Daihatsu Hijet Efse Ecu Pinout Hot __full__ Site

Daihatsu Hijet (EF-SE) ECU Pinout — Hot Side (Power/Ignition/Outputs)

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.

Quick diagnostic steps (hot-side focus)

  1. Check battery voltage at battery terminals (12.4–12.8V idle).
  2. With key OFF, probe ECU BAT pin(s) for constant 12V (fuse-protected).
  3. Turn key to ON (do not start): probe IGN/IG pin for +12V. If absent, check ignition fuse/IG relay.
  4. While turning to START, probe ST pin for +12V only during cranking.
  5. Check main EFI relay click and measure +12V on relay-switched pins (injector supply, fuel pump feed).
  6. If fuel pump doesn’t run, check FP pin at ECU and continuity to pump/relay.
  7. Verify ECU ground(s) for low resistance to chassis (<0.5Ω preferable).
  8. If ECU has memory issues, loss of VIN/config, verify constant BAT pin and backup power fuse.

Hot Start Quick Checks (Before replacing ECU)

  1. Next time it won't restart hot:

    • Check for spark immediately (pull a plug wire, ground to engine).
    • If no spark → igniter or coil.
    • If spark present → check fuel (crack injector line or listen for pump).

  2. Igniter test (common failure):

    • Pour cold water on the igniter (mounted near coil on firewall or strut tower).
    • If it starts right away, replace the igniter (Daihatsu part # or aftermarket like a universal Mitsubishi igniter).

  3. Coolant temp sensor:

    • Measure resistance cold vs hot.
    • Cold: ~2–3k ohms. Hot (operating temp): ~300–400 ohms.
    • If sensor reads open or very high when hot, ECU thinks engine is cold and floods it – or won't fire.

Common EFSE ECU Locations