Color exerts considerable influence on the world. It conveys messages, signals actions, and shapes moods. And if you’ve ever loved an automobile, then chances are you understand this chromatic power: the body color you chose is, after all, an extension of you

The future is electrified, and Lexus is committed to making it a reality. With the goal of achieving carbon neutrality, Lexus revealed its first global battery EV (BEV), the 2023 Lexus RZ 450e, this year as a part of its ‘Lexus Electrified’ future

Aaahh ...

Missing an E fan.....

Could be that the missing fan completes a circuit.

I have the shop manual for the 1990, official $300 manual, and the diagnostic for the Idle valve is VERY interesting.  On this 1990, you apply positive voltage to the center two terminals of the valve itself (after disconnecting the plug), then apply positive voltage to the remaining plugs (S4, S3, S2, S1) in that 4 to 1 sequence.

Imagine the number of jumpers you need.  Positive voltage to S4, keeping it positive, adding a positive jumper to S3, etc.  At the end of this sequence, the valve will open.

Then, pull the S1 to S4 jumpers.  Then add positive voltage to S1, add to S2, add to S3, add to S4.  Reversing basically.  Then the valve will shut.

4 idle positions.  Once S1 is okay it would open a calibrated amount, then continue to S2, etc for an additional amount, etc, up to S4.

Quite clever indeed.  Some complex little circuitry.

Either the idle air valve is bad, or the missing fan is a culprit.

Just a guess, but imagine the 98 follows the basic logic of the 90.

Hope this helps somewhat.