1kz Ecu Pinout
If you provide your ECU part number (e.g., 89661-3A230, 89661-3A260, 89661-3A390) and vehicle model/year, I can give you the exact pinout for your variant.
| Pin | Wire Color | Signal Name | Function | Voltage / Signal | | :--- | :--- | :--- | :--- | :--- | | A1 | White/Red | +B1 | ECU Main Relay Power (Constant 12V from relay) | 12V (Key ON) | | A2 | Black/Orange | E01 | Power Ground (Injector driver return) | 0V | | A3 | Yellow/Black | #10 | Injector Driver – Cylinder 1 | Pulse (Battery voltage spike) | | A4 | Yellow | #20 | Injector Driver – Cylinder 2 | Pulse | | A5 | Light Green | #30 | Injector Driver – Cylinder 3 | Pulse | | A6 | White/Black | E02 | Power Ground (Sensor return) | 0V | | A7 | N/A | N/C | Not Connected | - | | A8 | Blue/Red | SCV+ | Spill Control Valve (+) (Fuel quantity) | PWM (0-12V pulses) | | A9 | Blue/Yellow | SCV- | Spill Control Valve (-) (Fuel quantity) | PWM (0-12V pulses) | | A10 | Yellow/Red | MREL | Main Relay Control (ECU switches relay ground) | 12V (Key ON) | | A11 | Red/White | +B | Constant ECU Backup Power (Memory) | 12V (Constant) | | A12 | White/Blue | IGSW | Ignition Switch Signal | 12V (Key ON) | | A13 | Blue/White | Stop L | Brake Pedal Signal (for idle-up logic) | 0V (Brake off) / 12V (Brake on) | | A14 | Black/White | E03 | Sensor Ground (ECU internal) | 0V | | A15 | Brown | #40 | Injector Driver – Cylinder 4 | Pulse | | A16 | Red | VCV+ | Timing Control Valve (+) | PWM | | A17 | Light Green/Black | VCV- | Timing Control Valve (-) | PWM | | A18 | Blue/Black | EDU | EDIC (Fuel cut solenoid – early models) | 12V (Run) / 0V (Stop) | | A19 | Black/Red | E04 | Shield Ground (for sensor cables) | 0V | | A20 | N/A | N/C | Not Connected | - | | A21 | N/A | N/C | Not Connected | - | | A22 | Black/Yellow | EO1 | Power Ground (High current) | 0V | 1kz ecu pinout
| Pin | Wire Color | Signal | Description | |-----|------------|--------|--------------| | A1 | B-R | +B1 | Main relay power input | | A2 | B-Y | +B | Main relay power input | | A3 | B-W | E1 | ECU ground (power) | | A4 | W-B | E2 | ECU ground (sensor return) | | A5 | R-L | #10 | Injector 1 | | A6 | R | #20 | Injector 2 | | A7 | R-W | #30 | Injector 3 | | A8 | R-B | #40 | Injector 4 | | A9 | G-B | VTA | TPS (throttle position sensor) | | A10 | L-R | IDL | TPS idle contact | | A11 | B-O | VCC1 | TPS +5V reference | | A12 | B | E2G | TPS ground | | A13 | W | THW | Engine coolant temp sensor | | A14 | R-B | THA | Intake air temp sensor | | A15 | G-R | VAF | Air flow meter signal | | A16 | B-Y | KS | Knock sensor | | A17 | L-Y | NE+ | Crank position sensor (+) | | A18 | B | NE- | Crank position sensor (-) | | A19 | G-O | G+ | Cam position sensor (G1) | | A20 | B-W | G- | Cam position sensor ground | | A21 | B-R | STA | Starter signal (from ignition switch) | | A22 | R-Y | NSW | Neutral start switch (A/T) / Clutch (M/T) | | A23 | G-W | A/C | A/C request signal | | A24 | L | PS | Power steering oil pressure switch | If you provide your ECU part number (e
| Pin Number | Circuit Description | Notes | | :--- | :--- | :--- | | 1 | Injector #1 | Output to No. 1 Cylinder Injector | | 2 | Injector #2 | Output to No. 2 Cylinder Injector | | 3 | Injector #3 | Output to No. 3 Cylinder Injector | | 4 | Injector #4 | Output to No. 4 Cylinder Injector | | 14 | Earth (Ground) | Critical – ECU Ground (to body/engine) | | 15 | Earth (Ground) | Critical – ECU Ground (to body/engine) | | 16 | +B (Battery Power) | Constant 12V from Battery (usually via EFI fuse) | | 17 | EFI Main Relay | Switches power to the relay coil | | 22 | SPD (Speed Signal) | Input from Vehicle Speed Sensor | | 24 | THW (Water Temp) | Engine Coolant Temperature Signal | | 26 | THA (Intake Temp) | Intake Air Temperature Signal | | Pin | Wire Color | Signal Name