Ensure 12V is present when the key is in the "On" position.
If this sensor fails, the ECU may think the engine is permanently cold (-40°C), causing it to run extremely rich. toyota 4afe ecu pinout
Transmission controls and auxiliary signals. Plug C (22-pin): Dashboard interface and diagnostic pins. Essential Pin Descriptions and Functions Ensure 12V is present when the key is in the "On" position
A confirmation signal sent back to the ECU to prove a spark occurred. Without this, the ECU will cut fuel. NE: Engine Speed signal (Crankshaft position). toyota 4afe ecu pinout
Once I have those details, I can provide a specific pin-by-pin chart for your exact harness.