2-pin Pink/Black and Pink/green = coolant temp sensor
Engine coolant temperature (ECT) sensor
The engine coolant temperature (ECT) sensor is located on the coolant outlet
elbow. It is a temperature dependent resistor (thermistor), the voltage output of
which varies in inverse proportion to temperature, in that the output increases as
temperature decreases or the reverse. The change in resistance is monitored by
the ECM on a KG wire and as a result the ECM can adjust the length of injector
opening time required. The ECM supplies the coolant temperature sensor with
an earth path on a KB wire.
- 2-pin Brown/yellow Brown/white (thicker) = not sure, injector plug wire should be pink brown and yellow brown according to electric manual, may be your brown/white wire is actually brown/pink?
MEMS ECM
The ignition sense of the ECM receives battery voltage from fuse A4 in the
passenger compartment fuse box on a W wire provided the starter switch is in
position II. As a result the ECM supplies an earth from the main relay control on
a WK wire to one side of the main relay coil (within the MEMS relay module).
Since the other side of the main relay receives battery voltage on an N wire from
link 4 in the engine compartment fuse box, the relay will energise switching
battery voltage via the relay contacts on an NK wire to the injector(s), purge
valve, stepper motor, ignition coil, manifold heater (Japan only) and positive feed
to the ECM.