Haltech Nexus T2 is a 34-pin wire-in Haltech ECU on 1 connector: A (34 pins).
It has 6 injector outputs and 6 ignition outputs. The injector drivers are peak-and-hold, so low-impedance injectors run without a resistor pack. 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. One knock input covers an inline engine. Wideband control needs an external controller, usually over CAN. 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. The maker rates the 5V sensor supply at 200 mA in total.
Spec sheet
| Connectors | A (34)34 pins in this profile |
|---|---|
| Injector outputs | 6peak-and-hold (low-impedance capable) |
| Ignition outputs | 6logic-level: smart coils, or an igniter for dumb coils |
| Dedicated trigger inputs | 2VR or Hall |
| Knock inputs | 1 |
| Onboard wideband controllers | 0 |
| Onboard MAP sensor | Yes |
| CAN buses | 1 |
| Drive-by-wire | No |
| High-side outputs | 0 |
| Half-bridge outputs | 0 |
| 5V sensor supply | 1 pin200 mA stated by the maker |
Worth knowing
- The knock input shares pin A13 with SPI 2: one or the other.
Which builds it suits
Of the 58 swap presets in the planner, 0 fit as they are and 13 fit with add-ons; 45 do not fit at all. The add-on it asks for most often is the Haltech WB1 (single-channel CAN wideband). Where it falls short, it is usually not enough injector output (low-side). The planner fills anything a preset leaves open with its ordinary defaults, so your own build may land differently.
The Toyota 2JZ-GE distributor (NA, early) needs Haltech WB1 (single-channel CAN wideband) and Haltech HPI8 High Power Igniter (8-channel). The Mazda Rotary 13B-REW (FD RX-7) needs Haltech PD16 (Power Distribution Module) and Haltech WB1 (single-channel CAN wideband). It can't run the GM LT1 (Gen5 6.2 alum): not enough injector output (low-side). It can't run the Nissan RB25DET non-Neo S1 (R33, dumb coils): not enough knock inputs. 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 13
- Toyota 1JZ-GE distributor (NA, early) with Haltech WB1 (single-channel CAN wideband), Haltech HPI8 High Power Igniter (8-channel)
- Toyota 1JZ-GE VVT-i (coil pack) with Haltech WB1 (single-channel CAN wideband), Haltech HPI8 High Power Igniter (8-channel)
- Toyota 1JZ-GTE non-VVTi with Haltech WB1 (single-channel CAN wideband), Haltech HPI8 High Power Igniter (8-channel)
- Toyota 1JZ-GTE VVTi with Haltech WB1 (single-channel CAN wideband), Haltech HPI8 High Power Igniter (8-channel)
- Toyota 2JZ-GE distributor (NA, early) with Haltech WB1 (single-channel CAN wideband), Haltech HPI8 High Power Igniter (8-channel)
- Toyota 2JZ-GE VVT-i (coil pack) with Haltech WB1 (single-channel CAN wideband), Haltech HPI8 High Power Igniter (8-channel)
- Nissan SR20DET (S13) with Haltech WB1 (single-channel CAN wideband), Haltech HPI8 High Power Igniter (8-channel)
- Nissan SR20DET (S14) with Haltech WB1 (single-channel CAN wideband), Haltech HPI8 High Power Igniter (8-channel)
- Nissan SR20DET (S15) with Haltech WB1 (single-channel CAN wideband)
- Subaru EJ/FA EJ20 turbo single-AVCS (EJ207 v7-9) with Haltech WB2 (dual-channel CAN wideband)
- Subaru EJ/FA EJ20 turbo dual-AVCS (EJ207 GRB 2008+) with Haltech IO 12 Expander, Haltech WB2 (dual-channel CAN wideband)
- Mazda Rotary 13B-REW (FD RX-7) with Haltech PD16 (Power Distribution Module), Haltech WB1 (single-channel CAN wideband)
- Mazda Rotary 20B (Eunos Cosmo 3-rotor) with Haltech PD16 (Power Distribution Module), Haltech WB1 (single-channel CAN wideband)
Does not fit 45
- Toyota 2JZ-GTE non-VVTi not enough knock inputs
- Toyota 2JZ-GTE VVTi not enough knock inputs
- GM LS1 (Gen3 5.7 alum) not enough injector output (low-side)
- GM LS6 (Gen3 5.7 alum) not enough injector output (low-side)
- GM LS LQ4/LQ9 (Gen3 6.0 iron) not enough injector output (low-side)
- GM LS2 (Gen4 6.0 alum) not enough injector output (low-side)
- GM LS3 (Gen4 6.2 alum, car) not enough injector output (low-side)
- GM LS L76 (Gen4 6.0 alum) not enough injector output (low-side)
- GM LS L92 (Gen4 6.2 alum) not enough injector output (low-side)
- GM LS LY6/L96 (Gen4 6.0 iron) not enough injector output (low-side)
- GM LSA (Gen4 6.2 alum, S/C) not enough injector output (low-side)
- GM LT1 (Gen5 6.2 alum) not enough injector output (low-side)
- GM LT4 (Gen5 6.2 alum, S/C) not enough injector output (low-side)
- Ford Coyote 5.0 Gen1 (2011-14) not enough injector output (low-side)
- Ford Coyote 5.0 Gen2 (2015-17) not enough injector output (low-side)
- Ford Coyote 5.0 Gen3 (2018-23) not enough injector output (low-side)
- Ford Modular 4.6 2V (SOHC) not enough injector output (low-side)
- Ford Modular 4.6 4V Cobra (NA, cable) not enough injector output (low-side)
- Ford Modular 4.6 4V Terminator (S/C, cable) not enough injector output (low-side)
- Ford Modular 5.4 4V Ford GT (S/C, cable) not enough injector output (low-side)
- Ford Modular 5.4 4V GT500 (S/C, DBW) not enough injector output (low-side)
- Ford Coyote Voodoo 5.2 (GT350, flat-plane) not enough injector output (low-side)
- Ford Coyote Predator 5.2 (GT500, cross-plane, S/C) not enough injector output (low-side)
- Ford Barra 4.0 NA (182/190/195) not enough knock inputs
- Ford Barra 4.0 Turbo (240T/245T/270T/310T/325T) not enough knock inputs
- Nissan RB20DET not enough knock inputs
- Nissan RB25DET non-Neo S1 (R33, dumb coils) not enough knock inputs
- Nissan RB25DET non-Neo S2 (R33, smart coils) not enough knock inputs
- Nissan RB25DET Neo (R34) not enough knock inputs
- Nissan RB26DETT (R32/R33, dumb coils) not enough knock inputs
- Nissan RB26DETT (R34, smart coils) not enough knock inputs
- Nissan VR38DETT (R35 GT-R) not enough knock inputs
- Nissan VQ35DE (base, 2003-04) not enough knock inputs
- Nissan VQ35DE Rev-Up (2005-06) not enough knock inputs
- Nissan VQ35HR (High-Rev, 2007+) not enough knock inputs
- 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 knock inputs
Plan a build around the Haltech Nexus T2
Pin table
Connector A carries 6 injector outputs, 6 ignition outputs and 2 trigger inputs.
Show all 34 pins
| Pin | Function |
|---|---|
| A 1 | DPO 2 |
| A 2 | AVI 1 |
| A 3 | Ignition 1 |
| A 4 | Ignition 2 |
| A 5 | Ignition 3 |
| A 6 | Ignition 4 |
| A 7 | Ignition 5 (Nexus T2 only) |
| A 8 | Ignition 6 (Nexus T2 only) |
| A 9 | +5V sensor supply |
| A 10 | Power ground |
| A 11 | Sensor ground |
| A 12 | SPI 1 |
| A 13 | Knock / SPI 2 |
| A 14 | AVI 2 |
| A 15 | AVI 3 |
| A 16 | CAN High |
| A 17 | CAN Low |
| A 18 | DPO 1 |
| A 19 | Injector 1 |
| A 20 | Injector 2 |
| A 21 | Injector 3 |
| A 22 | Injector 4 |
| A 23 | DPO 3 |
| A 24 | DPO 5 |
| A 25 | DPO 4 |
| A 26 | +12V ECU power supply |
| A 27 | Injector 5 (Nexus T2 only) |
| A 28 | Injector 6 (Nexus T2 only) |
| A 29 | AVI 4 |
| A 30 | AVI 5 |
| A 31 | Trigger + |
| A 32 | Home + |
| A 33 | Trigger - |
| A 34 | Home - |
Other Haltech ECUs
The closest Haltech unit is the Haltech Elite 750. Against it, this one has 1 knock input (the Elite 750 has 0).
Source: Haltech documentation for the Nexus T2
Always verify against the manufacturer's manual and your tuner before wiring.