Holley Terminator X LS Standalone Harness | PSI Conversion
APPLICATION: Fits Gen 4 LS and Vortec engines with a 58X reluctor wheel, a drive-by-cable (DBC) throttle body, and an electronically controlled automatic transmission (4L60E 1996-up or 4L80E 1993-up).
PARTS INCLUDED: Complete engine and transmission harness, instruction manual.
ADDITIONAL ITEMS REQUIRED: Holley Terminator X MAX ECU (554-153). Terminator X MAX is required for 4L60E/4L80E transmission control.
The PSI Conversion harness was designed as a higher-quality alternative to the standalone harnesses currently available, focusing on better components, greater efficiency, and a simplified installation. Every harness is built in the USA using SAE-1128 spec high-temp cross-linked polyethylene (TXL) wire, with terminals and connectors that meet or exceed OEM specifications from Delphi/Aptiv, Yazaki, and Kostal. All harnesses are 100% quality tested on Dynalab or Cirrus harness testing equipment.
The Terminator X ECU features real-time fuel learn, high impedance injector drivers, an integrated 1 bar MAP sensor, and four programmable inputs and outputs that are ideal for electric fans, boost control solenoids, and progressive nitrous control. It ships with base maps for common LS combinations, and the Holley setup wizard builds a self-learning tune to get the engine running. A custom tune from a professional tuner is still recommended on built engines.
KEY FEATURES:
- Standalone harness for Gen 4 LS/Vortec engines with a 58X reluctor and drive-by-cable throttle
- Wired for electronically controlled 4L60E (1996-up) or 4L80E (1993-up) automatic transmissions
- Requires the Holley Terminator X MAX ECU (554-153) for automatic transmission control
- Direct upgrade over the factory harness supplied in Holley Terminator X 550-series kits
- Built in the USA with SAE-1128 high-temp TXL wire and OEM-spec Delphi, Yazaki, and Kostal connectors
- Every harness is 100% quality tested on Dynalab or Cirrus equipment before it ships
DEFAULT CONFIGURATION:
- Cam Sensor: Non-VVT
- Alternator: 4-cavity
- MAF Type: LS3/LS7 cartridge
- MAP Sensor: Bosch LS3 09+
CONNECTIONS FOR:
- Fuse and relay box
- Fuel pump control (relay included)
- IAC and TPS (drive-by-cable throttle)
- IAT sensor
- Oil pressure sensor
- Wideband O2 sensor
- MAP sensor
- Engine coolant temperature sensor
- Alternator control
- Crankshaft position sensor
- Camshaft position sensor
- Fuel injectors
- Coil packs
- Automatic transmission control
- Knock sensors
CONNECTIONS YOU WILL NEED TO MAKE: Fuel pump (required), switched ignition power (required), and constant power at the starter 12V stud.
The PSI harness is a direct upgrade for the following Holley Terminator X kits: 550-903, 550-904, 550-905, 550-909, 550-910, 550-916, 550-917, 550-918, 550-919, 550-920, 550-926, 550-927, 550-928, 550-929, 550-930, 550-931, 550-932, 550-933, 550-934, and 550-935.
NOTE: For 6L80E/6L90E applications this harness must be paired with Holley Transmission Controller Kit 558-499, which is built and shipped separately by Holley.
