injector Drivers – also usable as low-side outputs

• 8 x Low Current Ignition Outputs – ideal for coil-on-plug or wasted spark systems

• 6 x Low-Side PWM Outputs (DPOs) – control fans, solenoids, valves, etc.

• 4 x Push-Pull / Half-Bridge Outputs (8A) – perfect for electronic throttle control (DBW)

• 1 x Engine Control Relay (ECR) Output

📈 Comprehensive Input Capabilities

• 11 x 0–5V Analog Inputs – with 5V pull-up and DBW redundancy

• 6 x Synchronous Pulsed Inputs – supports crank/cam sensors, wheel speed, frequency, or 0–5V signals

• Trigger & Home Inputs – differential type with configurable thresholds and glitch filtering

🌡️ Built-in Sensors & Monitoring

• Integrated Wideband O2 Controller – compatible with Bosch LSU 4.9 and NTK LZA08-H5 sensors

• Onboard 4-Bar MAP Sensor – supports up to 45 psi (300 kPa) of boost pressure

🔌 CAN Bus Communication

• 2 x High-Speed CAN Ports with switchable termination
  (Seamlessly integrates with Haltech dashes, IO expanders, PDMs, and third-party CAN devices)

💡 Why Choose the Haltech Nexus S3?

• Massive upgrade from the Elite 2500 with double the processing power

• Combines ECU, wideband controller, MAP sensor, and PDM control in one unit

• Compatible with drive-by-wire, boost control, staged injection, and more

• Ideal for 4, 6, or 8-cylinder engines, or 2–4 rotor setups in naturally aspirated or turbocharged applications

• Backed by the powerful NSP tuning software for advanced calibration and monitoring

ECU FUNCTIONS

• Controlled via NSP (Nexus Software Programmer)
• Long Term Learning
• Stepper Motor Control
• 4D Closed Loop Boost Control
• Closed Loop CO2 Control
• Rotational Idle
• Launch Control
• Traction Control
• Anti-Lag
• Dual Knock Control
• Trans Brake Control
• Race Timer
• Multi Stage Fuel Injection
• Multi-level Engine Protection
• 6 Stage Nitrous Control
• 4-sensor variable cam control
• Intake Air Bleed Control
• Flat Shift Control
• Shock Travel & Ride Height Control
• Advanced Torque Management
• On-board Wi-Fi
• On-board datalogging (128MB)

AUTOMATIC TRANSMISSION CONTROL

• Ford AODE/4R70W
• GM 4L60E
• GM 4L80E
• Toyota A340E
• Lenco
• Liberty

What's Included: 

• Nexus S3 ECU
  
• Mounting Bolts
• USB-C Programming Cable
• USB-C Dust Cap

Info: 

Brand: Haltech 
Model: Nexus S3
Suitable for: Universal 1-8 cylinder or 2-4 rotor applications 
Warranty: 12 Months 

Note:

Ideal for racing applications where advanced race features, data logging and power management control is required.

Resources:

• Quickstart Guide
• Wiring Diagram