Compression pressure
Inspection
Warm up engine and then turn it off.
Release fuel pressure.
Remove ignition coil and spark plug from each cylinder.
Connect engine tachometer (not required in use of CONSULT).
Install compression gauge (B) with an adapter (A) (commercial
service tool) onto spark plug hole.
...
U1000 CAN COMM
DTC Logic
DTC DETECTION LOGIC
NOTE: U1000 can be set if a module harness was disconnected and
reconnected, perhaps during a repair. Confirm that there are actual CAN
diagnostic symptoms and a present DTC by performing the Self Diagnostic Result
procedure.   ...