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

OPERATION

AWC-ECU power supply is provided from the battery via ETACS-ECU.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is set when the AWC-ECU power supply voltage and the actuator power supply voltage are 18 V or more.

PROBABLE CAUSES

Malfunction of charging system
Loose battery terminal
Damaged harness wires and connectors
Malfunction of AWC-ECU
ETACS-ECU malfunction

DIAGNOSIS PROCEDURE

STEP 1. 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 2.

STEP 2. Battery terminal check

Check that the battery terminal is not loose.

Q. Is the check result normal?

	Go to Step 3.

	Securely install the battery terminal. Then go to Step 3.

STEP 3. Check the charging system.

Refer to GROUP 16 - Charging System.

Q. Is the check result normal?

	Go to Step 4.

	Repair or replace the charging system component(s).

STEP 4. Check the battery.

Refer to GROUP 54A - Battery Test.

Q. Is the check result normal?

	Go to Step 5.

	Replace the battery. Then go to Step 5.

STEP 5. Voltage measurement at AWC-ECU connector

Disconnect the connector, and measure the voltage between AWC-ECU connector terminal BATT and earth at the wiring harness side.

OK: System voltage

Q. Is the check result normal?

	Go to Step 8.

	Go to Step 6.

STEP 6. Check of short circuit in BATT line between AWC-ECU connector and ETACS-ECU connector.

Q. Is the check result normal?

	Go to Step 7.

	Repair the connector(s) or wiring harness. Then go to Step 9.

STEP 7. M.U.T.-III data list.

Item No.31: Battery voltage (CAN input) (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 9.

STEP 8. M.U.T.-III data list.

Item No.31: Battery voltage (CAN input) (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 9.

STEP 9. Check whether the diagnosis code is set again.

Q. Is diagnosis code No.C2101 set?

	Return to Step 1.

	This diagnosis is complete.