Shift Lever, (TC-SST)

DTC U0121: ASC Time-out Error

CAUTION:
^ If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code 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.

JUDGMENT CRITERIA
The periodic communication data from the ASC-ECU cannot be received.

PROBABLE CAUSES
^ The CAN bus line is defective.
^ Malfunction of ASC-ECU
^ Malfunction of the shift lever-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using the scan tool, diagnose the CAN bus lines.

Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the CAN bus lines. After repairing the CAN bus line, go to Step 2.

STEP 2. Scan tool diagnostic trouble code
Check the ASC diagnostic trouble code.

Q:Is the DTC set?
YES: Perform the relevant troubleshooting.
NO: Go to Step 3.

STEP 3. Check whether the DTC is reset.

Q: Is DTC No. U0121 set?
YES: Replace the shift lever assembly.
NO: Intermittent malfunction.