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DTC U0120: GCU CAN timeout
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- 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 (Refer to GROUP 54C - CAN Bus Diagnostics Table
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- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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MONITOR EXECUTION
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
Sensor (The sensor below is determined to be normal)
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
The PHEV-ECU power supply voltage is between 10 and 16 volts for more than 5 seconds.
Judgment Criterion
Unable to receive power drive unit (GCU) signals through the CAN bus line for 0.3 second.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 2 .
PROBABLE CAUSES
- Malfunction of CAN bus line.
- Malfunction of the power drive unit (GCU).
- Malfunction of the PHEV-ECU.
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STEP 1. Using scan tool (M.U.T.-IIISE), diagnose CAN bus line.
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Diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ). Then go to Step 5.
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STEP 2. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
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Check whether the DTC U0120 is set in the power drive unit (GCU) [Refer to GROUP 54C- CAN Communication-related DTC (U-code) Table ].
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Go to Step 3.
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Go to Step 4.
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STEP 3. Test the OBD-II drive cycle.
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(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 2 .
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Replace the power drive unit (GCU) (Refer to GROUP 54Db - Power Drive Unit Removal and Installation ). Then go to Step 5.
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The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
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STEP 4. Test the OBD-II drive cycle.
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(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 2 .
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Replace the PHEV-ECU (Refer to ). Then go to Step 5.
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The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
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STEP 5. Test the OBD-II drive cycle.
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(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 2 .
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Retry the troubleshooting.
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The procedure is complete.
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