Why this step comes first
A freshly wired car has dozens of connections that haven't been proven yet. If the ECU powers up with injectors and ignition live and the setup is wrong, it can spray fuel into the cylinders or fire coils at the wrong time. So on the first power-up, the only goal is to confirm the ECU is alive and talking, with nothing connected that can do harm.
How to do it
- Leave the ignition and injectors disconnected. Unplug the coils or igniters, and unplug the injectors or pull their fuse. See disconnect ignition and disable injectors.
- Switch the ignition on. Don't crank.
- Confirm the ECU has powered up. If it doesn't, check the fuses and relays that feed it, and the main ground at the engine and chassis.
- Connect your laptop and go online with Elite Software Programmer (ESP). If you can't connect, check the USB cable and driver first. See going online with the software.
Then configure it
If the ECU isn't set up for your engine yet, now is the time to do it, before going any further. That means engine type, triggers, fueling and ignition settings, or loading a suitable Elite base map. Only once the configuration is in place should you move on to checking sensors.
While you're online, watch battery voltage in ESP with the key on. It should sit close to the battery's resting voltage. A noticeably lower reading usually points to a poor ground or a weak power feed. Our guide to ECU grounding covers what to look for.
