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P0563 Hino Fault Code: Battery Voltage – Out Of Range (Out Of Range High)

05/01/2026

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Description Of Malfunction

Excessively high voltage has been detected in the ECU power supply.

DTC Set Condition

DTC Detection Condition:

No other DTC is detected.

Judgment Criteria:

Engine ECU power supply voltage is 16 V or more.
Failure timer is more than 3 seconds.

Reset Condition

After restoration to normal condition.

Indication, Warning Or System Control Regulation When The DTC Is Set

MIL: OFF
SVS light: ON

Pre – Inspection Work

Check that the battery voltage is in the normal range.

After – Inspection Work

Clear all past DTCs.
Check that no DTC is stored after test drive.

Possible Causes

Fusible Link, FUSE: Fusing, irregular contact, partial engagement.
Alternator failure (abnormal voltage or requires adjustment).
ECU: Malfunction.

Inspection Procedure

Troubleshooting Steps

Step 1) Inspect the fuse or fusible link.

Check for fusing or improper fit.

Were any failures found?

Yes – Connect the fusible link properly or replace. Clear all past DTCs. Check that no DTC is detected after test drive.

No – Go to Step 2.

Step 2) Inspect the connection of the battery cable.

Check if the battery cable is properly installed (tightly fastened).

Each battery terminal.
Alternator terminal.

Were any failures found?

Yes – Connect properly. If necessary, repair the cable. Clear all past DTCs. Check that no DTC is detected after test drive.

No – Go to Step 3.

Step 3) Inspect the alternator.

Start the engine.
Use the electrical tester to measure the voltage between the alternator B terminal and ground.

MEASUREMENT CONDITIONS	TESTER CONNECTIONS	STANDARD VALUES
Engine idling	Alternator B – Ground	P0562: 13.5 V or more
Engine idling	Alternator B – Ground	P0563: 14.6 V or less

Do the measurements meet the standard value?

Yes – Go to Step 4.

No – Repair or replace the alternator.

Clear all past DTCs. Check that no DTC is detected after test drive.

Step 4) Inspect the engine ECU power supply.

Set the starter switch to the “LOCK” position.
Connect the signal check harness to the engine ECU.
Start the engine.
Use the electrical tester to measure the voltage between the terminals of the engine ECU (signal check harness).

MEASUREMENT CONDITIONS

TESTER CONNECTIONS

STANDARD VALUES

Engine idling

Engine ECU (signal check

harness) (+) – (-)

VB1(V18) – PGD1(V39)

VB2(V38) – PGD2(V59)

VB3(V58) – PGD3(V79)

VB4(V78) – PGD4(V80)

10 – 16 V

Do the measurements meet the standard value?

Yes – Go to Step 5.

No – Check the engine ECU wire harness (power supply circuit). Repair or replace parts as needed. Clear all past DTCs. Check that no DTC is detected after test drive.