Before working on the ECU harness, disconnect the battery to avoid frying delicate components.
Wire a standard 4-pin automotive relay. Connect the trigger coil to the ECU's ignition output and the switched output to pins +B and +B1 .
Brake light switch (used for cruise control/automatic transmission). THO (T/C): Diagnostic check connector pin. Tach (TACHO): Tachometer signal output. W: Check Engine Light signal. Working with 1KZ-TE Wiring (Tips) 1kz ecu pinout
To ensure a smooth wiring process, always use high-quality automotive-grade wire, avoid wire nuts or T-taps, and heat-shrink all your soldered joints to protect against heat and vibration.
Water Temperature Sensor (ECT) signal. Adjusts cold start fueling and glow plug duration. THA: Intake Air Temperature (IAT) sensor signal. Auxiliary & Chassis Inputs Before working on the ECU harness, disconnect the
The Ultimate 1KZ-TE ECU Pinout Guide: Wiring, Diagrams, and Troubleshooting
⚠️ Pinouts vary by and transmission (A/T vs M/T) . Always verify with your exact ECU part number (e.g., 89661-3A230). W: Check Engine Light signal
Triggers the external glow plug relay to pre-heat the cylinders.
(Note: These 34-pin configurations are often further categorized into three 34-pin connectors based on the specific generation of the 1KZ-TE.) B. Connector 2 (22 Pins) Injector 1 (Spill Control Valve +) E11-2: Injector 1 (Spill Control Valve -) E11-3: Injector 2 (Spill Control Valve +) E11-4: Injector 2 (Spill Control Valve -)
2. Typical 1KZ-TE ECU Connector Layout (34+22+16 Pin System)
