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 JUDGMENT



COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



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

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list
Check the IG voltage.

  • 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?
Go to Step 7.
Go to Step 2.

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. Connector check: C-317 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 5.
Repair the defective connector.

STEP 5. Voltage measurement at the C-317 ETACS-ECU connector.
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the voltage between the C-317 ETACS-ECU connector terminal No. 6 and the body earth.
OK: System voltage

Q. Is the check result normal?
Go to Step 7.
Go to Step 6.

STEP 6. Wiring harness check between the C-317 ETACS-ECU connector terminal No. 6 and the ignition switch (IG1)
Check the power supply line for open circuit.

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 wiring harness.

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 ).