Code No. P0562: Battery Voltage too Low

OPERATION

Power is directly supplied to the engine-ECU connector terminal from the battery.

FUNCTION

The engine-ECU checks open circuit in the battery line.

TROUBLE JUDGEMENT

Check Conditions

Engine starting sequence was completed.
Battery positive voltage is more than 10 V.

Judgement Criterion

Battery voltage is less than 6 V for 2 seconds.

FAIL-SAFE AND BACKUP FUNCTION

All diagnosis codes are set once failure judgement is completed.

PROBABLE CAUSES

Open/short circuit or harness damage in battery line circuit or loose connector contact
Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Temporarily place the ignition switch in LOCK (OFF) position, and 10 seconds after that, place it in ON position again.

Q. Is the diagnosis code of P0562 set?

	Go to Step 2.

	Check end.

STEP 2. Perform voltage measurement at engine-ECU connector.

Disconnect connector, and measure at harness side.
Voltage between terminal BAT1, BAT2 and body earth.

OK: System voltage

Q. Is the check result normal?

	Go to Step 3.

	Repair or replace the connector(s), or check and repair the harness of open circuit, and short circuit in BAt1, BAT2 line between battery and engine-ECU connector.

STEP 3. Check of damage in BAT1, BAT2 line between the battery and engine-ECU connector.

Q. Is the check result normal?

	Go to Step 4.

	Repair the connector(s) or wiring harness.

STEP 4. M.U.T.-III diagnosis code

Reconfirmation of diagnosis code.

Q. Is diagnosis code set?

	Replace the engine-ECU.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions).