Haltech Nexus S3 Plug 'n' Play ECU and Adapter Harness Kit - Mazda MX5 NA

This adapter harness kit lets you fit a Haltech Nexus S3 ECU into your Mazda MX-5 NA wiring loom, without cutting or splicing the factory harness.

The Nexus S3 succeeds the Elite 2500 and carries over its full feature set with the added processing power of the Nexus platform. It has 8 peak/hold injector drivers and 8 low current ignition outputs, both of which double as low side drive outputs, plus 6 dedicated low side drive outputs with PWM capability. Four push-pull/half bridge outputs (8A, PWM capable) cover electronic throttle duties, alongside a single ECR output. Eleven 0-5V analog inputs give redundancy for the throttle and a switchable 5V pullup, and the trigger and home inputs use differential inputs with adjustable thresholds and glitch filters. Six synchronous pulsed inputs read cam sensors, frequency inputs or further 0-5V analog signals. The ECU carries an onboard wideband controller for NTK and LSU 4.9 sensors, a 4 bar MAP sensor, two CAN ports with switchable termination, and onboard logging of up to 300 channels at sample rates to 1kHz with 128MB of internal memory. This kit suits Plug 'n' Play replacement of the factory ECU on Mazda Miata (MX-5) NA 1.6L and 1.8L models with a 2-plug, 2-row factory ECU, manual transmission only. It does not support USDM OBDII 96-97, Special Edition SE or Anniversary models. On manual 1.6L variants you must unplug and remove the factory throttle position sensor and fit a full-range alternative for correct function; failure to do so causes erratic ECU behaviour at wide open throttle and can damage the ECU.

• Plug 'n' play harness, no factory wiring cut
• 8 injector drivers and 8 ignition outputs, both reassignable as low side drives
• Onboard wideband controller for NTK and LSU 4.9 sensors
• 4 bar onboard MAP sensor and two CAN ports with switchable termination
• Onboard logging: up to 300 channels at 1kHz with 128MB memory

In the box: Nexus S3 ECU, injection moulded plug 'n' play adapter harness, M14 x 1.5 air temperature sensor with matching plug and pins, auxiliary I/O 16 pin Tyco plug and pins.

Suits:

• Mazda Miata (MX-5) NA 1.6L and 1.8L, 2-plug 2-row factory ECU, manual transmission only

Please note: Does not support USDM OBDII 96-97, Special Edition SE or Anniversary models. Manual 1.6L variants need the factory throttle position sensor removed and a full-range replacement fitted, otherwise the ECU can suffer damage at wide open throttle.

• 1989 to 1993 Mazda MX5 (NA6C)
• 1993 to 1997 Mazda MX5 (NA8C)