Pinout Hot: Daihatsu Hijet Efse Ecu

The Daihatsu Hijet EF-SE engine uses a Electronic Fuel Injection (EFI) system where the Engine Control Unit (ECU) manages fuel delivery and ignition timing based on various sensor inputs.

Because the Hijet has many variations (S100, S110, S200, etc.), pinouts can vary. However, common "hot" (power) and critical pins for the EF-series engines typically include: Common "Hot" & Power Pins

+B / +B1 (Main Power): This pin provides switched battery voltage when the ignition is in the "ON" position.

BATT (Constant Power): This pin is "always hot" and provides constant battery voltage to maintain the ECU's internal memory (DTC storage) even when the ignition is off.

IG / IG2 (Ignition Signal): Receives a signal from the ignition switch to "wake up" the ECU.

E1 / E01 (Grounds): These are the primary chassis grounds for the ECU.

Daihatsu EJ-VE Engine ECU Manual | PDF | Throttle | Ignition System

ECU Pinout – Daihatsu Hijet EFSE (Main 36‑pin connector)

| Pin | Wire Color | Function | Notes (Hot = live voltage/trigger) | |------|------------|------------------------|--------------------------------------------| | 1 | Black/Yellow | +12V Battery (constant) | Main ECU power | | 2 | Black/White | Ground (sensor return) | Sensor ground | | 3 | Black/Red | Ground (power ground) | ECU main ground | | 4 | Yellow/Black | Injector (+) | 12V from main relay (hot in RUN/START) | | 5 | Blue/Red | Ignition signal (igniter) | From distributor pickup | | 6 | Green/White | TPS signal (throttle position) | 0.5V – 4.5V | | 7 | Red | Check Engine Light (CEL) | Switched ground to lamp (active low) | | 8 | Green/Black | Fuel pump relay control | Grounds relay to turn pump on | | 9 | Yellow/Green | Coolant temp sensor | Resistance to ground | | 10 | White/Red | Intake air temp (IAT) | Resistance to ground | | 11 | Blue/White | MAP sensor signal (manifold pressure) | ~1.5V idle, ~4V WOT | | 12 | Yellow | Power steering input (if equipped) | 12V when steering load | | 13 | Black/White | Ground (sensor return) | | | 14 | Black | Ground (power ground) | | | 15 | Black/Yellow | +12V (main relay feed) | | | 16 | Green/Red | Injector trigger (ground side) | ECU pulses ground | | 17 | Red/Blue | Ignition timing adjustment (diagnostic) | Jumper to ground to set base timing | | 18 | White/Black | Tachometer output | To cluster / diagnostic | | 19 | Blue | Distributor NE (crank position) | Primary crank signal | | 20 | Yellow/Blue | Distributor G (cylinder identification) | Sync signal | | 21 | White/Green | Starter signal (from ignition switch) | 12V in START (hot crank) | | 22 | Red/Black | Alternator L terminal sense | | | 23 | Green | VSS (vehicle speed sensor) | 4 pulses per meter (reed switch) | | 24 | – | Not used | | | 25 | Blue/Red | O2 sensor signal (if equipped) | 0.1–0.9V | | 26 | Red/Yellow | A/C request input | 12V from A/C switch | | 27 | Black/Yellow | +12V (ignition switch – RUN/START) | Hot in RUN/START | | 28 | Black/White | Ground (ECU case ground) | | | 29 | White/Red | ISC valve (idle speed control) – coil 1 | | | 30 | White/Black | ISC valve – coil 2 | | | 31 | Red/Green | EGR control solenoid (if equipped) | | | 32 | Green/Yellow | Purge VSV (evap) | | | 33 | Red | Diagnostic terminal (Check connector) | STI – test mode | | 34 | White | Diagnostic data output (MIL flash code) | | | 35 | Black/Red | +5V sensor reference | To MAP, TPS, coolant temp | | 36 | Black/Green | Ground (sensor return) | |

Part 6: Pinout Quick Reference Table (Hot Cheat Sheet)

Keep this printed in your glovebox:

| Symptom (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 |

Part 1: Understanding the Daihatsu EFSE ECU Architecture

The Daihatsu EFSE engine uses a proprietary ECU manufactured by Denso (part numbers often starting with 89661-xxxxx). It is a speed-density system (MAP sensor based) with a distributor ignition and batch-fire fuel injection.

Key Specifications:

Engine: EFSE (658cc, 3-cylinder, 4-stroke)
ECU Type: 36-pin (two rows of 18 pins, often labeled A and B on the connector body)
Triggering: Distributor with internal 24-tooe crank position sensor and 1-degree cam sync
Fuel: Batch fire (all three injectors fire simultaneously once per engine cycle)

Mastering the Daihatsu Hijet EFSE ECU Pinout: Diagnostics, Hot Wiring, and Sensor Breakdown

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.

Searching for the term "Daihatsu Hijet EFSE ECU Pinout Hot" typically means one of three things:

You are chasing an intermittent fault that only appears when the engine heat-soaks the ECU.
You are building a custom harness or standalone ECU (like a Haltech or Link) for a turbo or performance build.
Your Hijet cranks cold but dies or runs poorly once the temperature gauge climbs.

This article provides the complete 36-pin ECU pinout, explains which circuits are prone to heat-related failure, and offers advanced hot-wiring diagnostic procedures.

Critical Wiring Notes ("Hot" Wiring Tips)

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

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.
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.
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 equipped with the EF-SE engine (a 659cc, 3-cylinder, non-turbo SOHC unit) uses a specific Engine Control Unit (ECU) pinout configuration that is critical for engine swaps, diagnostics, or repairing electrical faults. Proper identification of these pins is essential to avoid shorting the system, which can blow the 15-amp engine fuse or damage the unit permanently. Core ECU Pinout Configuration (EF-Series) daihatsu hijet efse ecu pinout hot

For the EF-SE and similar EF-series engines, the ECU typically features a multi-pin connector arrangement. Common terminal designations found in technical documentation include: Pin Designation Function Description +B1, +B2 Main Power Supply (Switched 12V) E1, E2 System Ground (Earth) PIM Manifold Absolute Pressure (MAP) Sensor Input THW Water (Coolant) Temperature Sensor THA Intake Air Temperature Sensor OX Oxygen Sensor Signal SPD Vehicle Speed Sensor N+, N- Crankshaft/Camshaft Position Signal IDL Idle Switch (Throttle Position) AC Air Conditioning Signal/Relay Control Critical Wiring Differences: Series 1 vs. Series 2

A major pitfall for technicians is the change in wiring between different generations of the EF engine.

Series 1: Pin 10 is often used as a dedicated earth (ground).

Series 2: The alternator loom was merged into the fuel injector loom, and Pin 10 was repurposed as a 12V+ line.

Warning: Mixing these looms or ECU models without re-pinning will result in a direct short circuit. Performance & Troubleshooting Tips

Low RPM Issues: If your EF-SE suffers from poor response at low RPM or stalling when the A/C is on, it may be due to an incorrectly wired A/C relay or a faulty Vacuum Switching Valve (VSV) for the purge system, which helps stabilize the idle under load.

OBD Support: Some EF-SE models (like ECU A32 / 89560-B2460) may not support standard OBD-II protocols and require specific diagnostic tools or pin-jumping for blink codes.

Documentation Access: For complete schematics, technicians often refer to the Daihatsu Hijet English Electrical Service Manual or similar guides on Scribd.

Are you currently performing an engine swap or troubleshooting a specific sensor fault code on your Hijet? EF Engine ECU Pinouts - DIY or TECHNICAL - Live To Dai

EF Engine ECU Pinouts * E1. * VC. * PIM. * THW. * N+ * IDL. * SPD. * Blank. * Blank. * Blank. Live To Dai

Daihatsu Hijet (S200/S210 series) engine uses a specific Engine Control Unit (ECU) often identified by part numbers such as 89560-97543

. Detailed pinout data for this specific engine is found in the Daihatsu Hijet English Electrical Service Manual , which covers EF-SE, EF-VE, and EF-DET units. Common EF-SE ECU Pin Identifiers

While exact pin numbering can vary by year (e.g., 1999 vs. 2004), standard Daihatsu EF-series ECU connectors typically include the following critical terminals: Live To Dai : Engine Ground : Constant 5V supply to sensors : Intake Manifold Pressure Sensor signal : Water Temperature Sensor signal : Engine Speed/Crank Position signal : Idle switch signal : Vehicle Speed Sensor signal ECU Terminal Voltage Reference

For diagnostic purposes, standard voltage values at the ECU terminals under typical conditions (Ignition ON, Engine Stopped) include: auto-detal.ru Terminal Name Typical Measurement Condition Standard Voltage (V) Ignition ON Ignition ON Ignition ON 4.5–5.5V Technical Documentation & Resources

For a complete "paper" or PDF schematic, you can access detailed technical guides on platforms like Full Service Manual Daihatsu Hijet S200P S210P English Electrical Manual

contains over 280 pages of wiring color codes and connector guides. Wiring Overviews : General Daihatsu ECU wiring guides are available at Daihatsu Wiring and ECU Diagrams Body Electrical

: Component locations and harness layouts for the S80/S81 series (often similar in philosophy to the S200) can be found at Further Exploration Review the EF Engine ECU Pinouts Live To Dai for community-sourced terminal mappings. EFI System Diagnosis Guide for reading malfunction codes via the check engine light. Jdmfsm.info

for legacy Hijet S100-S140 manuals that provide context for EF-series engine evolution. Are you looking to troubleshoot a specific sensor or are you performing an engine swap EF Engine ECU Pinouts - DIY or TECHNICAL - Live To Dai

EF Engine ECU Pinouts * E1. * VC. * PIM. * THW. * N+ * IDL. * SPD. * Blank. * Blank. * Blank. Live To Dai EF Engine ECU Pinouts - DIY or TECHNICAL - Live To Dai The Daihatsu Hijet EF-SE engine uses a Electronic

EF Engine ECU Pinouts * E1. * VC. * PIM. * THW. * N+ * IDL. * SPD. * Blank. * Blank. * Blank. Live To Dai

Daihatsu Wiring and ECU Diagrams | PDF | Electrical Connector

The neon sign above “Sato’s Speed Shop” flickered, casting a rhythmic red glow over Kenji’s grease-stained hands. In the center of the garage sat a 1999 Daihatsu Hijet. It was a humble kei truck, but Kenji had swapped in a high-compression EF-SE engine, and tonight was the night it was supposed to scream.

The problem was the wiring. The engine cranked, but it wouldn't catch.

"The ECU is stone cold, Kenji," his partner, Hiro, muttered, leaning over the passenger seat where the engine control unit sat exposed. "No spark, no fuel pulse. You sure about that pinout?"

Kenji wiped his forehead, leaving a streak of black oil. "The manual I found is for the older EF-VE. This is the SE. The pins are mirrored, or worse."

He pulled up a blurry, archived forum post on his phone. The title was a beacon of hope: "EFSE ECU PINOUT HOT – FULL MAPPING."

"Look," Kenji pointed to the screen. "Pin 12 isn't the ground; it’s the ignition trigger. And Pin 24? That’s the main 12V feed from the EFI relay."

"If that's 'hot' and we've got it grounded..." Hiro trailed off, his eyes widening.

Kenji grabbed his multimeter. The shop was silent except for the hum of the city outside. He probed the connector. "Zero volts. We’ve been sending the power signal into a dead-end pin."

With steady hands, Kenji depinned the heavy gauge wire from the plastic housing. He clicked it into the correct slot—the 'hot' Pin 24. He did the same for the crank sensor signal and the injector drivers, following the "hot" map line by line. "Ready?" Kenji asked, stepping into the tiny cabin. "Clear!" Hiro shouted.

Kenji turned the key. For a heartbeat, there was only the whine of the fuel pump. Then, with a sharp, metallic bark, the EF-SE roared to life. The exhaust, still just an open header, spat a blue flame that illuminated the dark garage.

The ECU wasn't just "hot" on paper anymore; it was processing thousands of signals a second, vibrating with the rhythm of a machine reborn.

Hiro grinned through the smoke. "Guess that pinout was the real deal."

Kenji blipped the throttle, the tiny truck shaking with newfound aggression. "Not just a delivery truck anymore, Hiro. Now, it's a monster."

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) Part 6: Pinout Quick Reference Table (Hot Cheat

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.

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):

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) 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.