Code No.C2100: Battery Voltage Malfunction (Low Voltage)














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



OPERATION



DIAGNOSIS CODE SET CONDITIONS




  • When the AWC-ECU power supply voltage and solenoid valve power supply voltage are 9 V or less.

PROBABLE CAUSES



  • Malfunction of the ETACS-ECU
  • Defective battery
  • Charging system failed
  • 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.C2100 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. Check the battery.
Refer to GROUP 54A - Battery Test .

Q. Is the check result normal?
Go to Step 6.
Charge or replace the battery. 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. 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 10.
Go to Step 7.

STEP 7. AWC-ECU connector, ETACS-ECU connector check: C-44, C-315

Q. Is the check result normal?
Go to Step 8.
Repair the defective connector. Then go to Step 13.

STEP 8. Check the wiring harness between C-44 AWC-ECU connector terminal No.12 and C-315 ETACS-ECU connector terminal No.4.
Check the power supply line for short or open circuit.

Q. Is the check result normal?
Go to Step 9.
Check C-27 intermediate connector and C-39 J/C (1) <RHD>. When no problem is found, repair the wiring harness. Then go to Step 13.

STEP 9. 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 13.

STEP 10. AWC-ECU connector check: C-44

Q. Is the check result normal?
Go to Step 11.
Repair the defective connector. Then go to Step 13.

STEP 11. Check the wiring harness between C-44 AWC-ECU connector terminal No.13 and body earth.
Check the earth line for open circuit.

Q. Is the check result normal?
Go to Step 12.
Repair the wiring harness. Then go to Step 13.

STEP 12. 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 13.

STEP 13. Check whether the diagnosis code is reset.

Q. Is diagnosis code No.C2100 set?
Return to Step 1.
This diagnosis is complete.