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DTC C2101: Abnormality in battery voltage (high voltage)
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect DTC may be stored. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Line Diagnostic Flow ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
  • When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to , and ).
 
 
OPERATION
The ASC-ECU is energized by the valve power supply circuit (terminal No.25). When the power is supplied from the ignition switch (IG1) to the IG1 relay in ETACS-ECU, IG1 relay is turned on. At this time, the valve power supply circuit (terminal No.25) energizes the ASC-ECU.
 
 
 
DTC SET CONDITIONS
This DTC is stored when the ASC-ECU power supply voltage is more than 18.0 ± 1.0 V.
 
 
 
PROBABLE CAUSES
  • Battery failure
  • ASC-ECU malfunction
  • Charging system failed
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Use scan tool to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.
 
STEP 2. DTC recheck after resetting CAN bus lines
Is DTC C2101 stored?
Go to Step 3.
The procedure is complete.
 
STEP 3. Battery check
Refer to GROUP 54A - Battery Test .
Is the battery in good condition?
Go to Step 5.
Charge or replace the battery. Then go to Step 4.
 
STEP 4. Charging system check
Refer to GROUP 16 - On-vehicle Service/Output Current Test .
Is the check result normal?
Go to Step 5.
Repair or replace the charging system component(s).
 
STEP 5. Check whether the DTC is stored again.
Erase the DTC.
Is DTC C2101 stored?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then go to Step 6.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
 
STEP 6. Check whether the DTC is stored again.
Erase the DTC.
Is DTC C2101 stored?
Return to Step 1.
The procedure is complete.