Component Location
General Description

The purpose of the System Voltage is to detect an excessively low or high system voltage that may be caused by a malfunctioning charging system.

System Voltage is the ignition voltage potential at the Powertrain Control Module (ECM)

ECM measures and compares voltage from ignition key and each relay. With this mechanism, ECM knows if the main relay switch turns on after IG on or if turns OFF after IG off.

DTC Description

If the system voltage is over 17 V during 0.2 sec, ECM sets DTC P0563.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

•

Voltage check, high

1.

Poor connection

2.

Charging system

3.

Main relay

Enable Conditions

•

Engine speed > 2000rpm

Threshold Value

•

Voltage ＞ 16.96 V

Diagnostic Time

•

0.2 sec

MIL ON Condition

•

3 driving cycle

Diagnostic Circuit Diagram
note
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