Haltech Elite 1500 Plug & Play Adapter Harness for 02-06 RSX

Haltech Elite 1500 Plug & Play Adapter Harness - 02-06 Acura RSX / 02-05 Civic Si

Want to upgrade to a Haltech Elite 1500 ECU without hacking up your factory harness? This plug and play adapter harness makes it happen. One end plugs into your Haltech Elite 1500 ECU, the other end plugs into your factory K series engine harness using the stock connectors. No cutting, no splicing, no rewiring your entire car. You can have a fully programmable Haltech ECU up and running in a few hours instead of spending days messing with wiring.

Plugs Straight Into Your Factory Harness

This adapter harness is designed to work with your stock 02-04 RSX or 02-05 Civic Si engine harness. It uses the factory ECU connectors on one side and plugs directly into the Haltech Elite 1500 on the other side. You get a clean, factory style installation without modifying your original wiring. If you ever need to go back to stock or sell the car, you can unplug the Haltech system and reinstall your factory ECU without any issues.

Complete Kit Ready to Install

This kit comes with everything you need to connect your Haltech Elite 1500 ECU to your K series engine. You get the injection molded plastic plug and play adapter harness, an M14 x 1.5 air temp sensor with matching plug and pins, and an auxiliary I/O 16 pin Tyco plug and pins for adding extra sensors or outputs. The harness also includes a quick start guide that walks you through the installation step by step, plus the full ECU manual and tuning software on CD or USB.

Opens Up Full Engine Tuning

Once you install this harness with your Haltech Elite 1500 ECU, you can tune every part of how your K series engine runs. You get full control over fuel delivery, ignition timing, VTEC engagement, cam timing, and boost control if you're running forced induction. The Haltech system lets you dial in exactly what your engine needs under all conditions, whether you're chasing max power on the dyno or just want better drivability and fuel economy.

Works on Manual Transmission Only

This harness is designed for manual transmission RSX and Civic Si models only. It does not support the factory multiplexed coolant temperature gauge, battery light, or AC request signal. You'll need to address these items separately if you want them to function. Check the quick start guide for more details on what works and what doesn't when you swap to the Haltech system.

Two Fitment Options Available

Haltech makes two different versions of this harness depending on which RSX you have. Make sure you pick the right one for your car.

02-04 RSX / 02-05 Civic Si (HT-140960)

This version works with the 02-04 Acura RSX and 02-05 Honda Civic Si EP3. It uses the earlier style factory ECU connectors found on these models.

05-06 RSX (HT-140961)

This version is specifically for the 05-06 Acura RSX. It includes a jumper harness that adapts the 05-06 chassis wiring to work with the 02-04 style ECU connectors, since the later RSX uses different wiring.

What You Get

• Injection molded plug and play adapter harness
• M14 x 1.5 air temperature sensor with plug and pins
• Auxiliary I/O 16 pin Tyco plug and pins
• Quick start installation guide
• Full ECU manual and tuning software (CD or USB)
• Direct plug into Haltech Elite 1500 ECU
• Direct plug into factory K series engine harness

Compatible Vehicles (Manual Transmission Only)

• 2002-2004 Acura RSX (with HT-140960 harness)
• 2002-2005 Honda Civic Si EP3 (with HT-140960 harness)
• 2005-2006 Acura RSX (with HT-140961 harness)
• K series engine swaps using 02-04 RSX engine harness

Requirements

• Haltech Elite 1500 ECU (sold separately)
• Manual transmission vehicle only
• Factory K series engine harness (02-04 RSX style connectors)

Does Not Support

• Factory multiplexed coolant temperature gauge
• Factory battery light
• Factory AC request signal
• Automatic transmission applications

Part Numbers: HT-140960 (02-04 RSX / 02-05 Civic Si), HT-140961 (05-06 RSX)

Note: Requires Haltech Elite 1500 ECU, sold separately. Professional installation and tuning recommended.