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Daihatsu Hijet Efse Ecu Pinout Hot =link= -

Disclaimer: The ECU pinouts for engine swaps (especially for Kei-truck engines like the EF-SE) can vary significantly based on the specific vehicle model year, the specific ECU part number, and whether the harness is from an automatic or manual transmission vehicle. Always verify these pins with a multimeter and your specific ECU part number before connecting power to prevent damage.

Here is the technical data for the standard Daihatsu EF-SE (EF-DET/EF-ES) ECU pinout, commonly used in Hijet trucks (S80/S81/S82/S100/S110 chassis) from roughly 1992–1999.

6. If you already have damage or no-start:

Critical Wiring Notes ("Hot" Wiring Tips)

If you are wiring this "hot" (standalone swap) without a factory harness:

  1. Main Power Loop:

    • Pin 23 (Red) and Pin 26 (Red/Blue) require Constant +12V from the battery.
    • Pin 1 (Black/White) requires Switched +12V from the ignition key.
    • Pin 21 (Black) must be grounded securely to the engine block or chassis. Without a good ground, the ECU will not fire.

  2. Fuel Pump Control:

    • Pin 25 outputs a Ground signal to trigger the fuel pump relay. Do not wire the fuel pump power directly through the ECU; it only triggers the relay.

  3. Ignition System:

    • This ECU usually drives an external ignition coil or ignition module.
    • Pin 24 sends the trigger signal to the ignition module/coil.
    • Ensure the distributor is grounded correctly, as the ECU relies on the signal ground (Pin 19).

The Daihatsu Hijet EF-SE ECU pinout is a specialized technical reference used primarily for troubleshooting engine issues or performing swaps in S200 and S210 model series trucks. While "hot" likely refers to "hotwiring" or addressing an overheating ECU, there is no official product by this exact name; rather, it refers to the high demand for pinout data to solve electrical failures. ECU Overview & Function

The EF-SE engine utilizes an Electronic Fuel Injection (EFI) system controlled by an ECU (often a Denso unit) that manages critical functions like fuel delivery and ignition timing.

Location: Typically accessed by removing the glove compartment or located near the cowl on the passenger side.

Common Connectors: Often features two plugs (e.g., a 26-pin and a 16-pin configuration). Critical Pinout Reference (EF-JL/EF Series)

For models like the S200 series, technicians look for these specific "hot" (power) and ground pins to diagnose "no start" conditions: Power (+B1, +B2): Main battery power supply to the ECU.

Ground (E01, E02, E03): Essential for closing the circuit; faulty grounds often cause the ECU to run "hot" (thermally) due to resistance. daihatsu hijet efse ecu pinout hot

Sensors: Key pins include THW (Water Temp), PIM (Pressure Intake Manifold), and IDL (Idle). Review of Resources

English Electrical Service Manual (S200P): Highly recommended by mechanics. It covers EF-SE engines specifically and provides color-coded wiring guides that make troubleshooting roughly 90% of Hijet electrical issues significantly easier.

Live To Dai Community: A vital crowdsourced resource for specific pin maps, though users must verify their specific ECU part number (e.g., 89560-87213) as layouts vary by year and market. Troubleshooting "Hot" ECU Issues

If your ECU is physically hot to the touch or failing under heat:

Check for Voltage Spikes: Often caused by faulty alternators or short circuits in the loom.

Verify Grounds: Corroded ground wires increase electrical resistance, which generates heat.

Sensor Failure: A shorted sensor (like a MAP or O2 sensor) can feed excessive current back to the ECU. Common Causes of ECU Communication Failure

Voltage Spikes from Electrical System These spikes can result from a variety of sources, such as alternator issues, faulty wiring, Monte Tuning How to Diagnose a No Communication with the ECU?

The following layout is based on common EF-series ECU configurations (22-pin and 12-pin or 26-pin and 16-pin variants). Live To Dai Typical Voltage/Condition Main Power Supply Battery Voltage (Ignition ON) ECU Earth/Ground 0 Volts (All times) Manifold Absolute Pressure (MAP) 3.2 – 3.8V (Ignition ON, Engine OFF) Water Temp Sensor Signal varies with temperature Intake Air Temp Sensor Signal varies with temperature Sensor Reference Voltage Typically 5V Oxygen Sensor 0 – 1V oscillating Idle Switch (Throttle) < 1.0V (Throttle closed) Vehicle Speed Sensor Pulses while vehicle is moving Starter Signal Battery Voltage (Cranking only) Key Diagnostic Terminals W (Check Engine Light):

This terminal grounds the MIL lamp circuit to illuminate the "Check Engine" light. T (Test Terminal):

When shorted to ground (E1), it triggers the ECU to flash diagnostic codes via the dashboard light. VF (Monitor Terminal): Disclaimer: The ECU pinouts for engine swaps (especially

Used with professional scan tools to read real-time ECU data and fuel trim status. Wiring Precautions

When working on your Hijet's ECU wiring, follow these safety steps: Battery Disconnect:

Always disconnect the negative battery terminal before unplugging the ECU to prevent voltage spikes. Connector Handling:

Do not pull on the wires themselves; press the locking lever and pull the plastic housing. Moisture Protection:

Ensure the ECU cover and seals are intact, as the Hijet's under-seat engine placement can expose the unit to moisture.

For more detailed diagrams, you can find manual resources on sites like or technical forums such as Live To Dai Are you planning to install an aftermarket gauge troubleshoot a specific sensor EF Engine ECU Pinouts - DIY or TECHNICAL - Live To Dai

EF-JL ECU ・ 1-26 Pins – Plug 2-16 Pins) Plug 1 (26 Pin) #1 Pin Top Left pin from loom plug perspective ・ 12- E01. 13- IG. 26- E03. Live To Dai EF Engine ECU Pinouts - DIY or TECHNICAL - Live To Dai

Daihatsu Hijet EF-SE engine ECU pinout typically involves two or three connectors, depending on the specific model year and market (JDM vs. export). For standard S200 and S210 series Hijets, the ECU manages the SOHC 6-valve engine's electronic fuel injection (EFI) and ignition. Google Books Common ECU Pin Functions (EF-Series)

While exact numbering varies by ECU part number (such as 89560-97543), the following core pins are standard across most EF-engine EFI systems: Live To Dai Power & Ground : Switched power from the EFI relay. : Constant battery power (12V) for memory. E1 / E01 / E02 : Main chassis grounds for the ECU and power circuits. : Sensor ground (common for TPS and coolant sensors). Inputs (Sensors) : 5V reference power supplied to sensors. : Manifold Absolute Pressure signal. : Coolant temperature sensor input. : Intake air temperature sensor input. : Oxygen sensor signal.

: Throttle position sensor (TPS) idle and power enrichment signals. : Engine speed (crankshaft or distributor) signal. Outputs (Actuators) : Fuel injector control (often grouped). : Ignition trigger/coil control. : Idle speed control valve. : Fuel pump relay control. : Check engine light (MIL) output. Diagnostic Access

For troubleshooting "hot" electrical issues or sensor failures, you can often bridge terminals Check fuses (EFI, ECU, IGN, Main relay) Check

on the diagnostic connector to read blink codes on the dashboard.

Detailed diagrams for specific chassis (e.g., S200P, S210P) are available in the Daihatsu Hijet English Electrical Service Manual or through technical communities like Live To Dai pin numbering for a 2-plug or 3-plug connector layout? EF Engine ECU Pinouts - DIY or TECHNICAL - Live To Dai

Here’s a forum-style post tailored for someone searching for the Daihatsu Hijet EFSE ECU pinout (likely chasing a hot start or wiring issue). You can post this on a minitruck forum, Facebook group, or technical blog.

Title: Daihatsu Hijet EFSE ECU Pinout / Wiring Diagram (Hot Start & No-Start Help)

Posted by: [Your Name] Vehicle: Daihatsu Hijet (S85 / S83 / S110 chassis) – EFSE engine (carbureted 550cc)

TL;DR: Looking for the ECU pinout for a Daihatsu Hijet EFSE. Having a hot start issue – cranks fine when cold, but once warmed up, no spark or no fuel until it cools down. Need to check sensors & power feeds.

The Problem – Hot Start / Heat Soak If you’re reading this, you might have the classic EFSE hot restart failure:

Common culprits on EFSE:

Typical ECU connector arrangement

What is the Daihatsu EFSE Engine?

Before diving into the wiring diagram, let’s establish context. The EFSE engine is a liquid-cooled, inline-3 cylinder, 12-valve SOHC unit found in Hijet vans and trucks from the late 1990s to early 2000s (specifically the S83 chassis). It utilizes electronic fuel injection (EFI) managed by a Denso ECU (typically part numbers beginning with 89661-...).

Unlike carbureted Hijets, the EFSE relies entirely on sensors and actuators. If the ECU loses power, ground, or a critical 5V reference, the vehicle is a brick.

Step 2: Check 5V Reference

Final Checklist: No Start / No "Hot" Power

If your Daihatsu Hijet EFSE is dead, follow this flowchart using the pinout above:

  1. Check Pin B1 (Constant 12V) β†’ No? β†’ Check battery terminal and 15A EFI fuse.
  2. Check Pin B3 (Switched 12V with Key ON) β†’ No? β†’ Check EFI main relay and ignition switch.
  3. Check Pin B2 (Ground) β†’ No? β†’ Clean grounding bolt on intake manifold.
  4. Check Pin C1 (5V Reference) β†’ No? β†’ Unplug all sensors (MAP, TPS, Cam). If 5V returns, one sensor is dead.
  5. Check Pin D4 (Ignition signal while cranking) β†’ Flashing 0-12V? β†’ No? β†’ Crankshaft position sensor is suspect.

Part 3: β€œHot” Diagnostic Troubleshooting Flow

When your Hijet runs perfectly cold but stumbles, stalls, or refuses to restart when hot, follow this systematic procedure using the pinout above.

Example pin map (example only β€” confirm on your ECU)

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