Slow Down Lights

Maybe this has been addressed, but my "slow down light" keeps coming on with no CAT overheat. I've done everything as far as replacing CAT temp ECUs and the problem persists. The light comes on cold engine either solid or blinking. when it comes on solid after a few minutes it shuts down the left bank. I performed duplicate tests of the voltage being emitted by the three ECUs to the Motronic 5.2 and it is text-book at 0.51 volts with the engine cold. The SD2 confirms all CAT temperatures are within range. All three ECUs are reading perfectly and 0.50-0.51 Volts. I drove it to Ferrari of Seattle about 25 miles with the problem running on 1 bank of cylindars and they confirmed the Motronic shut down the left bank because all those readings were cold. Ferrari of Seattle says there are some other boxes on this circuit behind the dash they are going to study as a potential source of of significant voltage to shut down the engine through the ECU circuit and turn on the Slow Down lights. Has anybody had this poblem?

 

The Motronic has to be getting something in the range of a 5V signal to shut down one bank of cylinders, but in the back of the car going to the Motronic, I can only read 0.5V right on spec going to the Motronic out of the three T/C ECUs.

I've also checked the ground between the motronic and the cable to the Clutch pumpkin and there is zero volts.

No unusal drain on current.

No electrolisis - sparks etc. With Slow Down flashing at the dealer, we swapped the Motronic - I have mod standard 004 (the latest) we put in a Mod 002 and the Slow Down continued to flash the way it was with the different Motronic. We thus ruled out the Motronic.

 

See my other post today - Ferrari of Seattle (best mechanic in the area) found a bent pin and broken wire in a connector down stream from the CAT ECUs to the Main ECU.