Back-probe the connector with a sewing needle and confirm the voltage or continuity matches the function before assuming the color code is correct. Corrosion in the EF-SE engine bay harness is notorious for turning black wires green.
| Pin | Wire Color | Function | Notes | |------|------------|-----------------------------|----------------------------------| | | B/Y | +12V Battery (Main) | Constant power | | A2 | B/R | +12V Ignition Switch (IG) | Powers ECU when key is ON | | A3 | B/W | Main Relay Control | Switches EFI relay | | A4 | R | Fuel Pump Relay Control | Grounds to turn on pump | | A5 | B | Ground (Power) | ECU main ground | | A6 | B | Ground (Sensor) | Sensor ground | | A7 | Lg/R | Check Engine Light | Switched ground | | A8 | G | Tachometer Signal | To instrument cluster | | B1 | Y/B | Injector #1 | | | B2 | Y/G | Injector #2 | | | B3 | Y/R | Injector #3 | | | B4 | W | Ignition Output (IGT) | To igniter | | B5 | Lg | Distributor Crank Signal (Ne) | Timing rotor | | B6 | Lg/R | Distributor G Signal (G1) | Cylinder identification | | B7 | Lg/W | Distributor G Signal (G2) | | | B8 | R/W | Throttle Position Sensor (VTA) | 0-5V signal | | B9 | G/R | Intake Air Temp (THA) | | | B10 | B/Y | Coolant Temp (THW) | | | B11 | W/B | O2 Sensor Signal | | | B12 | B/Lg | VSV (EGR or Purge) | | daihatsu hijet ef-se ecu pinout
Before diving into the pinout, it is critical to understand what you are working with. The EF-SE engine is not your grandfather's carbureted kei engine. It features: Back-probe the connector with a sewing needle and
Warning: The stock Daihatsu igniter requires a 5V square wave from the ECU on B7 (IGT). Do not send a 12V signal there – you will destroy the igniter. The EF-SE engine is not your grandfather's carbureted