How To Install Terminator X EFI On Any LS Engine

Terminator X EFI

If you are thinking about installing a Terminator X in your LS engine swapped vehicle, this how-to is for you!

These units make such good sense because they offer Plug and Play Standalone Engine Management at a budget price, and are compatible with most modern domestic V8 Engines.

  • Terminator X works on any LS-based engine including common 4.8, 5.3, or 6.0 truck engines (often referred to as LQ4, lQ9, LM7, L33, etc.)

Terminator X and Terminator X Max

Holley offers two powertrain management systems that feature plug and play control for most domestic V8 engines starting at just $999.

Why settle for a junkyard or factory ECU with a cumbersome aftermarket tuning interface when you can get complete control of your engine, self-learning fuel strategies, and the proven, race-winning technology of Holley EFI for under $1,000…

Terminator X and Terminator X Max Features and Benefits

  • Plug and play Domestic V8 engine control
  • Drive-by Wire Throttle Body Control (Terminator X Max Only)
  • Transmission Control (Terminator X Max Only)
  • Genuine Bosch LSU 4.9 Wideband Control (Will not work with LSU 4.2 Oxygen Sensors)
  • On-Board Diagnostic LEDS for: ECU Power – Engine Run – Wideband Status – TPS Calibration – Crank Signal – Cam Signal. Allow you to identify any Critical engine issues at a glance
  • Built in 1bar MAP Sensor, vacuum hose adapters included (1/8th – ¼ and 3/16ths) – or for Boosted applications, you can disable the internal MAP sensor, and utilize an external MAP Sensor, the harness comes with the connector terminated, making the installation a snap.
  • 4 Inputs – 12v, Ground, 5v, and Frequency, for things such as additional pressure sensors, or activation triggers for nitrous activation, or a trans brake (Fuel and Oil Pressure Inputs are pre-terminated)
  • 4 Outputs – Ground, PWM – , for accessories such as; fans, boost control, nitrous control, IAC Kit, and More
  • Boost Control – Boost vs Time, Boost vs Gear, Boost vs RPM, Boost vs Speed, Boost Safeties
  • Nitrous Control – Single Channel of Wet or Dry, Progressive or Non-Progressive, Rich/Lean Safeties, and target Closed Loop AFR
  • Advanced Tables – 4x 1D Tables, 1x 1D per Gear Table, 4x 2D Tables, 1x 2D per Gear Table
  • Integrated Datalogging to the 3.5” Handheld SD Card
  • Free EFI Tuning Software for complete control of your Terminator X power plant

Diagnostic LEDs Offer Troubleshooting at a Glance

8 Built-in multi-color diagnostic LEDs allow you to quickly identify a variety of potential system issues, such as a failed TPS Autoset – faulty crank or cam sensors, or potential oxygen sensor issues!

  1. ECU Power – Green = ON
  2. Engine Running – Green = Running – Yellow = No RPM
  3. Wideband Status – Blue = Too Hot, Too Cold, Slow Warmup, or Uncalibrated, Green = OK!, Red = Sensor Failure, Yellow = Sensor Heating, Off = Sensor Disabled.
  4. TPS Calibration – Green – Calibrated, Red = Calibration Error, Cyan = DBW Pedal Calibration Error, Purple = DBW TB Calibration Error.
  5. Undefined – Future Use!
  6. Crank Signal – Green = Tooth Detected, below crank to run RPM (400RPM), Blue = Gap Detected, below crank to run RPM (400RPM), Red = Crank Error Detected, Off – Synced Properly.
  7. Cam Signal – Green = Tooth Detected, below crank to run RPM (400RPM), Blue = Gap Detected, below crank to run RPM (400RPM), Red = Cam Error Detected, Off – Synced Properly.
  8. Undefined – Future Use!

How To Identify GM LS 24 or 58 Tooth Crank Sensors

Proper sensor identification is critical when selecting any LS EFI system.

  • 24x sensors operate at 12v. Black.
  • 58x sensors operate at 5v. Gray.
GM LS 24 Tooth Crank Sensor - Black
Black Crank Sensors are found on 24x (tooth) LS engines
GM LS 58 Tooth Crank Sensor - Gray
Gray Crank Sensors are found on 58x (tooth) LS engines

How To Identify GM LS Injector Connectors

GM used three different injector connector styles on the LS engines.

Bosch (EV1)
USCAR (EV6)
Multec 2 (Early LS truck engines)

Terminator X ECU Connections

  • J1A – Main Harness Connector – This connector is primarily an “Input” connector. It contains all the sensor inputs and wide band oxygen sensor control.
  • J1B – Main Harness Connector – The second connector is the “J1B” connector (26 pin). This connector is the “output” connector. It has 8 injector outputs and outputs for other devices.
  • MAP Sensor – used on N/A applications, connect directly to left manifold vacuum port on the intake manifold.
  • Main Power – Connects to the Main Power Harness, these two wires MUST be wired directly to the Battery Terminals.

Terminator X Max ECU Connections

  • J1A – Main Harness Connector – This connector is primarily an “Input” connector. It contains all the sensor inputs and wide band oxygen sensor control.
  • J1B – Main Harness Connector – The second connector is the “J1B” connector (26 pin). This connector is the “output” connector. It has 8 injector outputs and outputs for other devices.
  • MAP Sensor – used on N/A applications, connect directly to right manifold vacuum port on the intake manifold.
  • Main Power – Connects to the Main Power Harness, these two wires MUST be wired directly to the Battery Terminals.
  • J3 – Connection point for the Drive-By-Wire harness.
  • J4 – Connection point for the Transmission harness.