Wiring Diagram Daihatsu L9 Ecu Pinout 〈ULTIMATE〉

Low-current signals sent to the igniter/ignition coils to command a spark event.

Sensors for water temperature and vehicle speed, necessary for the ECU to adjust fuel maps.

The table below outlines the typical pin functions for a Daihatsu L9 EFI (Electronic Fuel Injection) system:

Usually organized into A, B, and C or larger 4-connector layouts. wiring diagram daihatsu l9 ecu pinout

Connected to the Black-White wire from the ECU. Radiator Fan Relay: Connected to the Black wire. Check Engine Light: Connected to the Yellow-Blue wire. Constant 12V: Black-Orange wire. Switched 12V: Black-Yellow wire (multiple pins). Troubleshooting ECU Problems

Daihatsu ECUs from the L9 generation generally utilize a multi-plug configuration, frequently featuring a 3-plug or 4-plug horizontal layout. Plug Identification Method

| Pin | Wire Color | Signal | Function | |-----|------------|--------|-----------| | A1 | B/Y | +B | Main relay power (12V) | | A2 | B/R | +B1 | Injector/coil power | | A3 | B | E01 | Power ground | | A4 | B | E02 | Power ground | | A5 | W/B | STA | Starter signal | | A6 | Y/B | NSW | Neutral start switch (AT) | | A7 | G/W | VTA | TPS signal | | A8 | G/R | VC | TPS 5V reference | | A9 | L/R | PIM | MAP sensor signal | | A10 | Y/R | THW | Engine coolant temp | | A11 | B/W | THA | Intake air temp | | A12 | R/L | VAF | Airflow meter (if equipped) | | A13 | B | E2 | Sensor ground | | A14 | R | IGT1 | Ignition trigger #1 | | A15 | G | IGT2 | Ignition trigger #2 | | A16 | W | IGF | Ignition confirmation | | A17 | V/W | OX | Oxygen sensor | | A18 | R/W | VSV | EGR VSV (if equipped) | | A19 | L | ACT | Idle speed control (ISC) | | A20 | B/R | FAN | Radiator fan relay | | A21 | G/Y | A/C | A/C request input | | A22 | Y | PS | Power steering input | | A23 | Lg | SPD | Vehicle speed sensor | | A24 | R/Y | MREL | EFI main relay control | | A25 | B/R | +BM | Backup power (constant 12V) | | A26 | B | E1 | ECU logic ground | Low-current signals sent to the igniter/ignition coils to

To get your dashboard working, map the following output pins: Engine RPM signal sent to the tachometer.

, particularly those performing the popular swap into a Kancil or

Ideal for signal wires, sensor inputs, 20-22 AWG – Used primarily for ECU connections, low-current signals, and CANbus lines. iWire Subaru Wiring Solutions ECU Wiring Schematic Overview | PDF - Scribd Connected to the Black-White wire from the ECU

When measuring pin voltages, use a digital multimeter with an internal resistance rating of at least 10 kΩ/V . Low-resistance analogue test lamps can pull too much current through an ECU sensor line and blow internal circuit traces.

| Test Point | Measurement Condition | Normal Value | | :--- | :--- | :--- | | | Ignition ON | 11.0 – 14.0 V (depending on battery voltage) | | ECU Ground (Pin A3) | Ignition OFF, resistance to battery negative terminal | Less than 1.0 Ω | | Battery Backup (Pin A1) | Engine OFF | 12.0 – 12.6 V | | Throttle Position Sensor (TPS) | Ignition ON, throttle closed → wide‑open throttle | 0.3 – 0.8 V (idle) → 3.5 – 4.5 V (WOT) | | Engine Coolant Temperature | Cold engine (20°C) → warm engine (80°C) | Approx. 2.5 – 3.5 kΩ → 0.2 – 0.4 kΩ | | Oxygen Sensor (signal) | Engine at operating temperature, 2500 RPM | Signal fluctuates between 0.1 V and 0.9 V (5+ cycles in 10 seconds) | | Injector Resistance (each) | ECU disconnected, measure across injector terminals | 12 – 16 Ω (saturated switch type) | | Vehicle Speed Sensor (VSS) | Vehicle moving slowly (resistance check) | Coil resistance: 150 – 250 Ω |

Voltage toggling signal from the exhaust O2 sensor for closed-loop fueling. Actuator Outputs (Engine Control)

Daihatsu ECU Wiring and Diagram Guide | PDF | Electrical Connector