Given:
BCM logged a signal missing from ECM
TCM logged a signal missing from ECM
ECM is not getting temperature readings sometimes
I'd be inspecting and cleaning the ECM connectors, and inspecting and cleaning the temperature sensor connectors, and the injector connectors, and inspecting the ECM ground connections.
Check also the engine loom for any fraying or abrasion.
Look for any traces of corrosion anywhere on the ECM and the relevant connectors
Suspect anything that is dirty, oily and/or corroded or broken.
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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