Suzuki Swift Sport 2004 Service & Repair Manual page 716

5A-72 Automatic Transmission/Transaxle:
DTC Troubleshooting
NOTE
Upon completion of inspection and repair work, perform "DTC Confirmation Procedure:" and confirm
that the trouble has been corrected.
Step
1 Was "A/T System Check" performed?
2 Control module connector check
1) Check connection of connectors of all control modules
communicating by means of CAN.
2) Recheck DTC.
Is there DTC P1774?
3 CAN communication circuit check
1) Turn ignition switch to OFF position.
2) Disconnect connectors of all control modules
communicating by means of CAN.
3) Check CAN communication circuit between control
modules for open, short and high resistance.
Is each CAN communication circuit in good condition?
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 from any one of control modules
other than BCM and TCM.
4) Recheck TCM for DTC.
Is DTC P1774 detected?
5 DTC check of BCM
1) Turn ignition switch to OFF position.
2) Disconnect connector from all control modules other
than BCM.
3) Check BCM for DTC referring to "DTC Check in Section
10B"
Is DTC U1073 (No. 1073) detected?
Action Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
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, go to Step 5.
Substitute a known
good BCM and recheck.
No
Go to "A/T System
Check".
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section
00"
Repair circuit.
Check power and
ground circuit of control
module disconnect in
Step 3). If circuit is OK,
substitute a known-
good control module
disconnected in Step 3)
and recheck.
Substitute a known
good TCM and recheck.