S-AWC (Super All Wheel Control)

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


































OPERATION

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

DIAGNOSTIC TROUBLE CODE SET CONDITIONS

This diagnostic trouble 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

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III diagnostic trouble code.

Check the ETACS diagnostic trouble code. Electronic Time and Alarm Control System (ETACS)).

Q. Is the diagnostic trouble code set?

YES Perform the relevant troubleshooting.
NO Go to Step 2.
STEP 2. Battery terminal check

Check that the battery terminal is not loose.

Q. Is the check result normal?

YES Go to Step 3.
NO Securely install the battery terminal. Then go to Step 3.
STEP 3. Check the charging system.

Generator Output Line Voltage Drop Test.

Q. Is the check result normal?

YES Go to Step 4.
NO Repair or replace the charging system component(s).
STEP 4. Check the battery.

Battery Test.

Q. Is the check result normal?

YES Go to Step 5.
NO Replace the battery. Then go to Step 5.
STEP 5. Voltage measurement at C-139 AWC-ECU connector

Disconnect the connector, and measure the voltage between terminal No.12 and ground at the wiring harness side.

OK: Battery positive voltage


Q. Is the check result normal?

YES Go to Step 9.
NO Go to Step 6.
STEP 6. AWC-ECU connector, ETACS-ECU connector, intermediate connector check: C-139, C-315, C-31, C-138

Q. Is the check result normal?

YES Go to Step 7.
NO Repair the defective connector. Then go to Step 10.
STEP 7. Check the wiring harness between C-139 AWC-ECU connector 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?

YES Go to Step 8.
NO Check C-31, C-138 intermediate connector. When no problem is found, repair the wiring harness. Then go to Step 10.
STEP 8. M.U.T.-III data list.

Item No.31: Battery voltage (CAN input) (Refer to data list reference table Data List Reference Table).

Q. Is the check result normal?

YES Intermittent malfunction. How to Cope With Intermittent Malfunctions).
NO Replace the ETACS-ECU. Electronic Time and Alarm Control System (ETACS)-ECU Removal and Installation).
Then go to Step 10.
STEP 9. M.U.T.-III data list.

Item No.31: Battery voltage (CAN input) (Refer to data list reference table Data List Reference Table).

Q. Is the check result normal?

YES Intermittent malfunction. How to Cope With Intermittent Malfunctions).
NO Replace the AWC-ECU. (Refer to AWC-ECU Removal and Installation). Then go to Step 10.
STEP 10. Check whether the diagnostic trouble code is reset.

Q. Is diagnostic trouble code No.C2101 set?

YES Return to Step 1.
NO This diagnosis is complete.