ECU spec · Haltech

Haltech Elite 2500 pinout and specs

Checked against the maker's documents 27 September 2026

Haltech Elite 2500 is a 62-pin wire-in Haltech ECU on 3 connectors: A (34 pins), B (26 pins) and AUX (2 pins).

It has 8 injector outputs and 8 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. Two knock inputs cover both banks of a V engine. Wideband control needs an external controller, usually over CAN. The MAP sensor is built in.

Drive-by-wire is native: 1 throttle from its own H-bridge outputs. Two CAN buses handle dashes, PDMs and expansion. The maker rates the 5V sensor supply at 100 mA in total.

Spec sheet

ConnectorsA (34), B (26), AUX (2)62 pins in this profile
Injector outputs8peak-and-hold (low-impedance capable)
Ignition outputs8logic-level: smart coils, or an igniter for dumb coils
Dedicated trigger inputs2VR or Hall
Knock inputs2
Onboard wideband controllers0
Onboard MAP sensorYes
CAN buses2
Drive-by-wireYes, 1 throttle
High-side outputs0
Half-bridge outputs2H-bridge pairs for a throttle motor or stepper
5V sensor supply1 pin100 mA stated by the maker

Which builds it suits

Of the 58 swap presets in the planner, 0 fit as they are and 57 fit with add-ons; 1 does not fit at all. The add-on it asks for most often is the Haltech WB2 (dual-channel CAN wideband). Where it falls short, it is usually not enough knock inputs. The planner fills anything a preset leaves open with its ordinary defaults, so your own build may land differently.

The Toyota 1JZ-GE VVT-i (coil pack) needs Haltech WB1 (single-channel CAN wideband) and Haltech HPI8 High Power Igniter (8-channel). The Ford Barra 4.0 Turbo (240T/245T/270T/310T/325T) needs Haltech WB1 (single-channel CAN wideband) and Haltech HPI8 High Power Igniter (8-channel). It can't run the BMW S54 (3.2 NA I6, E46 M3): not enough knock inputs.

Fits with add-ons 57
Does not fit 1

Plan a build around the Haltech Elite 2500

Pin table

By connector: A carries 8 injector outputs, 6 ignition outputs and 5 analog inputs; B carries 2 ignition outputs, 2 trigger inputs and 2 knock inputs; AUX carries 1 CAN bus.

Show all 62 pins
PinFunction
A 19Injector 1 output (low side, current controlled)
A 20Injector 2 output
A 21Injector 3 output
A 22Injector 4 output
A 27Injector 5 output
A 28Injector 6 output
A 3Ignition 1 output (logic signal to igniter)
A 4Ignition 2 output
A 5Ignition 3 output
A 6Ignition 4 output
A 7Ignition 5 output
A 8Ignition 6 output
A 31Stepper 1 phase 1 or DPO (hi/low side 1A)
A 32Stepper 1 phase 2 or DPO
A 33Stepper 1 phase 3 or DPO
A 34Stepper 1 phase 4 or DPO
A 14AVI 10 analog input (suggested TPS)
A 15AVI 9 analog input (suggested MAP)
A 1DPO 2 (low side, 1A, 5V pull-up)
A 2AVI 4 analog input (1k pull-up switchable)
A 9+5V sensor supply (100mA)
A 10Battery ground
A 11Battery ground
A 12+8V sensor supply (1A)
A 1312V ignition switch input
A 16AVI 2 analog input
A 17AVI 3 analog input
A 18DPO 1 (low side, 1A, 0-12V selectable pull-up)
A 23DPO 3 (low side, 1A, 12V pull-up)
A 24DPO 5, fuel pump relay trigger
A 25DPO 6, engine control relay output
A 26Injector/DBW/stepper supply input (needed for ECU to run)
A 29Injector 7 output
A 30Injector 8 output
B 1Crank (trigger) + input, VR or Hall
B 2Cam (home) + input, VR or Hall
B 3AVI 7 analog input (suggested air temp)
B 4AVI 8 analog input (suggested coolant temp)
B 5Crank (trigger) - input (VR return)
B 6Cam (home) - input (VR return)
B 7SPI 4 pulsed input
B 8SPI 1 pulsed input (VR or digital)
B 9SPI 2 pulsed input
B 10SPI 3 pulsed input
B 11+12V switched ECU supply from ECU relay (also feeds sensors)
B 12AVI 6 analog input, narrowband O2 capable
B 13AVI 1 analog input, narrowband O2 capable
B 14Signal ground (sensors only)
B 15Signal ground
B 16Signal ground
B 17Ignition 7 output
B 18Ignition 8 output
B 19DPO 4 (low side, 1A)
B 20AVI 5 analog input
B 21Knock sensor 1 input
B 22Knock sensor 2 input
B 23CAN high (Haltech/vehicle CAN, ISO 11898)
B 24CAN low
B 25DBW 1 half-bridge / DPO (5A peak)
B 26DBW 2 half-bridge / DPO (5A peak)
AUX CAN2-HAuxiliary CAN 2 High
AUX CAN2-LAuxiliary CAN 2 Low

Other Haltech ECUs

The closest Haltech unit is the Haltech Elite 2000. Against it, this one has 1 drive-by-wire channel (the Elite 2000 has none).

Source: Haltech documentation for the Elite 2500

Always verify against the manufacturer's manual and your tuner before wiring.

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