Code No.B210A +B power supply (low input)
Code No.B210B +B 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 fuse
  • Malfunction of the ETACS-ECU
  • Malfunction of battery
  • Malfunction of alternator
  • Malfunction of harness

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 8.

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-307 ETACS-ECU connector

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

STEP 5. Voltage measurement at the C-307 ETACS-ECU connector.
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the voltage between the C-307 ETACS-ECU connector terminal No. 2 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-307 ETACS-ECU connector terminal No. 2 and the fusible link (34)
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. M.U.T.-III data list
Check the power supply fuse voltage.

  • 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?
Go to Step 8.
Replace the ETACS-ECU.

STEP 8. 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 ).