Code No. C2101 Power supply 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 - CAN Bus Diagnostics Table ).
Whenever ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION

The ASC-ECU is energized by the valve power supply circuit (+BV terminal). 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 (IG1 terminal) energizes the ASC-ECU.

DIAGNOSIS CODE SET CONDITIONS

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

PROBABLE CAUSES

Battery failure
ASC-ECU malfunction
Charging system failed

DIAGNOSTIC 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 Diagnostics Table ). On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines

Q. Is the 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 - On-vehicle Service/Alternator Output Line Voltage Drop Test

Q. Is the check result normal?

	Go to Step 5

	Repair or replace the charging system component(s).

STEP 5. Check whether the diagnosis code is reset.

Erase the diagnosis code.

Q. Is the diagnosis code No. C2101 set?

	Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then go to Step 6.

	The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).

STEP 6. Check whether the diagnosis code is reset.

Erase the diagnosis code.

Q. Is the diagnosis code No. C2101 set?

	Return to Step 1.

	This diagnosis is complete.