Code No.C2101: Battery Voltage Malfunction (High Voltage)


POWER SUPPLY SYSTEM CIRCUIT



caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION



DIAGNOSIS CODE SET CONDITIONS



PROBABLE CAUSES



  • Loose battery terminal
  • Defective battery
  • Charging system failed
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors
  • Malfunction of AWC-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting ). After repairing the CAN bus line, go to Step 2.

STEP 2. Check whether the diagnosis code is reset.

Q. Is diagnosis code No.C2101 set?
Go to Step 3.
This diagnosis is complete.

STEP 3. M.U.T.-III diagnosis code.
Check the ETACS diagnosis code. (Refer to GROUP 54A - Troubleshooting ).

Q. Is the diagnosis code set?
Perform the relevant troubleshooting.
Go to Step 4.

STEP 4. Battery terminal check
Check that the battery terminal is not loose.

Q. Is the check result normal?
Go to Step 5.
Securely install the battery terminal. Then go to Step 5.

STEP 5. Check the charging system.
Refer to GROUP 16 - Charging System .

Q. Is the check result normal?
Go to Step 6.
Repair or replace the charging system component(s).

STEP 6. Check the battery.
Refer to GROUP 54A - Battery Test .

Q. Is the check result normal?
Go to Step 7.
Replace the battery. Then go to Step 7.

STEP 7. Voltage measurement at C-44 AWC-ECU connector
Disconnect the connector, and measure the voltage between terminal No.12 and earth at the wiring harness side.
OK: System voltage

Q. Is the check result normal?
Go to Step 11.
Go to Step 8.

STEP 8. AWC-ECU connector, ETACS-ECU connector check: C-44, C-315

Q. Is the check result normal?
Go to Step 9.
Repair the defective connector. Then go to Step 12.

STEP 9. Check the wiring harness between C-44 AWC-ECUconnector terminal No.12 and C-315 ETACS-ECU connector terminal No.4.
Check the power supply line for short circuit.

Q. Is the check result normal?
Go to Step 10.
Check C-27 intermediate connector, C-39 J/C (1) <RHD>. When no problem is found, repair the wiring harness. Then go to Step 12.

STEP 10. M.U.T.-III data list.
Item No.43: Battery voltage (Refer to data list reference table ).

Q. Is the check result normal?
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU. (Refer to GROUP 54A - ETACS-ECU ). Then go to Step 12.

STEP 11. M.U.T.-III data list.
Item No.43: Battery voltage (Refer to data list reference table ).

Q. Is the check result normal?
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the AWC-ECU. (Refer to ). Then go to Step 12.

STEP 12. Check whether the diagnosis code is reset.

Q. Is diagnosis code No.C2101 set?
Return to Step 1.
This diagnosis is complete.