Nexus S2 ECU Only (HT-212000)
Nexus S2 ECU Only (HT-212000)
Nexus S2 ECU Only (HT-212000)
Nexus S2 ECU Only (HT-212000)
Nexus S2 ECU Only (HT-212000)
ECU
ECU

Engine management

Harness
Harness

Sold separately

Connector Kit
Connector Kit

Sold separately

Vendor:Haltech

Nexus S2 ECU Only (HT-212000)

SKU: HT-212000

Nexus Must-Haves
$1,830.00
ECU
ECU

Engine management

Harness
Harness

Sold separately

Connector Kit
Connector Kit

Sold separately
From Shawn: Not sure this product is right for your build? Email me at service@tunedbyshawn.com before you order. I answer these myself.
NSP - Nexus Software Programmer Download

ECUs always ship FREE with Tuned By Shawn!

Manufacturer Limited Warranty

Product details

Description

Nexus S2 ECU Only. Genuine Haltech hardware, built to integrate with the rest of the system.

Why It Matters

Correct pinouts the first time, labelled circuits that make diagnosis simple, and factory-grade terminations with no splices to suspect later. Wiring is where builds stall, and purpose-built harnesses are how they don't.

Upgrade your engine's performance with the Nexus S2 ECU, featuring advanced race features and data logging. Designed for engines with up to 4 cylinders or 2 rotors. Includes mounting bolts, USB-C cable and dust cap, Quick Start Guide, and Wiring Diagram.

The Details

  • SKU: HT-212000

Nexus S2 ECU Pinout

Complete pin-by-pin map of both Nexus S2 ECU connectors. Wire colors are those of the Nexus S3/S2 universal wire-in harness, which is sold separately.

Connector A

34-pin AMP, Keyway 1 - power, ground, injectors, ignition, DPO, HBO and CAN 1.

A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
A26
A27
A28
A29
A30
A31
A32
A33
A34

Looking into the connector on the ECU

Pin Function Harness Wire Color
A1 Injector 1 Blue
A2 Injector 2 Blue/Black
A3 Injector 3 Blue/Brown
A4 Injector 4 Blue/Red
A5 Injector 5 (S3 only) Blue/Orange
A6 Injector 6 (S3 only) Blue/Yellow
A7 Injector 7 (S3 only) Blue/Green
A8 Injector 8 (S3 only) Blue/Violet
A9 DPO 1 Violet/Black
A10 Battery Ground Input Black
A11 Battery Ground Input Black
A12 DPO 2 Violet/Brown
A13 Ignition Switch Input Pink
A14 DPO 3 Violet/Red
A15 DPO 4 Violet/Orange
A16 DPO 5 Violet/Yellow
A17 DPO 6 Violet/Green
A18 Switched +12V Input Red
A19 HBO 1 Brown/Black
A20 HBO 2 Brown/Red
A21 HBO 3 Brown/Green
A22 HBO 4 Brown/Pink
A23 CAN 1 High White
A24 CAN 1 Low Blue
A25 Switched +12V Input Red
A26 ECR Output Black/Red
A27 Ignition 1 Yellow/Black
A28 Ignition 2 Yellow/Red
A29 Ignition 3 Yellow/Orange
A30 Ignition 4 Yellow/Green
A31 Ignition 5 (S3 only) Yellow/Brown
A32 Ignition 6 (S3 only) Yellow/Blue
A33 Ignition 7 (S3 only) Yellow/Violet
A34 Ignition 8 (S3 only) Yellow/Grey

Connector C

34-pin AMP, Keyway 2 - engine position, sensors, inputs, knock, wideband and CAN 2.

C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
C14
C15
C16
C17
C18
C19
C20
C21
C22
C23
C24
C25
C26
C27
C28
C29
C30
C31
C32
C33
C34

Looking into the connector on the ECU

Pin Function Harness Wire Color
C1 Trigger (Crank) + Yellow
C2 Trigger (Crank) - Green
C3 Home (Cam) + Yellow
C4 Home (Cam) - Green
C5 SPI 1 Grey/Brown
C6 SPI 2 Grey/Red
C7 SPI 3 Grey/Orange
C8 SPI 4 Grey/Yellow
C9 Sensor +8V Supply Orange/White
C10 AVI 1 White
C11 AVI 2 White/Yellow
C12 AVI 3 White/Grey
C13 AVI 4 White/Violet
C14 AVI 5 White/Green
C15 AVI 6 White/Orange
C16 AVI 7 White/Black
C17 AVI 8 White/Brown
C18 AVI 9 White/Red
C19 SPI 5 Grey/Pink
C20 SPI 6 Grey/Light Green
C21 CAN 2 High White
C22 CAN 2 Low Blue
C23 Knock 1 White
C24 Knock 2 White
C25 Sensor +5V Supply Orange
C26 Signal Ground Black/White
C27 AVI 10 Light Green
C28 AVI 11 Light Green/Black
C29 WBI 1 Heater + Grey
C30 WBI 1 Input Yellow
C31 WBI 1 Pump Red
C32 WBI 1 Nernst Black
C33 WBI 1 Heater - White
C34 WBI 1 Cal Green

Trigger and Home run in shielded four-core cable (Trigger: grey jacket, Home: grey/black jacket). The red +12V and black signal-ground cores in those cables land elsewhere, not on Connector C. Knock 1 and Knock 2 each run in shielded two-core cable. Shielded cables should be earthed at one end only.

Active on the Nexus S2 Not available on the S2 (S3 only)

Pinout data taken from the Haltech Nexus S3 / Nexus S2 Universal Wire-In Harness wiring diagram (HT-182200, revision 1.1) and the Nexus S3/S2 Quick Start Guide. The S2 and S3 share a connector layout; positions greyed out above are present in the connector but have no output on an S2. This listing is the ECU only - the wire-in harness, sensors and hardware are sold separately.

Applications

Unsure whether this suits your ECU or build? Send us the details before ordering and we will confirm compatibility.

As a Platinum Haltech Dealer, Tuned By Shawn can confirm fitment for your exact setup before you order, and remote tuning over live Zoom is available once everything is installed.