|Bosch throttle body for the Ferrari 360.|
If you've got a Bosch throttle body (series 280 750 ---) on your car, and it isn't a Ferrari 360, then it's likely if anything goes wrong, or is even suspected of being wrong with your throttle body, you'll just replace it. They're inexpensive, typically under $150, and super easy to install.
However, if you have a Ferrari 360 and suspect an issue with your throttle bodies (plural), then you're probably sweating right now. The stock of new OEM throttle bodies (aka holder) has been exhausted for years. There just aren't any more and there will likely never be any more produced.
Used throttle bodies are generally useless, due to the requirement that both units be matched. Unmatched units, as in one degrading faster than the other, result in trouble codes and limp mode.
Luckily, the same exact innards to the 360's throttle bodies exist on quite a few other cars and these innards can be transplanted into the old 360 throttle body with excellent results.
The Ferrari 360 has some peculiar issues with the throttle body destroying one of the ECU's. These ECU's are no longer available and can be quite expensive to replace. The throttle bodies can destroy the ECU by drawing too much power and melting the H-bridge solder joints in the ECU. In theory, the ECU can be repaired but it's better to catch the problem before that happens and replace the throttle bodies.
A test to determine how much power is being drawn by the throttle body would determine if it is a danger to the ECU and needs replacing. The total power that a Ferrari 360 ECU can supply before burning out is about six amps. A normal throttle body in good condition draws about one amp. So two, normally operating throttle bodies should draw about two amps.
Testing a throttle body for amp draw is pretty easy once the details of how they work are laid out. The "280 750" series use two potentiometers to sense the position of the throttle plate and a motor with a PWM (Pulse Width Modulation) power source to move the throttle plate.
This test is for the motor circuit only. The motor is typically the problem and can be tested using inexpensive parts and a simple setup.
Parts used in this test:Onyehn PWM DC 10-60V Motor Speed Controller