Code No. C211C: Abnormal IG1 power supply low voltage






caution If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, always diagnose the CAN bus lines.

OPERATION


4WD-ECU detects an IG1 power supply voltage abnormal drop, and if any abnormality occurs, it interrupts the system.

DIAGNOSIS CODE SET CONDITIONS


If the following conditions are met when the system is activated, 4WD-ECU gradually switches the control from 4WD to 2WD, flashes the 4WD/LOCK indicators alternately, and sets the diagnosis code No. C211C.


PROBABLE CAUSES


Current trouble
Past trouble

DIAGNOSIS PROCEDURE


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


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 line. (Refer to GROUP 54C - Troubleshooting .) On completion, go to Step 2.

STEP 2. Check whether the diagnosis code is reset after repairing the CAN bus line.


(1)Erase the diagnosis code.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code No. C211C set?

Go to Step 3.
This diagnosis is complete.

STEP 3. Check the following connector:


Check the connectors below for improper engagement, terminal damage or terminal drawn in the connector case.

  • C-130 4WD-ECU connector
  • C-309, C-313, C-317 ETACS-ECU connector

Q. Are the connectors and terminals in good condition?

Go to Step 4.
Repair the connector(s) or terminal(s). Then go to Step 8.

STEP 4. Wiring harness check


Check the wiring harness between the C-130 4WD-ECU connector and the C-313 ETACS-ECU connector for damage or other problem.

Q. Is the wiring harness in good condition?

Go to Step 5.
Repair damage or other problem in the wiring harness. Then go to Step 8.

STEP 5. Voltage measurement at the 4WD-ECU connector


(1)Disconnect the C-130 4WD-ECU connector.
(2)Measure the voltage between the C-130 wiring harness side connector terminals No. 4 and No. 10.
OK: Battery voltage

Q. Is the check result normal?

Go to Step 8.
Go to Step 6.

STEP 6. Wiring harness check


Check the wiring harness between the C-130 4WD-ECU connector (terminal No. 4) and the C-309 ETACS-ECU connector (terminal No. 1) for damage or other problem.

Q. Is the wiring harness in good condition?

Go to Step 7.
Repair the wiring harness. Then go to Step 8.

STEP 7. Check whether the diagnosis code is reset.


(1)Erase the diagnosis code.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code No. C211C set?

Replace 4WD-ECU. (Refer to .) Then go to Step 8.
The trouble can be an intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)

STEP 8. Check whether the diagnosis code is reset.


(1)Erase the diagnosis code.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code No. C211C set?

Diagnose again from Step 1.
This diagnosis is complete.