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DTC C2101 Power Supply High Voltage
 
 
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 (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
 
 
OPERATION
The ASC-ECU is energized by the valve power supply circuit (+BV terminal). 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 (IG1 terminal) energizes the ASC-ECU.
 
 
 
DTC SET CONDITIONS
This DTC is set when the ASC-ECU power supply voltage is more than 18.0 ± 1.0 volts.
 
 
 
PROBABLE CAUSES
  • Battery failure
  • ASC-ECU malfunction
  • Charging system failed
 
 
 
 
DIAGNOSIS
STEP 1. Charging system check.
Refer to GROUP 16 - On-vehicle Service/Generator Output Line Voltage Drop Test .
Is the check result normal?
Go to Step 2.
Repair or replace the charging system component(s). (Refer to GROUP 16 - Generator ).
 
STEP 2. Check whether the DTC is set again.
Erase the DTC.
Is DTC C2101 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).