DTC U1425: Transmission Data Malfunction
caution
If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines.
Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
OPERATION
AWC-ECU communicates with TCM via the CAN bus lines.
DTC SET CONDITIONS
The DTC is set when abnormality is detected in the gear shift signal received from the TCM.
PROBABLE CAUSES
Malfunction of the CAN bus line
Malfunction of TCM
Malfunction of AWC-ECU
DIAGNOSIS
STEP 1. Scan tool (M.U.T.-IIISE) CAN bus diagnostics.
Use scan tool (M.U.T.-IIISE) to perform the CAN bus diagnosis.
Is the check result normal?
Go to Step 2
.
Repair the CAN bus lines (Refer to GROUP 54C - Diagnosis, Can Bus Diagnostics Table
).
STEP 2. Scan tool (M.U.T.-IIISE) other system DTC.
Check the transaxle DTC.
Is the DTC set?
Perform the relevant troubleshooting.
Go to Step 3
.
STEP 3. Scan tool (M.U.T.-IIISE) data list.
Check the following data list (Refer to
).
Item No.28: Gear position (AT/CVT)
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction
).
Go to Step 4
.
STEP 4. Check whether the DTC is set again.
Is the DTC U1425 set?
Replace the AWC-ECU (Refer to
).
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction
).