Code No. C2101 Abnormality in battery voltage (high 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 (Refer to GROUP 54C, Trouble code diagnosis

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.7) energizes the ABS-ECU.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is set when the ABS-ECU power supply voltage is more than 18.0 ± 1.0 V.

PROBABLE CAUSES

Battery failure
ABS-ECU malfunction
Charging system failed
Battery terminal looseness

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis

Use M.U.T.-III 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 Diagnosis table .) On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines

Q. Is diagnosis code No.C2101 set?

	Go to Step 3.

	This diagnosis is complete.

STEP 3. Battery check

Refer to GROUP 54A - Battery Test

Q. 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 - Charging System

<4A9, 4B1>

<BWC>.

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 diagnosis code is reset.

Q. Is diagnosis code No.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 diagnosis code is reset.

Q. Is diagnosis code No.C2101 set?

	Return to Step 1.

	This diagnosis is complete.