Crankshaft Position Sensor. The engine will not start without this sync signal. G2+: Camshaft Position Sensor signal.
Need to start the engine with a bare harness? Here are the mandatory pins: 2uzfe ecu pinout
You can find high-resolution diagrams and detailed terminal voltage specifications at the following locations: 100 Series Land Cruiser : Specialist shops like ChipTorque Crankshaft Position Sensor
Note: These are low-impedance peak-and-hold drivers. Do not use high-impedance injectors without a resistor pack. 2uzfe ecu pinout