Holley Terminator X is a 60-pin wire-in Holley ECU on 2 connectors: J1A (34 pins) and J1B (26 pins).
It has 8 injector outputs and 8 ignition outputs. The injector drivers are saturated, which means high-impedance injectors. Low-impedance ones need a ballast resistor pack or a different ECU. The ignition outputs are logic-level. Smart coils plug straight in; dumb coils need an igniter in between.
There are 2 dedicated trigger inputs, each happy with a VR or a Hall sensor. Two knock inputs cover both banks of a V engine. It has an onboard wideband controller, so a sensor wires straight in. The MAP sensor is built in.
It does not drive an electronic throttle, so plan on a cable throttle. One CAN bus handles dashes, PDMs and expansion. Three outputs can switch 12V as well as ground.
Spec sheet
| Connectors | J1A (34), J1B (26)60 pins in this profile |
|---|---|
| Injector outputs | 8saturated (high-impedance only) |
| Ignition outputs | 8logic-level: smart coils, or an igniter for dumb coils |
| Dedicated trigger inputs | 2VR or Hall |
| Knock inputs | 2 |
| Onboard wideband controllers | 1 |
| Onboard MAP sensor | Yes |
| CAN buses | 1 |
| Drive-by-wire | No |
| High-side outputs | 3 |
| Half-bridge outputs | 4H-bridge pairs for a throttle motor or stepper |
| 5V sensor supply | 1 pin |
Worth knowing
- Holley's diagram and product page disagree on whether outputs 1 and 2 switch 12V or ground.
Which builds it suits
Of the 58 swap presets in the planner, 0 fit as they are and 27 fit with add-ons; 31 do not fit at all. The add-on it asks for most often is the Holley Pro Dash (with I/O). Where it falls short, it is usually not enough drive-by-wire throttle motor (h-bridge). The planner fills anything a preset leaves open with its ordinary defaults, so your own build may land differently.
The Toyota 2JZ-GTE non-VVTi needs Holley Pro Dash (with I/O) and an external igniter. The Nissan SR20DET (S13) needs Holley Pro Dash (with I/O) and an external igniter. It can't run the GM LS LY6/L96 (Gen4 6.0 iron): not enough drive-by-wire throttle motor (h-bridge). It can't run the Ford Barra 4.0 Turbo (240T/245T/270T/310T/325T): not enough drive-by-wire throttle motor (h-bridge). It can't run the Mazda Rotary 13B-MSP Renesis (RX-8 manual, 6-injector): not enough drive-by-wire throttle motor (h-bridge).
Fits with add-ons 27
- Toyota 1JZ-GE distributor (NA, early) with an external igniter
- Toyota 1JZ-GE VVT-i (coil pack) with Holley Pro Dash (with I/O), an external igniter
- Toyota 1JZ-GTE non-VVTi with Holley Pro Dash (with I/O), an external igniter
- Toyota 1JZ-GTE VVTi with Holley Pro Dash (with I/O), an external igniter
- Toyota 2JZ-GE distributor (NA, early) with an external igniter
- Toyota 2JZ-GE VVT-i (coil pack) with Holley Pro Dash (with I/O), an external igniter
- Toyota 2JZ-GTE non-VVTi with Holley Pro Dash (with I/O), an external igniter
- GM LS1 (Gen3 5.7 alum) with a CAN wideband module
- GM LS6 (Gen3 5.7 alum) with a CAN wideband module
- GM LS LQ4/LQ9 (Gen3 6.0 iron) with a CAN wideband module
- Ford Modular 4.6 2V (SOHC) with a CAN wideband module, an external igniter
- Ford Modular 4.6 4V Cobra (NA, cable) with a CAN wideband module, an external igniter
- Ford Modular 4.6 4V Terminator (S/C, cable) with Holley Pro Dash (with I/O), a CAN wideband module, an external igniter
- Ford Modular 5.4 4V Ford GT (S/C, cable) with Holley Pro Dash (with I/O), a CAN wideband module, an external igniter
- Nissan RB20DET with Holley Pro Dash (with I/O), an external igniter
- Nissan RB25DET non-Neo S1 (R33, dumb coils) with Holley Pro Dash (with I/O), an external igniter
- Nissan RB25DET non-Neo S2 (R33, smart coils) with Holley Pro Dash (with I/O)
- Nissan RB25DET Neo (R34) with Holley Pro Dash (with I/O)
- Nissan RB26DETT (R32/R33, dumb coils) with Holley Pro Dash (with I/O), an external igniter
- Nissan RB26DETT (R34, smart coils) with Holley Pro Dash (with I/O)
- Nissan SR20DET (S13) with Holley Pro Dash (with I/O), an external igniter
- Nissan SR20DET (S14) with Holley Pro Dash (with I/O), an external igniter
- Nissan SR20DET (S15) with Holley Pro Dash (with I/O)
- Subaru EJ/FA EJ20 turbo single-AVCS (EJ207 v7-9) with Holley Pro Dash (with I/O), a CAN wideband module
- Subaru EJ/FA EJ20 turbo dual-AVCS (EJ207 GRB 2008+) with Holley Pro Dash (with I/O), a CAN wideband module
- Mazda Rotary 13B-REW (FD RX-7) with Holley Pro Dash (with I/O)
- Mazda Rotary 20B (Eunos Cosmo 3-rotor) with Holley Pro Dash (with I/O)
Does not fit 31
- Toyota 2JZ-GTE VVTi not enough drive-by-wire throttle motor (h-bridge)
- GM LS2 (Gen4 6.0 alum) not enough drive-by-wire throttle motor (h-bridge)
- GM LS3 (Gen4 6.2 alum, car) not enough drive-by-wire throttle motor (h-bridge)
- GM LS L76 (Gen4 6.0 alum) not enough drive-by-wire throttle motor (h-bridge)
- GM LS L92 (Gen4 6.2 alum) not enough drive-by-wire throttle motor (h-bridge)
- GM LS LY6/L96 (Gen4 6.0 iron) not enough drive-by-wire throttle motor (h-bridge)
- GM LSA (Gen4 6.2 alum, S/C) not enough drive-by-wire throttle motor (h-bridge)
- GM LT1 (Gen5 6.2 alum) not enough drive-by-wire throttle motor (h-bridge)
- GM LT4 (Gen5 6.2 alum, S/C) not enough drive-by-wire throttle motor (h-bridge)
- Ford Coyote 5.0 Gen1 (2011-14) not enough drive-by-wire throttle motor (h-bridge)
- Ford Coyote 5.0 Gen2 (2015-17) not enough drive-by-wire throttle motor (h-bridge)
- Ford Coyote 5.0 Gen3 (2018-23) not enough drive-by-wire throttle motor (h-bridge)
- Ford Modular 5.4 4V GT500 (S/C, DBW) not enough drive-by-wire throttle motor (h-bridge)
- Ford Coyote Voodoo 5.2 (GT350, flat-plane) not enough drive-by-wire throttle motor (h-bridge)
- Ford Coyote Predator 5.2 (GT500, cross-plane, S/C) not enough drive-by-wire throttle motor (h-bridge)
- Ford Barra 4.0 NA (182/190/195) not enough drive-by-wire throttle motor (h-bridge)
- Ford Barra 4.0 Turbo (240T/245T/270T/310T/325T) not enough drive-by-wire throttle motor (h-bridge)
- Nissan VR38DETT (R35 GT-R) not enough drive-by-wire throttle motor (h-bridge)
- Nissan VQ35DE (base, 2003-04) not enough drive-by-wire throttle motor (h-bridge)
- Nissan VQ35DE Rev-Up (2005-06) not enough drive-by-wire throttle motor (h-bridge)
- Nissan VQ35HR (High-Rev, 2007+) not enough drive-by-wire throttle motor (h-bridge)
- Honda K20 (i-VTEC 2.0 NA) not enough drive-by-wire throttle motor (h-bridge)
- Honda K24 (i-VTEC 2.4 NA) not enough drive-by-wire throttle motor (h-bridge)
- Subaru EJ/FA EJ25 turbo single-AVCS (EJ257 2004-07) not enough drive-by-wire throttle motor (h-bridge)
- Subaru EJ/FA EJ25 turbo dual-AVCS (EJ257 2008+) not enough drive-by-wire throttle motor (h-bridge)
- Subaru EJ/FA FA20D (BRZ/86 NA) not enough drive-by-wire throttle motor (h-bridge)
- Subaru EJ/FA FA20DIT (WRX turbo 2015+) not enough drive-by-wire throttle motor (h-bridge)
- Mazda Rotary 13B-MSP Renesis (RX-8 manual, 6-injector) not enough drive-by-wire throttle motor (h-bridge)
- Mazda Rotary 13B-MSP Renesis (RX-8 auto, 4-injector) not enough drive-by-wire throttle motor (h-bridge)
- BMW S54 (3.2 NA I6, E46 M3) not enough knock inputs
- BMW N54 (3.0 twin-turbo I6) not enough drive-by-wire throttle motor (h-bridge)
Plan a build around the Holley Terminator X
Pin table
By connector: J1A carries 2 trigger inputs, 2 knock inputs and 10 analog inputs; J1B carries 8 injector outputs, 8 ignition outputs and 4 H-bridge outputs.
Show all 60 pins
| Pin | Function |
|---|---|
| J1A A1 | Coil - |
| J1A A2 | Fuel pump relay out (10A max) |
| J1A A3 | Input #2 (F,5,2,T,H,G) |
| J1A A4 | Input #4 (F,G,5) |
| J1A A5 | TPS signal |
| J1A A6 | Points output |
| J1A A7 | WBI_COMPR2 |
| J1A A8 | WBI shield |
| J1A A9 | WBI HTR- |
| J1A A10 | Switched +12V in |
| J1A A11 | MAT input |
| J1A A12 | Input #1 (F,5,2,T,H,G) |
| J1A A13 | Input #3 (F,G,5) |
| J1A A14 | IPU ground |
| J1A A15 | Gauge output |
| J1A A16 | WBI_COMPR1 |
| J1A A17 | WBI VS-/IP- |
| J1A A18 | Sensor ground out |
| J1A A19 | Coolant temp in |
| J1A A20 | Oil pressure |
| J1A A21 | Knock #2 in |
| J1A A22 | Cam input (DIG & IPU)/bypass |
| J1A A23 | MAP sensor signal |
| J1A A24 | CAN LO |
| J1A A25 | WBI VS+ |
| J1A A26 | Sensor +5V ref out |
| J1A A27 | Not used |
| J1A A28 | EST/SPOUT out |
| J1A A29 | Knock #1 input |
| J1A A30 | Crank input (DIG & IPU) |
| J1A A31 | Fuel pressure |
| J1A A32 | CAN HI |
| J1A A33 | WBI IP+ |
| J1A A34 | WBI HTR+ |
| J1B B1 | IAC A LO |
| J1B B2 | IAC A HI |
| J1B B3 | PWM #4 out (G,P-) |
| J1B B4 | Injector F |
| J1B B5 | Injector G |
| J1B B6 | Injector H |
| J1B B7 | Injector E |
| J1B B8 | IAC B LO |
| J1B B9 | IAC B HI |
| J1B B10 | PWM #3 out (G,P-) |
| J1B B11 | PWM #2 out (H,P+) |
| J1B B12 | PWM #1 out (H,P+) |
| J1B B13 | Injector D |
| J1B B14 | EST ground out |
| J1B B15 | EST 2 (cylinder #2) |
| J1B B16 | EST 4 (cylinder #4) |
| J1B B17 | EST 6 (cylinder #6) |
| J1B B18 | EST 8 (cylinder #8) |
| J1B B19 | Injector A |
| J1B B20 | EST 12V out |
| J1B B21 | EST 1 (cylinder #1) |
| J1B B22 | EST 3 (cylinder #3) |
| J1B B23 | EST 5 (cylinder #5) |
| J1B B24 | EST 7 (cylinder #7) |
| J1B B25 | Injector C |
| J1B B26 | Injector B |
Other Holley ECUs
The closest Holley unit is the Holley HP EFI. Against it, this one has saturated injector drive (the HP EFI is peak-and-hold).
Source: Holley document Terminator X and X Max Manual
Always verify against the manufacturer's manual and your tuner before wiring.