Code No.B210A +B power supply (low)
Code No.B210B +B power supply (high)


caution
  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)

TROUBLE JUDGMENT


The ETACS-ECU sets the code No. B210A if the power supply fuse (IOD fuse) voltage decreases to the specified value or less, and sets the code No. B210B if the power supply fuse (IOD fuse) voltage increases to the specified value or more. However, when the status returns to normal, the ETACS-ECU automatically erases the code Nos. B210A and B210B.

COMMENTS ON TROUBLE SYMPTOM


The power supply fuse or the ETACS-ECU may have a problem.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. Power supply fuse check


Q. Is the fuse in good condition?

Go to Step 2.

Replace the power supply fuse, and then go to Step 7.

STEP 2. Battery check


Refer to GROUP 54A - Battery Test .

Q. Is the battery in good condition?

Go to Step 3.

Charge or replace the battery.

STEP 3. Charging system check


Refer to GROUP 16 - Charging System .

Q. Is the charging system in good condition?

Go to Step 4.

Repair or replace the charging system component(s).

STEP 4. Voltage measurement at ETACS-ECU connector (IODI terminal).


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the ETACS-ECU connector (IOD1 terminal) and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 6.

Go to Step 5.

STEP 5. Check of short to power supply, short to earth, and open circuit in IODI line between fusible link and ETACS-ECU connector


Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

Repair the connector(s) or wiring harness.

STEP 6. M.U.T.-III data list


Check the power supply fuse voltage.

Item No.
 Item name
 Normal condition
Item 253
 Voltage sensing of IOD Line
 System voltage
OK: Normal condition is displayed.

Q. Is the check result normal?

Go to Step 7.

Replace the ETACS-ECU.

STEP 7. Check whether the diagnosis code is reset.


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

Q. Is the diagnosis code set?

Replace the ETACS-ECU.

The trouble can be an intermittent malfunction (GROUP 00 - How to use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).