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7B-78 AUTOMATIC 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.
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 "Automatic Transaxle Diagnostic Flow
Table" performed?
2
DTC check.
Check DTC of ECM referring to "DTC
Check" in section 6.
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.
No
Could be a temporary
malfunction of TCM.
No
Go to "Automatic Transaxle
Diagnostic Flow Table" in
this section.
Substitute a known-good
TCM and recheck.
If OK, substitute a known-
good ECM and recheck.
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