(TC-SST)

DTC U0001: Bus-off

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.

DESCRIPTIONS OF MONITOR METHODS
TC-SST-ECU ceases communication (bus-off).

MONITOR EXECUTION
^ Continuous

MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
^ P0841: Clutch 1 pressure sensor system (Poor performance)
^ P0842: Clutch 1 pressure sensor system (Output low range out)
^ P0843: Clutch 1 pressure sensor system (Output high range out)
^ P0846: Clutch 2 pressure sensor system (Poor performance)
^ P0847: Clutch 2 pressure sensor system (Output low range out)
^ P0848: Clutch 2 pressure sensor system (Output high range out)
^ P185D: Clutch open not possible
^ U0100: Engine time-out error
^ P1803: Shift lever system (CAN or LIN time-out error)
^ P1870: Engine torque signal abnormality
^ P1871: APS system (Signal abnormality)
^ P1872: Between shift lever and TC-SST system (Q-A function abnormality)

Sensor (The sensor below is determined to be normal)
^ Clutch 1 pressure sensor
^ Clutch 2 pressure sensor
^ APS
^ Shift lever-ECU

LOGIC FLOW CHARTS (Monitor Sequence)





DTC SET CONDITIONS

Check Conditions
^ Voltage of battery: 8 V or more.
^ Voltage of battery: 16.5 V or less.
^ Time after TC-SST-ECU start: 5 seconds or more.

JUDGMENT CRITERIA
^ CAN communication: Error. (60 millisecond)

OBD-II DRIVE CYCLE PATTERN
The CAN communication remains normal for 60 milliseconds.

PROBABLE CAUSES
^ The CAN bus line is defective.
^ Malfunction of TC-SST-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, 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. Check whether the DTC is reset.

Q: Is DTC No. U0001 set?
YES: Replace the TC-SST assembly.
NO: Intermittent malfunction.