Code No.B2353 Ignition power supply (low input)
Code No.B2354 Ignition power supply (high input)


caution Before replacing the ECU, ensure that the input and output signal circuits are normal.

TROUBLE JUDGEMENT



COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of power supply circuit
  • Malfunction of the battery
  • Malfunction of the alternator
  • Malfunction of harness
  • Malfunction of the ignition switch
  • Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III data list




  • Turn the ignition switch to the ON position.
Item No.
 Item name
 Normal condition
Item 254
 IG voltage
 System voltage
OK: Normal condition is displayed.

Q. Is the check result normal?





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. Connector check: C-417 ETACS-ECU connector


Q. Is the check result normal?





STEP 5. Voltage measurement at the C-417 ETACS-ECU connector.


(1)Measure by backprobing without disconnecting the connector.
(2)Turn the ignition switch to the "ON" position.
(3)Measure the voltage between the C-417 ETACS-ECU connector terminal No. 6 and the body earth.
OK: System voltage

Q. Is the check result normal?





STEP 6. Wiring harness check between the C-417 ETACS-ECU connector terminal No. 6 and the ignition switch (IG1)



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?