These serve as the high-current dump grounds for the fuel injectors and ignition coils. A high resistance reading here (>0.5 Ohms to the negative battery terminal) causes weak ignition spark and fuel delivery failure. Diagnostic Jumper Subsystem (OBD-1 Code Reading)
If your Hijet cranks but fails to start, the issue usually stems from a loss of reference power or primary grounding:
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."
If the THW sensor (connected to the THW pin on the ECU) reads incorrectly due to heat soak, the ECU injects too much fuel (choke) into a hot engine. daihatsu hijet efse ecu pinout hot
Connect a jumper wire between and Plug 1, Pin 1 (E1) . Turn the vehicle ignition to the ON position.
For most (like the EF-SE found in S200 Hijets), the power terminals are located as follows:
The following structural mapping represents the breakdown found in the Daihatsu Hijet English Electrical Service Manual for standard EF-series EFI control units. Terminal Function Type Voltage / Signal Parameters Core Automotive Component Connection Main System Power Continuous 12V Battery Power EFI Main Relay Output / Ignition Switch BATT Continuous Backup Power Unswitched 12V Battery Fuse Box Memory Loop Line E1 / E2 System Hardware Grounds 0.0V Solid Ground Chassis Earth / Sensor Shield Ring PIM Manifold Absolute Pressure Analog Linear Voltage (0–5V) MAP Sensor Signal Input THW Engine Coolant Temperature Variable Resistive Voltage Water Thermo Sensor Line THA Intake Air Temperature Variable Resistive Voltage Air Filter Duct Temperature Element OX Exhaust Lambda Stream Oscillating Voltage (0.1–0.9V) Heated Oxygen Sensor (O2 Sensor) N+ / N- Engine Rotational Velocity Digital/AC Square Wave Frequency Crankshaft/Camshaft Position Sensor IDL Throttle Idle Verification Binary Low/High Logic Throttle Position Switch Circuit #10 / #20 Fuel Metering Actuation Ground-Side Switched Pulses Fuel Injector Solenoid Coils IGT Electronic Ignition Advance Digital Waveform Trigger Pulse Distributor Ignition Module Trigger IGF Combustion Feedback Loop Square Digital Signal Pulse Ignition Coil Secondary Confirmation SPD Road Velocity Metric Pulsed Vehicle Speed Frequency Instrument Cluster Speedometer Reed Core Circuit Profiles & Diagnostic Values 1. System Power & Keep-Alive Diagnostics These serve as the high-current dump grounds for
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 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
: For precise wire colors and pin locations (which are essential for avoiding short circuits), the Daihatsu Hijet English Electrical Service Manual
Analog and digital tracking terminals monitor real-time engine dynamics. "The manual I found is for the older EF-VE
: Idle switch signal (part of the throttle position sensor). SPD : Vehicle speed sensor input. Power and Ground : E1 / Earth : Main ECU grounding pins. +B / Power Supply : Battery voltage when ignition is ON. BATT : Backup power supply, always active for memory. Actuators and Controls :
The EF-SE engine suffers from unique thermal stress characteristics due to its placement directly underneath the driver's seat in the Daihatsu Hijet chassis. Ignition Feedback Breakdown (IGF Loop)