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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 V.
 
 
 
TROUBLESHOOTING HINTS
  • Battery failure
  • ASC-ECU malfunction
  • Charging system failed
 
 
 
 
DIAGNOSIS
STEP 1. Scan tool (M.U.T.-III) CAN bus diagnostics
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
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 No. C2101 set?
Go to Step 3.
This diagnosis 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/Generator Output Line Voltage Drop 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 set again.
Erase the DTC.
Is DTC No. C2101 set?
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 set again.
Erase the DTC.
Is DTC No. C2101 set?
Return to Step 1.
This diagnosis is complete.