: IGT provides the ignition timing signal to the igniter, while IGF returns the confirmation signal to the ECU.
: A 4-wire O2 sensor includes pins for the heater (+), heater ground (-), signal, and signal ground. toyota 4afe ecu pinout
By systematically identifying your engine generation, validating key supply voltages, and mapping the target functions of each pins acronym, wiring and maintaining the classic Toyota 4A-FE engine becomes a straightforward and manageable task. : IGT provides the ignition timing signal to