How to read this pinout
Pin numbers are exactly as Haltech lists them, but we've grouped them by what they do, because that's how you'll check them when a car won't start. Wire colors use Haltech's abbreviations, first color is the main insulation and second is the stripe:
B black, BR brown, G green, L blue, O orange, P pink, R red, V violet, W white, Y yellow. So Y/B is yellow with a black stripe.
This covers the 34-pin plug only. The matching 26-pin main connector carries the rest of the Elite 1500's I/O.
Power and ground: check these first
| Pin | Color | Function | What to know |
|---|---|---|---|
| 10 | B | Battery ground | Run straight to the battery negative post |
| 11 | B | Battery ground | Second ground, also to battery negative |
| 13 | P | 12V ignition input | Must be live with the key on and while cranking |
| 26 | R/L | ECU injector power input | 12V from the injector power relay. The ECU will not run without it |
Pin 26 isn't optional. If the Elite powers up and talks to the laptop but won't fire injectors or run, check for 12V on pin 26 during cranking before anything else. Our grounding guide covers the ground side of the same problem.
Sensor supplies
| Pin | Color | Function | Limit |
|---|---|---|---|
| 9 | O | 5V sensor supply | 100 mA maximum |
| 12 | O/W | 8V sensor supply | 100 mA maximum |
100 mA is plenty for pressure sensors and a throttle position sensor, but it isn't a power feed for accessories. If a sensor supply gets shorted to ground, every sensor on it goes wrong at once, which is a good clue when several readings fail together.
Injector drivers
| Pin | Color | Function |
|---|---|---|
| 19 | L | Injector 1 |
| 20 | L/B | Injector 2 |
| 21 | L/BR | Injector 3 |
| 22 | L/R | Injector 4 |
All four are current-controlled drivers, adjustable up to 8 A peak and 2 A hold. That's what lets the Elite 1500 run low-impedance injectors without external resistors. Set the peak and hold values to suit your injectors in the software.
Ignition outputs
| Pin | Color | Function |
|---|---|---|
| 3 | Y/B | Ignition 1 |
| 4 | Y/R | Ignition 2 |
| 5 | Y/O | Ignition 3 |
| 6 | Y/G | Ignition 4 |
Each is rated at 1 A. They're meant to trigger coils with a built-in igniter or an external igniter module, not to switch a coil's primary current directly.
Analog inputs (AVIs)
| Pin | Color | Input | Usual job |
|---|---|---|---|
| 14 | W | AVI 10 | Throttle position |
| 15 | Y | AVI 9 | Manifold pressure |
| 16 | O/B | AVI 2 | Spare |
| 17 | O/R | AVI 3 | Spare |
| 2 | O/Y | AVI 4 | Spare |
All five read 0 to 5 volts and have a 1k pull-up resistor you can switch on in software. Turn the pull-up on for two-wire temperature sensors and off for powered sensors such as pressure transducers.
Digital pulsed outputs (DPOs)
| Pin | Color | Output | Pull-up |
|---|---|---|---|
| 18 | V/B | DPO 1 | User definable |
| 1 | V/BR | DPO 2 | Fixed, to 5V |
| 23 | V/R | DPO 3 | Fixed, to 12V |
| 24 | B/Y | DPO 5, fuel pump trigger | Fixed, to 12V |
| 25 | B/R | DPO 6, engine control relay | Fixed, to 12V |
These switch to ground and handle up to 1 A. That is enough for relay coils, shift lights and small solenoids. For anything that draws more, drive a relay. The pull-up only matters when the output is used as a signal, such as a tacho feed, where the receiving device needs to see a voltage when the output is off.
Stepper motor outputs
| Pin | Color | Function |
|---|---|---|
| 31 | G | Stepper 1, phase 1 (or DPO) |
| 32 | G/B | Stepper 1, phase 2 (or DPO) |
| 33 | G/BR | Stepper 1, phase 3 (or DPO) |
| 34 | G/R | Stepper 1, phase 4 (or DPO) |
These four can drive a stepper idle motor, or each can be used on its own as an output. They can both source and sink current, up to 1 A. If your engine uses a PWM idle valve instead, they're free for other jobs.
Unused pins
Pins 7, 8, 27, 28, 29 and 30 have no connection on the Elite 1500.
Where to go next
- The Elite 1500 overview and quick start guide for the full setup.
- Our 34-pin harness notes if you're working with a Haltech harness rather than bare pins.
- Building your own loom? The Elite 1500 plug and pin set or the premium universal harness kit.
Stuck on a wiring fault? Book a free 30-minute consultation and we'll go through it with you.
