No start / no fuel pump
No spark
OBD2 access (Euro L9 only)
| Symptom | Likely Cause | Pin to Check | | :--- | :--- | :--- | | Cranks, no start | No power to EFI relay | A4 (should read 12V with key ON) | | Rich idle, black smoke | Oxygen sensor heater ground fault | B10 signal stuck at 0V or 1V constant | | Intermittent stalling | Loose crankshaft position sensor plug | B2 (wiggle test while monitoring signal) | | Cooling fans run constantly | Shorted fan relay control wire | C6 or C7 shorted to ground | | No boost (turbo models) | Wastegate solenoid wiring broken | C9 (check for 10-15 ohms across solenoid) |
This includes diagnostic lines (K-Line, CAN bus on later models), A/C clutch relay, radiator fan control, and on the Copen L880, the electric power steering (EPS) interface. wiring diagram daihatsu l9 ecu pinout
The ECU switches the ground path for injectors (pins A5, A6, A7) and ignition transistors (pins A8, A9, A10). When testing with a noid light, you should see flashing.
Critical safety: Never apply 12V directly to an ECU output pin. You will destroy the driver transistor. No start / no fuel pump
| Pin | Function | Color (typical) | Notes | |------|---------------------|----------------|-----------------------------| | 1 | Injector #1 | Yellow/Black | Ground switched by ECU | | 2 | Injector #2 | Yellow/Red | | | 3 | Injector #3 | Yellow/Blue | | | 4 | Power ground | Black/White | To engine block | | 5 | Sensor ground | Brown | 0V for TPS, MAP, etc. | | 6 | +12V battery (main) | White/Red | Via EFI main relay | | 7 | +12V ignition (key-on) | Black/Yellow | From ignition switch | | 8 | Check engine light | Green/Yellow | To instrument cluster | | 9 | Fuel pump relay | Blue/Red | ECU grounds to turn on | | 10 | Main relay control | Gray | | | 11 | Ignition coil #1 (all 3 cyl share) | White/Blue | Power transistor trigger | | 12 | Ignition coil #2 (dummy, not used) | – | Only 1 coil on EF-JL | | 13 | TPS signal | Yellow/Green | 0.5–4.5V | | 14 | MAP sensor signal | Light Green | 1.0–4.5V | | 15 | Intake air temp | Red/Black | 2–3V at 20°C | | 16 | Coolant temp | Red/White | 2.5V cold, 0.5V hot | | 17 | O2 sensor signal | Black/White | 0.1–0.9V (narrowband) | | 18 | O2 sensor heater ground | Black | | | 19 | Neutral switch (auto) / clutch (manual) | Green/Red | Start inhibit | | 20 | VSS (speed sensor) | Pink | 4 pulses per driveshaft rev |
⚠️ This is a representative sample – do not use without verifying against your ECU number. No spark