Dtc P1702: Internal Control Module Memory Check Sum Error; Dtc P1703: Can Invalid Data - Tcm - Suzuki Swift Sport 2004 Service & Repair Manual

5A-68 Automatic Transmission/Transaxle:

DTC P1702: Internal Control Module Memory Check Sum Error

DTC Detecting Condition and Trouble Area
DTC detecting condition
Calculation of current data stored in TCM is not correct comparing with
pre-stored checking data in TCM.
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch OFF.
2) Clear DTC in TCM memory.
3) After 10 seconds passed from turning ignition switch ON, check DTC.
DTC Troubleshooting
Step
1 Is DTC P1702 detected after performing "DTC Confirmation
Procedure"?

DTC P1703: Can Invalid Data - TCM

DTC Detecting Condition and Trouble Area
When abnormality either on the gear shift control signal from ECM is detected by TCM, TCM sets DTC P1703.
DTC Troubleshooting
Step
1 Was "A/T System Check" performed?
2 DTC check
1) Check DTC of ECM referring to "DTC Check in Section
1A".
Is there any DTC(s)?
Action
Action
Trouble area
TCM
Yes
Faulty TCM.
Replace TCM.
Yes
Go to Step 2.
Go to applicable DTC
diag. flow.
S7RS0B5104035
No
Could be a temporary
malfunction of TCM.
S7RS0B5104036
No
Go to "A/T System
Check".
Substitute a known-
good TCM and recheck.
If OK, substitute a
known-good ECM and
recheck.