If you are using a factory harness and are after an easy ECU upgrade, take a look at Haltech Plug 'n' Play Adapter Kits. These adapters plug directly into your Haltech ECU and have a set of factory connectors on the other side which plug straight into the factory harness.
ECU Overview
Haltech's Nexus S3 is the successor to the acclaimed Elite 2500, offering a serious upgrade in performance and functionality. The S3 combines all the classic functionality of the Elite 2500 with new features and the superior processing power of the successful Nexus platform.
Product Details
- Suits: Plug 'n' Play replacement of the factory ECU for Mazda Miata (MX-5) NA 1.6L and 1.8L with 2-plug, 2-row factory ECU. Manual transmission only.
- Includes: Nexus S3 ECU, Injection molded plastic plug 'n' play adaptor harness, M14 x 1.5 air temp sensor with matching plug and pins, auxiliary I/O 16 Pin Tyco plug and pins.
- Notes: Does not support USDM OBDII 96-97, Special Edition SE and Anniversary models. All manual transmission 1.6L variants will require the factory throttle position sensor to be unplugged and removed. A full-range throttle position sensor alternative must be installed for correct functionality. Failure to do so will result in erratic behavior of the ECU at wide-open throttle along with damage to the ECU.
ECU Features
Automatic Transmission Control
Specifications
| Analog Voltage Inputs (AVI) | 11 |
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| Differential Engine Position Inputs | 2 (Trigger and Home) |
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| Digital Pulsed Inputs (DPI) | 0 |
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| Synchronized Pulsed Inputs (SPI) | 6 |
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| Knock Sensor Inputs | 2 |
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| On-board Wideband Controller | 1 x NTK/LSU 4.9 |
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| Injection | 8 (peak and hold) |
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| Ignition | 8 |
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| Ignition Switch Input | 1 |
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| Engine Control Relay output | 1 |
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| Total Digital Pulsed Outputs (DPO) | 6 |
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| Half Bridge Outputs (HBO) | 4 8A |
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| On-Board PDM | NO |
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| 25A High Current Outputs (HCO) | 0 |
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| CAN Bus Networks | 2 |
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| MAP sensor | Internal (4 BAR) |
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| Inertia / G-Sensor | NO |
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| USB 2.0 | USB-C |
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| Low Power Up via Cable | YES |
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| Wi-Fi | YES |
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| Compatible with Haltech Connect App | YES |
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| Anti-Lag/Rotational Idle | YES |
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| Boost Control | 4D Closed Loop |
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| Closed Loop O2 Control | Dual |
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| CO2 Control | YES |
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| Drive-By-Wire Throttle | Dual |
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| Engine Protection | Multi-Level |
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| Flat Shift Support | Advanced |
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| Flex Fuel | YES |
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| Intake Air Bleed Control | YES |
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| Knock Control | Dual |
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| Launch Control | YES |
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| Long Term Learning | Up to 4D |
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| Nitrous Control Stages | Up to 6 |
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| Race Timer | YES |
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| Rolling Anti-Lag | YES |
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| Shock Travel & Ride Height | YES |
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| Torque Management (Driveshaft and Engine RPM Targeting) | YES |
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| Traction Control | YES |
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| Trans Brake | YES |
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| Tuning Table Resolution | 32x32x8 4D |
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| Variable Cam Control | Up to 4 |
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| Onboard storage | 128MB |
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