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


These diagnosis codes are set when the IG voltage decreases to the specified value or less (code No. B2353) or increases to the specified value or more (code No. B2354). However, when the status returns to normal, the code Nos. B2353 and B2354 are automatically erased.

COMMENTS ON TROUBLE SYMPTOM


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

PROBABLE CAUSES



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
 Battery voltage
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 2.
Replace the ETACS-ECU.

STEP 2. Connector check: C-317 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 3.
Repair the defective connector.

STEP 3. 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: Battery voltage

Q. Is the check result normal?
Go to Step 5.
Go to Step 4.

STEP 4. 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 5. 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 ).