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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 set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, Trouble code diagnosis ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.

CIRCUIT OPERATION
The ABS-ECU is energized by the valve power supply circuit (terminal No.26).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.26) energizes the ABS-ECU.

DTC SET CONDITIONS
This DTC is set when the ABS-ECU power supply voltage is more than 18.0 ± 1.0 volts.

PROBABLE CAUSES

  • Battery failure
  • ABS-ECU malfunction
  • Charging system failed

DIAGNOSIS
Required Special Tools:
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)

    • MB991824: Vehicle Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A
  • MB991974: ABS check harness

STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.

Q. 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

Q. Is DTC C2101 set?
Go to Step 3.
The procedure is complete.

STEP 3. Battery check
Refer to GROUP 54A - Battery Test .

Q. Is the battery in good condition?
Go to Step 5.
Replace the battery. Then go to Step 4.

STEP 4. Charging system check
Refer to GROUP 16 - Output Current Test .

Q. Is the charging system in good condition?
Go to Step 5.
Repair or replace the charging system component(s).

STEP 5. Check whether the DTC is reset.

Q. Is DTC C2101 set?
Replace the hydraulic unit (ABS-ECU) (Refer to ). Then go to Step 6.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 6. Check whether the DTC is reset.

Q. Is DTC C2101 set?
Return to Step 1.
The procedure is complete.