The 3ZZ-FE is a common swap for older Toyotas (like the AE101 or AE111 Corollas). In a swap scenario, you are often trying to marry an older body harness with a newer engine harness.
If your PDF is missing the for the Coolant Temp Sensor (THW) between pins THW and E2, discard it. You need the 2000-3000 ohm specification at room temperature. 3zz-fe Ecu Pinout Pdf
There is a lot of junk wiring diagrams online. Many "free" PDFs are blurry scans or for the wrong engine (1ZZ-FE or 4ZZ-FE). While the 1ZZ is similar, the pinouts differ regarding the VVT-i solenoid and O2 sensor heater circuits. The 3ZZ-FE is a common swap for older
Modern vehicles often throw "Check Engine" lights. While an OBD-II scanner can tell you which code is stored (e.g., P0135 - Oxygen Sensor Heater Circuit Malfunction), it doesn't tell you where the break in the wire is. With a 3ZZ-FE ECU pinout PDF, you can perform back-probing at the ECU harness. You can verify if the signal is reaching the ECU from the sensor. If the signal is present at the sensor but not at the ECU pin, you know you have a wiring harness fault, not a sensor failure. You need the 2000-3000 ohm specification at room temperature