Engine Electrical

DTC P0563

DTC DESCRIPTOR

DTC P0563
System Voltage High

DIAGNOSTIC FAULT INFORMATION

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection

CIRCUIT/SYSTEM DESCRIPTION
The engine control module (ECM) monitors the system voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range.

CONDITIONS FOR RUNNING THE DTC
- The vehicle speed is above 8 km/h (5 mph).
- The system voltage is between 9.5-18 volts.

CONDITIONS FOR SETTING THE DTC
The ECM detects a system voltage above 16 volts for less than 1 second.

ACTION TAKEN WHEN THE DTC SETS
- The ECM will command the charge indicator and or warning message to be illuminated on the instrument panel cluster (IPC) and the driver information center (DIC), if equipped.
- The ECM will not illuminate the malfunction indicator lamp (MIL).
- The ECM will store conditions, which were present when the DTC set as Fail Records data only.

CONDITIONS FOR CLEARING THE DTC
- The ECM will command the message OFF after one trip in which the diagnostic test has been run and passed.
- The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
- Using the scan tool Clear DTC Information function can clear the DTC.

CIRCUIT/SYSTEM VERIFICATION
With the scan tool installed, ignition ON and the engine OFF, observe the Ignition 1 Signal parameter in the ECM data list. The Ignition 1 Signal parameter should read 16 volts or less.

CIRCUIT/SYSTEM TESTING
1. Measure the voltage at the battery terminals and compare it with the Ignition 1 Signal parameter in the ECM data list. Verify that battery and ignition 1 signal readings do not differ more than 0.5 volt.
- If greater than 0.5 volt test the ignition 1, ground circuits of the ECM for high resistance or replace the ECM.
2. Go to Charging System Test Charging System Test

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

Control Module References for ECM replacement, setup, and programming.