Nexus Ti4L - Transmission Interface Kit, suits GM 4L Series

Nexus Ti4L - Transmission Interface Kit, suits GM 4L Series

Overview



The Nexus Ti4L Transmission Interface offers a seamless and efficient solution for controlling GM 4L series automatic transmissions via your Nexus ECU or VCU. Whether setting up a new system or upgrading an existing vehicle, the Ti4L kit provides precise and reliable transmission control. Designed for use with a Nexus series transmission harness (HT-187000), it allows a Nexus ECU or VCU to integrate with and manage supported GM 4L series transmissions.

The Ti4L kit is also plug-and-play compatible with the Rebel LS ECU and its terminated harness, simplifying installation for those streamlining transmission control in LS engine setups.

Features

• Fully terminated transmission harness to suit GM 4Lx0E transmissions
• Transmission line pressure closed-loop control using a 500 psi sensor and remote-mount installation hardware
• Plug and Play with a Nexus Rebel LS ECU terminated harness
• Easy Rebel LS Setup Wizard using the Haltech NSP Software or Haltech Connect App

What's included?

• HT-196001 - Nexus Ti4L
• HT-187000 - Transmission Harness (4Lx0E)
• HT-010917 - 500 psi Haltech pressure sensor
• 1/8 NPT male to -4AN male 90° fitting
• -4AN male to 1/8 NPT female adapter
• -4AN female to -4AN female hose (450mm/18”)
• P-clamp mount
• M8 x 30mm bolt and spacer
• Quick start guide

Nexus Ti4L Installation

1. Prepare the workspace - Park the vehicle on a flat surface and engage the parking brake. Lift the vehicle using a hoist, or secure it with jack stands if using a jack. Ensure the engine/transmission is cool before beginning the installation.

2. Install the Nexus Ti4L and transmission harness - Locate the transmission breakout connector on the transmission harness and plug it into the corresponding transmission breakout connector on the Rebel LS main terminated harness. Next, plug the Nexus Ti4L into the 34-pin Superseal connector on the transmission harness. Find a suitable location in the engine bay (e.g. firewall) to mount the Nexus Ti4L that still allows the
transmission harness to reach the transmission connections.

3. Locate the transmission connectors - Identify the following connectors on your GM 4L60 or 4L80 transmission, and plug the transmission harness into each one:

• Main transmission connector - Connects to solenoids, switches, temperature sensor, and other devices within the transmission.
• Turbine speed sensor - Located near the torque converter (Not available on 4L60E, just leave unplugged and tucked away).
• Vehicle speed sensor - Typically found near the tail shaft of the transmission.
• Oil pressure port (1/8 NPT) - for installing the included transmission line pressure sensor.


Note: 4L60E transmissions do not have turbine speed sensors, and the VSS and main connector are located on the opposite (right) side.

4. Install the line pressure sensor - Locate the 1/8 NPT oil pressure port on the transmission, usually found on the left side of the transmission case. Remove the blocking plug to install the included line pressure sensor, and connect the line pressure sensor connector found on the transmission harness. Installing the line pressure sensor enables the Rebel LS ECU to perform closed-loop line pressure control and learning strategies as intended in the base map. If space under the transmission tunnel is limited, use the 90° fitting and extension hose to install the sensor remotely. Secure the extension hose and sensor using the supplied P-clamp to prevent movement. If the transmission is fitted with an aftermarket cast pan, you may choose to install the p clamp onto an existing pan bolt and forgo the spacer and longer bolt. Installation photos are
shown below as an example.



5. Check all connections - Double-check all connections for tightness and proper routing. Ensure the harness is securely fastened with zip ties to prevent contact with moving parts or heat sources. Carefully lower the vehicle from the jack stands. 

At this stage, your Nexus Ti4L is successfully installed and ready to be configured within the Rebel LS ECU using the Nexus Software Programmer (NSP).

NOTE: If you are using this kit with a universal Nexus series ECU or VCU, the installation process is the same, except the DTM06-8S transmission breakout connector will need to be wired to the Nexus ECU using a DTM04-8P receptacle connector.

Pins 1 and 2 are the power supply and ground pins to the Nexus Ti4L, respectively. Pins 3 and 4 are the CAN High and Low pins and must be connected to the ECU’s CAN High and Low pins assigned for Haltech CAN devices. Pins 5 and 8 are the Vehicle Speed Sensor connections and must be wired to an SPI and Signal Ground, respectively.


Installing the NSP software

Haltech NSP (Nexus Software Programmer) is the software used for configuring the Nexus Ti4L Transmission Interface. Follow these steps to install the Haltech NSP software:

1. Download the NSP installer - Go to the Haltech website, navigate to the ‘Downloads’ section, and click on the download link for Nexus Software Programmer.


2. Run the installer file - Once the download is complete, locate the downloaded file (usually in the ‘Downloads’ folder of your computer) and double click on the file to run the Nexus Software Setup Wizard.


3. Launch Haltech NSP - Once the installation is complete, you can launch the Haltech NSP software from the Windows ‘Start’ menu or using the desktop shortcut that was created.



Going online with your Nexus Rebel LS ECU


The Nexus Ti4L Transmission Interface is a Haltech CAN device configured within your Nexus Rebel LS ECU. To begin, open the NSP software and connect the supplied Haltech USB cable between your laptop
and the USB-C port on the front of your Nexus ECU. This USB connection allows the NSP software to read or write settings into the ECU or use the Rebel LS Setup Wizard if you’re starting a new map.



Nexus Ti4L setup using the Wizard


The Setup Wizard will guide you through creating a basemap by defining the specific engine, camshaft, throttle type, MAP sensor, injectors, and ignition coils you’re using. Additionally, the Wizard will let you select which GM 4L series transmission you have.



Completing the Wizard will enable the NSP software to create a tailored basemap for your application. This will configure all the necessary settings, tables, and input/output wire assignments across the Rebel LS ECU and the Nexus Ti4L Transmission Interface. 

At this point, your engine and transmission is now ready for tuning.

Nexus Ti4L - setting up manually

If you are manually setting up the Nexus Ti4L Transmission Interface - such as when modifying an existing ECU map or using the Nexus Ti4L with a universal Nexus ECU/VCU - the first step is to go to the Transmission section in the Navigation tree on the left side of the NSP software and click ‘Select Transmission.’ This will open a window displaying a list of GM 4L series transmissions. Select the one that matches your setup, and the NSP software will adjust the transmission control strategy accordingly.



After selecting the correct transmission, change the ‘Control Type’ setting from ‘Internal’ to ‘Ti4L.’ This will reassign the inputs and outputs from the ECU to the Ti4L’s. The Ti4L inputs and outputs are preset to match the Ti4L Transmission Harness (HT-187000) and cannot be reassigned.


Lastly, ensure that the line pressure sensor, transmission oil temperature sensor, and all other transmission control-related sensors are correctly calibrated in the software for proper operation.

Nexus Ti4L Specifications




Nexus Ti4L Pinout Information




Nexus Ti4L Dimensions



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