What's on the 26-pin plug
The Elite 1500 uses a 26-pin and a 34-pin main connector. The 26-pin plug is the "signal" side of the ECU: it takes the crank and cam signals, the main temperature and O2 inputs, pulsed inputs such as wheel speed, a knock input, CAN, and the two drive-by-wire outputs. It also carries one of the main 12V feeds. The companion plug is covered in Main Connector 34 Pin (Elite 1500).
We've grouped the pins below by job rather than pin order, since that's how you'll usually be looking for them. "Shielded" means the wire is part of a shielded cable in Haltech's harness.
Trigger inputs
| Pin | Function | Wire color | Notes |
|---|---|---|---|
| 1 | Crank (Trigger) positive | Yellow, shielded | Works with reluctor or digital (Hall/optical) sensors |
| 5 | Crank (Trigger) negative | Green, shielded | Reference return, used with reluctor sensors |
| 2 | Cam (Home) positive | Yellow, shielded | Works with reluctor or digital sensors |
| 6 | Cam (Home) negative | Green, shielded | Reference return, used with reluctor sensors |
Trigger and home use the same colors, so label them before they leave the loom. With a digital sensor, the negative pin isn't normally needed; the sensor grounds to signal ground instead.
Analog voltage inputs (AVI)
| Pin | Function | Wire color | Notes |
|---|---|---|---|
| 3 | AVI 7, air temp | Grey | 0-5V; 1k pull-up can be switched on in software |
| 4 | AVI 8, coolant temp | Violet | 0-5V; 1k pull-up can be switched on in software |
| 20 | AVI 5 | Orange/green | 0-5V general input; switchable 1k pull-up |
| 12 | AVI 6, O2 input 1 | Grey/orange, shielded | 0-5V; suits a narrowband O2 sensor |
| 13 | AVI 1, O2 input 2 | Grey/yellow, shielded | 0-5V; suits a narrowband O2 sensor |
The switchable pull-up is what makes the temperature inputs work with two-wire thermistor sensors like a coolant temp sensor: turn it on for those, and leave it off for powered sensors. The O2 inputs are for narrowband sensors; for tuning you'll want a wideband over CAN.
Pulsed inputs (SPI)
| Pin | Function | Wire color | Notes |
|---|---|---|---|
| 8 | SPI 1 | Grey, shielded | Up to 50 kHz; tolerates up to 25V DC |
| 9 | SPI 2 | Grey/black, shielded | Up to 50 kHz; tolerates up to 25V DC |
| 10 | SPI 3 | Grey/brown, shielded | Up to 50 kHz; tolerates up to 25V DC |
| 7 | SPI 4 | Grey/red, shielded | Up to 50 kHz; tolerates up to 25V DC |
SPIs are where wheel speed, driveshaft speed, flex fuel and other frequency signals usually go.
Power and grounds
| Pin | Function | Wire color | Notes |
|---|---|---|---|
| 11 | ECU supply, +13.8V | Red/white | Main 12V feed into the ECU |
| 14, 15, 16 | Signal ground | Black/white | Ground reference for sensors only |
Signal ground is a reference, not a power ground. Only sensor grounds go here. Solenoids, relays, lights and anything else that carries real current should ground elsewhere, or the noise will show up in your sensor readings. See Power and Ground Wiring.
Knock, CAN and outputs
| Pin | Function | Wire color | Notes |
|---|---|---|---|
| 21 | Knock 1 | Grey/green | For piezoelectric knock sensors |
| 23 | CAN high | White | ISO 11898; can be set to the Haltech or vehicle bus |
| 24 | CAN low | Blue | ISO 11898; can be set to the Haltech or vehicle bus |
| 19 | DPO 4 | Violet/orange | Switches to ground, 1A max; has a fixed 12V pull-up |
| 25 | DBW 1 / DPO | Brown/black | 5A peak, 1A average, up to 100 kHz |
| 26 | DBW 2 / DPO | Brown/red | 5A peak, 1A average, up to 100 kHz |
Pins 17, 18 and 22 are unused.
The two DBW pins form the H-bridge that drives an electronic throttle motor. If you're not running drive-by-wire, they can be used as general purpose outputs, which is handy on a cable-throttle build. For throttle setup, see Elite 1500/2500 DBW wiring information, and for dashes, wideband controllers and keypads, see the CAN communications wiring guide.
Wiring tips from the shop
- Keep shielded cables shielded right up to the sensor connector, and don't let the shield touch the sensor end.
- Twist CAN high and low together, and make sure the bus is terminated correctly at each end.
- Don't exceed 1A on DPO 4. Use a relay for anything bigger, like fans or pumps.
- If you're building your own loom, the Elite 1500 plug and pin set gives you the correct connectors and terminals.
FAQ
Is the 26-pin pinout the same on the Elite 2500?
Not necessarily. The 2500 has its own documentation; check Main Connector 26 Pin (Elite 2500) rather than assuming.
Can I use the O2 inputs for a wideband?
They're intended for narrowband sensors. A CAN wideband controller is the better way to bring lambda into an Elite. For the full install walkthrough, see the Elite 1500/2500 quick start guide.
