Daihatsu Hijet Efse Ecu Pinout Hot May 2026

If you own a Daihatsu Hijet (S85, S86, S100, or S110 chassis) equipped with the legendary EFSE 650cc inline-3 cylinder engine, you already know the struggle. This little kei truck is a workhorse, but when things go wrong, they often go wrong while the engine is hot —that is, at operating temperature or under load.

Search for “EFSE ECU connector view diagram” or join the Daihatsu Hijet Owners Facebook group for community-sourced wiring corrections. Disclaimer: Always disconnect the battery before probing ECU pins. Use a high-impedance multimeter (10MΩ) to avoid damaging the 5V circuit. This guide applies to EFSE engines in Hijet models with 36-pin Denso ECUs – verify your connector style before probing. daihatsu hijet efse ecu pinout hot

| | Check Pin(s) | Expected Hot Value | |------------------|----------------|------------------------| | No fuel pump prime | 4 (Main relay), 23 (Fuel pump) | Ground (0V) during crank | | Cranks, no spark | 15 (IGT), 16 (IGF) | 5V pulses | | Runs rich, black smoke | 13 (Coolant), 10 (MAP) | C Temp: <1V, MAP: 1.5V idle | | No 5V to sensors | 26 (Ref), 9 (Return) | 5V ±0.15V | | Erratic tach | 6 (Tach out) | ~6V square wave | | Intermittent dying | 24, 25 (Power grounds) | <0.1V drop to battery | Conclusion The Daihatsu Hijet EFSE ECU pinout is more than a wiring diagram—it is a survival guide for keeping these charismatic kei vehicles on the road, especially when they are hot . Focus your efforts on the 5V reference, power grounds (E01/E02), and coolant temperature sensor signal. If you experience a heat-related failure, remember: capacitors are cheap, and Toyota’s old Denso ECUs can be repaired. If you own a Daihatsu Hijet (S85, S86,

For serious performance builds, consider a standalone ECU, but always keep a copy of this pinout handy. Your Hijet’s little three-cylinder heart depends on it. Disclaimer: Always disconnect the battery before probing ECU