Let me set the scene for you.

You fold the diagram, edges tearing a little more. You’ll laminate it someday.

Your buddy turns the key. The engine catches on the third crank, stumbles, then smooths out to a lumpy idle. Exhaust smells like a chemistry experiment, but you don’t care.

Pin 16 → Light Green/Red → Injector #1. That’s interesting. No pulse?

“Ignition or injectors,” you mutter, like you’ve seen your uncle do a hundred times.

It’s your Rosetta Stone. You spread the printout over the fender, holding the edges down with a 10mm socket (the one you haven’t lost yet) and a half-empty bottle of water. The diagram is a labyrinth: lines crossing lines, little numbers in circles, connector shapes that look like someone sneezed while drafting. There’s for engine room main junction, E for earth points, I for instrument cluster.

You’d walked past that relay ten times today, assuming it was fine because you heard click . But the diagram shows something subtle: the EFI relay has two outputs. One powers the ECU. The other powers the injectors and fuel pump via a .

You pull the glovebox. There it is: a silver finned thing, like a mini heatsink. You test for voltage on the brown wire at the resistor pack input. 12V. Good. Output side to injectors: 0V.