{"product_id":"holley-efi-terminator-x-service-ecu-replacement-controller","title":"Holley EFI Terminator X Service ECU – Replacement Controller","description":"\u003cp\u003eThe \u003cstrong\u003eHolley EFI Terminator X Service ECU – Replacement Controller\u003c\/strong\u003e is a standalone replacement electronic control unit designed for use with compatible Terminator X harnesses. This service ECU restores the core engine-management functions of an existing Terminator X installation without requiring the purchase of a complete EFI system.\u003c\/p\u003e\n\u003cp\u003eThe ECU supports real-time fuel learning, high-impedance injectors, Bosch LSU 4.9 wideband control, an internal 1-bar MAP sensor, advanced boost and nitrous strategies, data logging, and four programmable inputs and outputs. Eight built-in multi-color diagnostic LEDs provide quick visual feedback for power, sensor, crank, cam, throttle-position, and oxygen-sensor related issues.\u003c\/p\u003e\n\u003ch4\u003eIncludes:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e(1) Holley EFI Terminator X Service ECU\u003c\/li\u003e\n\u003cli\u003eIntegrated 1-Bar MAP Sensor\u003c\/li\u003e\n\u003cli\u003eIntegrated Bosch LSU 4.9 Wideband Controller\u003c\/li\u003e\n\u003cli\u003eEight Built-In Multi-Color Diagnostic LEDs\u003c\/li\u003e\n\u003cli\u003eMounting Hardware, Harnesses, Sensors, and Oxygen Sensor Sold Separately\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003ctable class=\"custom-specs-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eHolley EFI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e554-152\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eService ECU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHarness Compatibility\u003c\/td\u003e\n\u003ctd\u003eCompatible Terminator X Harnesses\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInjector Support\u003c\/td\u003e\n\u003ctd\u003eHigh-Impedance Injectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWideband Control\u003c\/td\u003e\n\u003ctd\u003eBosch LSU 4.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLSU 4.2 Compatibility\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal MAP Sensor\u003c\/td\u003e\n\u003ctd\u003e1 Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProgrammable Inputs\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProgrammable Outputs\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagnostic LEDs\u003c\/td\u003e\n\u003ctd\u003e8 Multi-Color LEDs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBoost Control\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProgressive Nitrous Control\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMulti-Stage Nitrous Control\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCAN-BUS Support\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Logging\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eE85 Support\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTraction Control Support\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Gender\u003c\/td\u003e\n\u003ctd\u003eMale\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Quantity\u003c\/td\u003e\n\u003ctd\u003e62\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Holes\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e7.45\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWidth\u003c\/td\u003e\n\u003ctd\u003e5.00\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e1.63\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.15 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003ctable class=\"custom-specs-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003cth\u003eCompatibility\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHolley Terminator X Harnesses\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHolley Terminator X Max Functions\u003c\/td\u003e\n\u003ctd\u003eNot Listed for This ECU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWideband Oxygen Sensor\u003c\/td\u003e\n\u003ctd\u003eBosch LSU 4.9 Only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVehicle Use\u003c\/td\u003e\n\u003ctd\u003eRacing Use Only Vehicles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMarine Applications\u003c\/td\u003e\n\u003ctd\u003eNot Recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eFitment Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIntended as a service replacement ECU for compatible Holley Terminator X harnesses.\u003c\/li\u003e\n\u003cli\u003eVerify the existing harness, ECU connector, engine configuration, ignition type, injector type, and software setup before ordering.\u003c\/li\u003e\n\u003cli\u003eThis listing describes the Terminator X service ECU identified as PN 554-152.\u003c\/li\u003e\n\u003cli\u003eAlthough the source information also discusses Terminator X Max features, it does not confirm that PN 554-152 provides transmission control or drive-by-wire control.\u003c\/li\u003e\n\u003cli\u003eRequires a genuine Bosch LSU 4.9 wideband oxygen sensor and will not operate with an LSU 4.2 sensor.\u003c\/li\u003e\n\u003cli\u003eThe internal 1-bar MAP sensor can be disabled when using a compatible external MAP sensor on boosted applications.\u003c\/li\u003e\n\u003cli\u003eLegal for sale or use only on vehicles used exclusively for competition that are not registered and may never be used on public roads.\u003c\/li\u003e\n\u003cli\u003eNot recommended for marine applications.\u003c\/li\u003e\n\u003cli\u003eOff-road installations should keep the ECU dry, protected from heat, and mounted with proper wiring support and strain relief.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eTech Insight\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003ch3\u003e1. Is this a complete Terminator X EFI kit?\u003c\/h3\u003e\n\u003cp\u003eNo. This is a standalone service ECU intended to replace the controller in an existing compatible Terminator X installation. Harnesses, sensors, wideband oxygen sensor, power wiring, and other EFI components are not listed as included.\u003c\/p\u003e\n\u003ch3\u003e2. Can this ECU be used with a Bosch LSU 4.2 oxygen sensor?\u003c\/h3\u003e\n\u003cp\u003eNo. The ECU is designed for a genuine Bosch LSU 4.9 wideband oxygen sensor and will not operate with an LSU 4.2 sensor.\u003c\/p\u003e\n\u003ch3\u003e3. What do the four inputs and four outputs support?\u003c\/h3\u003e\n\u003cp\u003eThe programmable inputs can accept 12-volt, ground, 5-volt, and frequency-based signals for sensors and activation triggers. The outputs can provide ground or PWM control for devices such as electric fans, boost-control solenoids, nitrous systems, and compatible idle-air-control hardware.\u003c\/p\u003e\n\u003ch3\u003e4. Can this ECU be used on a boosted engine?\u003c\/h3\u003e\n\u003cp\u003eYes. The ECU supports advanced boost-control strategies. For combinations that exceed the range of the internal 1-bar MAP sensor, the internal sensor can be disabled and a compatible external MAP sensor can be used.\u003c\/p\u003e\n\u003ch3\u003e5. How do the built-in diagnostic LEDs help during installation?\u003c\/h3\u003e\n\u003cp\u003eThe eight multi-color LEDs provide visual status information that can help identify setup and sensor problems, including failed throttle-position autoset, crank or cam signal faults, and possible wideband oxygen-sensor issues.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e","brand":"Holley","offers":[{"title":"Default Title","offer_id":56886572122278,"sku":"554-152","price":913.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8394\/6406\/files\/554-152-Holley-EFI-Terminator-X-Service-ECU-1.jpg?v=1785444071","url":"https:\/\/wideopendesign.com\/products\/holley-efi-terminator-x-service-ecu-replacement-controller","provider":"Wide Open Design","version":"1.0","type":"link"}