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



COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of power supply fuse
  • Malfunction of the ETACS-ECU
  • Malfunction of the battery
  • Malfunction of the alternator
  • Malfunction of harness

DIAGNOSIS PROCEDURE


STEP 1. Power supply fuse check


Q. Is the fuse in good condition?





STEP 2. Battery check



Q. Is the battery in good condition?





STEP 3. Charging system check



Q. Is the charging system in good condition?





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?





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?





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




  • Ignition switch: OFF
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?





STEP 7. Check whether the diagnosis code is reset.



(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?