Haltech Elite 550 is a 29-pin wire-in Haltech ECU on 1 connector: 34pin (29 pins).
It has 4 injector outputs and 4 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. There is no knock input. 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.
Spec sheet
| Connectors | 34pin (29)29 pins in this profile |
|---|---|
| Injector outputs | 4peak-and-hold (low-impedance capable) |
| Ignition outputs | 4logic-level: smart coils, or an igniter for dumb coils |
| Dedicated trigger inputs | 2VR or Hall |
| Knock inputs | 0 |
| 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 pin |
Worth knowing
- CAN is for Haltech CAN devices only.
- Internal MAP: Haltech's guide and website give different ranges; the page gives none.
Which builds it suits
Of the 58 swap presets in the planner, 0 fit as they are and 1 fits with add-ons; 57 do not fit at all. The add-on it asks for most often is the Haltech PD16 (Power Distribution Module). 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 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 Toyota 2JZ-GE distributor (NA, early): not enough injector output (low-side). It can't run the Ford Modular 4.6 4V Cobra (NA, cable): not enough injector output (low-side). It can't run the Nissan VQ35DE Rev-Up (2005-06): not enough injector output (low-side).
Fits with add-ons 1
- Mazda Rotary 13B-REW (FD RX-7) with Haltech PD16 (Power Distribution Module), Haltech WB1 (single-channel CAN wideband)
Does not fit 57
- Toyota 1JZ-GE distributor (NA, early) not enough injector output (low-side)
- Toyota 1JZ-GE VVT-i (coil pack) not enough injector output (low-side)
- Toyota 1JZ-GTE non-VVTi not enough injector output (low-side)
- Toyota 1JZ-GTE VVTi not enough injector output (low-side)
- Toyota 2JZ-GE distributor (NA, early) not enough injector output (low-side)
- Toyota 2JZ-GE VVT-i (coil pack) not enough injector output (low-side)
- Toyota 2JZ-GTE non-VVTi not enough injector output (low-side)
- Toyota 2JZ-GTE VVTi not enough injector output (low-side)
- 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 injector output (low-side)
- Ford Barra 4.0 Turbo (240T/245T/270T/310T/325T) not enough injector output (low-side)
- Nissan RB20DET not enough injector output (low-side)
- Nissan RB25DET non-Neo S1 (R33, dumb coils) not enough injector output (low-side)
- Nissan RB25DET non-Neo S2 (R33, smart coils) not enough injector output (low-side)
- Nissan RB25DET Neo (R34) not enough injector output (low-side)
- Nissan RB26DETT (R32/R33, dumb coils) not enough injector output (low-side)
- Nissan RB26DETT (R34, smart coils) not enough injector output (low-side)
- Nissan VR38DETT (R35 GT-R) not enough injector output (low-side)
- Nissan SR20DET (S13) not enough knock inputs
- Nissan SR20DET (S14) not enough knock inputs
- Nissan SR20DET (S15) not enough knock inputs
- Nissan VQ35DE (base, 2003-04) not enough injector output (low-side)
- Nissan VQ35DE Rev-Up (2005-06) not enough injector output (low-side)
- Nissan VQ35HR (High-Rev, 2007+) not enough injector output (low-side)
- Honda K20 (i-VTEC 2.0 NA) not enough knock inputs
- Honda K24 (i-VTEC 2.4 NA) not enough knock inputs
- Subaru EJ/FA EJ20 turbo single-AVCS (EJ207 v7-9) not enough knock inputs
- Subaru EJ/FA EJ20 turbo dual-AVCS (EJ207 GRB 2008+) not enough knock inputs
- Subaru EJ/FA EJ25 turbo single-AVCS (EJ257 2004-07) not enough knock inputs
- Subaru EJ/FA EJ25 turbo dual-AVCS (EJ257 2008+) not enough knock inputs
- Subaru EJ/FA FA20D (BRZ/86 NA) not enough knock inputs
- Subaru EJ/FA FA20DIT (WRX turbo 2015+) not enough knock inputs
- 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)
- Mazda Rotary 20B (Eunos Cosmo 3-rotor) not enough ignition outputs
- BMW S54 (3.2 NA I6, E46 M3) not enough injector output (low-side)
- BMW N54 (3.0 twin-turbo I6) not enough injector output (low-side)
Plan a build around the Haltech Elite 550
Pin table
Connector 34pin carries 4 injector outputs, 4 ignition outputs and 2 trigger inputs.
Show all 29 pins
| Pin | Function |
|---|---|
| 34pin 1 | DPO 2 (low-side aux) |
| 34pin 2 | AVI 1 (default O2 sensor) |
| 34pin 3 | IGN 1 (logic-level ignition) |
| 34pin 4 | IGN 2 |
| 34pin 5 | IGN 3 |
| 34pin 6 | IGN 4 |
| 34pin 9 | +5V DC sensor supply |
| 34pin 10 | Battery ground |
| 34pin 11 | Signal ground (sensor ref) |
| 34pin 12 | DPI 1 (digital pulsed input) |
| 34pin 14 | Throttle position sensor (AVI) |
| 34pin 15 | AVI 3 (default MAP) |
| 34pin 16 | CAN-H |
| 34pin 17 | CAN-L |
| 34pin 18 | DPO 1 (low-side aux) |
| 34pin 19 | INJ 1 (injector drive) |
| 34pin 20 | INJ 2 |
| 34pin 21 | INJ 3 |
| 34pin 22 | INJ 4 |
| 34pin 23 | DPO 3 (low-side aux) |
| 34pin 24 | DPO 5 (default fuel-pump relay) |
| 34pin 25 | DPO 4 (low-side aux) |
| 34pin 26 | +13.8V ECU / injector power feed |
| 34pin 29 | Air temperature (AVI, thermistor) |
| 34pin 30 | Coolant temperature (AVI) |
| 34pin 31 | Trigger (+) crank (VR or Hall) |
| 34pin 32 | Home (+) cam (VR or Hall) |
| 34pin 33 | Trigger (-) VR negative ref |
| 34pin 34 | Home (-) VR negative ref |
Other Haltech ECUs
The closest Haltech unit is the Haltech Nexus T1. Against it, this one has 0 knock inputs (the Nexus T1 has 1) and 29 pins (the Nexus T1 has 30).
Source: Haltech documentation for the Elite 550
Always verify against the manufacturer's manual and your tuner before wiring.