Haltech Nexus S2 ECU 

High-Performance ECU with Built-In Wideband, MAP Sensor & PDM Control

The Haltech Nexus S2 is a cutting-edge Vehicle Control Unit (VCU) and the powerful successor to the renowned Elite 1500. Built on Haltech’s proven Nexus platform, the S2 delivers significantly improved processing power, faster response times, and expanded I/O—making it the perfect solution for tuners, racers, and performance enthusiasts demanding reliability, flexibility, and all-in-one functionality.

Whether you’re managing a drive-by-wire setup, tuning boost control, or upgrading your EFI system, the Nexus S2 offers all the advanced control features you need—in a compact and rugged package.

✅ Nexus S2 Key Features:

🔧 Advanced Injector & Ignition Control

• 4 x Peak & Hold Injector Drivers (also usable as low-side outputs)

• 4 x Low Current Ignition Outputs (can double as auxiliary outputs)

• 6 x Low-Side PWM Outputs (DPOs for fans, boost control, etc.)

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

📊 High-Speed Input Channels

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

• 6 x Synchronous Pulsed Inputs – supports cam/crank sensors, wheel speed, and frequency signals

• Trigger & Home Inputs – differential inputs with adjustable thresholds and glitch filtering

🌡️ Integrated Sensors & Controllers

• Built-in Wideband O2 Controller – supports Bosch LSU 4.9 and NTK sensors

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

📡 CAN Communication & Integration

• 2 x High-Speed CAN Ports with switchable termination
  (Easily connect to Haltech dashes, PDMs, external sensors, and third-party accessories)

🔄 Other Control Features

• 1 x ECR Output (Engine Control Relay)

💡 Why Choose the Haltech Nexus S2?

• Powerful upgrade from the Elite 1500 with more processing speed and I/O support

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

• Supports advanced tuning strategies, DBW, and CAN communication

• Ideal for 4-cylinder, 6-cylinder, or 2-rotor engines—NA or forced induction

Whether you’re tuning for track, drag, or street performance, the Nexus S2 VCU delivers all the functionality and precision control of a high-end motorsport ECU—at a fraction of the size and complexity.

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 S2 ECU
  
• Mounting Bolts
• USB-C Programming Cable
• USB-C Dust Cap

Info: 

Brand: Haltech 
Model: Nexus S2
Suitable for: Universal 1-4 cylinder or 2 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