Suzuki GRAND VITARA JB416 Service Manual page 343

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?
DTC P1777: TCM Lost Communication with ECM (Reception Error)
Wiring Diagram
Refer to "DTC P1774: CAN Communication Bus Off: ".
DTC Detecting Condition and Trouble Area
DTC Detecting Condition
Reception error of communication data for ECM is detected for
longer than specified time continuously.
(1 driving cycle detection logic)
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC by using scan tool.
3) Start engine and run it for 1 min. or more.
4) Check DTC and pending DTC.
Action
Automatic Transmission/Transaxle:
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.
Trouble Area
• ECM
• ABS/ESP® control module
• TCM
• CAN communication line circuit
5A-24
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.
S5JB0E5104042