Suzuki Grand Vitara 2011 Manual page 1296

5A-71 Automatic Transmission/Transaxle:
Step
4 DTC check
1) Turn ignition switch to OFF position.
2) Connect connectors of disconnected control modules
communicating by means of CAN.
3) Disconnect connector of any one of control module other
than TCM.
4) Recheck DTC for TCM.
Is DTC P1774 detected?
Action Yes
Disconnect connectors
of control modules other
than the one whose
connector is
disconnected in Step 3)
one by one and check
that DTC P1774 is
detected by TCM each
time connector is
disconnected. When
DTC P1774 is not
detected by TCM while
checking in this way, go
to description under
"NO" below. If DTC
P1774 is detected by
TCM even when
connectors of all control
modules that use CAN
communication with
TCM are disconnected,
substitute a known-
good TCM and recheck.
No
Check power and
ground circuit of control
module disconnected in
Step3). If circuit is OK,
substitute a known-
good control module
disconnected in Step 3)
and recheck.