Jeep Grand Cherokee 2,7 CRD 2003 ЭБУ

[RADEON]

Ну а 5 вольт не садится при этом?

Даже если заметно не садится, померять ток в цепях их питания. Может стаб в защиту уходит и шепчет процу по SPI о фейлах.

Датчик давления хладагента не стоит забывать. Может запитываться по другой цепи, но от того же стаба.

[MartinsX]

I have seen similar faults of those ECU. Once problem was solved by replacing voltage regulator for alternator. It is controlled from ECU, too. When something overloads sensor circuits, internal signal ground may burn inside ECU. For test You can find signal ground wire (common for some of sensors You have faults stored) end connect it to ground externally. If all or almost all faults are cleared with external ground, that is it.
P.S. If You will find what exactly happens inside ECU, let me know, please. I have one or two bad ECU's, too. Would be interesting to find what happened and repair them.