Haltech NEXUS Rebel LS Engine Management System — Gen III

Haltech NEXUS Rebel LS Gen III ECU and Terminated Harness Kit

Part Number: HT-220201

The Haltech NEXUS Rebel LS is a complete engine-management and terminated-harness package developed specifically for Gen III GM LS swaps.

The Rebel LS combines the ECU, power management, wideband controller, onboard data logging, Wi-Fi connectivity, and an easy-to-install LS engine harness in one integrated system. Dedicated, preconfigured inputs and outputs eliminate much of the wiring and software setup normally required with a universal standalone ECU, while Haltech’s LS Setup Wizard makes initial configuration straightforward.

This kit supports Gen III LS engines equipped with a cable-operated throttle body, EV1 high-impedance injectors, and a manual transmission.

Key Features

• Designed specifically for Gen III GM LS engines
• Complete terminated and labeled engine harness
• Included cable-throttle, throttle-position-sensor, and idle-air-control sub-harness
• Built-in Bosch LSU 4.9 wideband controller
• Built-in 4-bar MAP sensor for naturally aspirated or boosted combinations
• Automatic recognition of supported GM LS crankshaft and camshaft trigger patterns
• Onboard Wi-Fi and high-speed USB-C connectivity
• 32 MB onboard data logging
• Haltech LS Setup Wizard
• Up to 3D long-term learning
• Flex-fuel capability
• Closed-loop oxygen-sensor control
• 3D closed-loop boost control
• Dual-channel knock control
• Multi-level engine protection
• Launch control, traction control, flat shift, nitrous control, transbrake control, and anti-lag
• Direct control of the ignition, injectors, fuel pump, cooling fan, and an additional high-current auxiliary circuit
• Haltech CAN integration for compatible dashes, keypads, PDMs, wideband controllers, I/O expanders, and other Haltech CAN devices

Kit Includes

• HT-220001 — NEXUS Rebel LS ECU
• HT-186500 — Main terminated engine harness
• HT-186504 — Cable-throttle and IAC sub-harness
• HT-186501 — LS EV1 injector sub-harness
• HT-187003 — T56 manual-transmission harness
• HT-186123 — 2-pin Bosch alternator harness
• HT-186124 — 4-pin Delco alternator harness
• HT-186125 — 2-pin Yazaki alternator harness
• HT-186508 — Gen III knock-sensor adapter harness
• Bosch LSU 4.9 wideband oxygen sensor
• Weld-on oxygen-sensor bung
• M14 x 1.5 air-temperature sensor
• Weld-on air-temperature-sensor bung

ECU Specifications

• 8 preconfigured ignition outputs
• 8 preconfigured high-impedance injector outputs
• 5 user-configurable digital pulsed outputs
• Digital pulsed outputs are low-side switched and rated for up to 3 A each
• 4 user-configurable synchronized pulsed inputs
• Synchronized pulsed inputs support frequency, duty-cycle, and analog measurement
• Synchronized pulsed inputs support Hall-effect, optical, and reluctor sensors
• Maximum synchronized pulsed-input voltage of 25 V
• Maximum synchronized pulsed-input frequency of 22.5 kHz
• 2 user-configurable 0–5 V analog inputs
• Software-selectable 1 kΩ pull-up resistor on user-configurable analog inputs
• 2 dedicated differential crankshaft and camshaft position inputs
• Automatic recognition of 24x and 58x crankshaft trigger patterns
• Automatic recognition of 1x and 4x camshaft trigger patterns
• Half-sync operation supported without a camshaft-position signal
• 2 dedicated coolant-temperature and air-temperature inputs
• 2 dedicated fuel-pressure and oil-pressure inputs
• 4 throttle-position and accelerator-pedal-position inputs
• 1 external MAP-sensor input
• 1 onboard 4-bar MAP sensor
• 2 transmission or vehicle-speed-sensor inputs
• 2 dedicated knock-sensor inputs
• 1 onboard Bosch LSU 4.9 wideband channel
• 4 half-bridge outputs for idle-air control or drive-by-wire throttle operation
• 1 dedicated tachometer output
• 1 dedicated 25 A ignition and injector power output
• 1 dedicated 25 A fuel-pump output
• 1 dedicated 25 A cooling-fan output
• 1 user-configurable 25 A auxiliary output
• 1 Haltech CAN network
• High-speed USB 2.0 through a USB-C connection
• ECU configuration, data access, and firmware updates available while powered through USB
• Integrated Wi-Fi for wireless communication and data extraction
• Laptop and onboard data logging
• 32 MB onboard logging memory
• Up to 300 channels per log
• Maximum logging frequency of 1 kHz
• Integrated 4-channel oscilloscope
• 32 × 32 tuning-table resolution
• 8–22 V operating-voltage range
• Overall dimensions of 7.7 × 5.9 × 1.8 in. (196 × 149 × 44.5 mm), including connector protrusion
• Weight of approximately 2.53 lb. (1.15 kg)
• Ambient operating-temperature range of −40°F to 185°F (−40°C to 85°C)

Application Notes

• Intended for Gen III GM LS engines using a cable-operated throttle body.
• The included throttle sub-harness connects to a GM LS cable-operated throttle body with a throttle-position sensor and 4-wire idle-air-control valve.
• The supplied injector sub-harness uses EV1 injector connectors.
• The ECU supports high-impedance fuel injectors only.
• The Gen III knock-sensor adapter converts the two Gen IV-style knock-sensor connectors on the main harness to the single connector used by Gen III valley-mounted knock sensors.
• The main harness connects directly to a Gen III-style MAP sensor and early-style GM oil-pressure sensor.
• Later Gen IV MAP and oil-pressure sensors require the appropriate adapter harnesses, sold separately.
• The camshaft-sensor connector’s signal and sensor-power wires must be pinned into the appropriate connector positions for the specific camshaft sensor being used.
• The ECU automatically identifies supported 24x or 58x crankshaft patterns and 1x or 4x camshaft patterns when the engine is cranked.
• The included transmission harness connects the Rebel LS main harness to the vehicle-speed sensor on a T56 manual transmission.
• Other manual-transmission applications may require application-specific vehicle-speed and related transmission wiring.
• Drive-by-wire throttle control is supported by the ECU, but the required throttle and accelerator-pedal adapter harnesses are not included in this Gen III cable-throttle kit.
• Compatible electronically controlled GM automatic transmissions require a separate Haltech Ti-series transmission interface, transmission harness, and supporting configuration.
• Engines combining Gen III and Gen IV sensors, throttles, injectors, or pedals may require additional adapter harnesses.
• A flex-fuel composition sensor is supported but is not included.
• A fuel-pressure sensor is supported but is not included. Adding one allows fuel-pressure compensation and fuel-pressure-based engine-protection strategies.
• The onboard wideband controller supports one Bosch LSU 4.9 sensor. Dual-bank wideband monitoring requires an additional Haltech CAN wideband controller and sensor.
• The ECU provides one user-configurable 25 A auxiliary output that can operate a secondary fuel pump, additional cooling fan, starter solenoid, high-current solenoid, or another suitable switched 12 V load.
• The ECU requires direct battery-positive and battery-negative connections. The required 4 AWG battery cables are sold separately.
• The Rebel LS Setup Wizard generates an initial configuration based on the selected engine, camshaft, throttle, MAP sensor, fuel system, injectors, and ignition coils.
• The supplied base configuration is intended to start and operate the engine. Final calibration is still required for the actual engine, fuel system, induction system, exhaust, and vehicle combination.
• The ECU’s CAN network is intended for compatible Haltech CAN devices. Retention of factory instrument-cluster, ABS, body-control, or other OEM CAN functions requires separate application-specific integration.

Haltech Usage Notice

Haltech products are designed and sold for sanctioned off-road, competition, and non-emissions-controlled applications. The purchaser and installer are responsible for confirming compliance with all applicable federal, state, and local emissions and vehicle-use regulations.