This is not a "12V hot" but a signal hot. The EFSE uses a magnetic reluctance sensor. If the air gap is wrong or the shield wire (pin C3 shield) is broken, you get no RPM signal.
If you are stranded with a hot ECU that refuses to power the main relay (Pin 4 no ground), you can force power:
If you describe exactly what problem you're trying to solve (e.g., "no injector pulse," "ECU not turning on," "no spark"), I can help you diagnose safely without a raw pinout. daihatsu hijet efse ecu pinout hot
Stay safe – car electronics can be unforgiving.
| Pin | Function | Notes | |------|---------------------|-----------------------------| | A1 | +12V Battery (main) | Always hot | | A2 | +12V Ignition (IG) | Hot in RUN/START | | A3 | Ground (ECU main) | To chassis/engine | | B4 | Coolant temp sensor | 2-wire sensor – critical for hot start | | B6 | Ignition signal (from igniter) | Or to igniter? | | C2 | Fuel pump relay control | Grounds relay coil | | C5 | Crank signal (distributor) | RPM signal | | C7 | TPS (if equipped) | Some EFSE have TPS, some don't | This is not a "12V hot" but a signal hot
Does anyone have the full pinout diagram? A photo of a factory wiring diagram page or a hand-drawn pin map would be huge.
Below is an organized, actionable reference for the EFI-type Daihatsu Hijet with the EF-SE engine ECU pinout focusing on the “hot” side: power inputs, ignition-switched feeds, fused supplies, and power-switched outputs that remain energized when key is ON or in START. Use this for diagnostics, wiring repair, or adding accessories. Assume left/right connector orientation when facing the ECU; verify with your vehicle wiring diagram and meter before applying power. If you describe exactly what problem you're trying
If you are a qualified technician or experienced DIY mechanic, here is the safe way to proceed:
| Condition | Pins that become hot (12V) | |-----------|----------------------------| | Battery connected, key OFF | Pin 1 (constant), Pin 15 (main relay feed) | | Key ON (RUN) | Pin 27 (+12V ignition), Pin 4 (injector 12V) | | Key START | Pin 21 (starter signal) – hot only while cranking | | Engine running | Pin 8 (fuel pump – ground trigger, not 12V, but activates relay), Pin 20 (distributor sync) |
⚠️ Injector signal (Pin 16) is pulled to ground by ECU, not hot. Use a noid light or oscilloscope.