Engine Electrical
DTC P0563
Circuit Description
The engine control module (ECM) / powertrain control module (PCM) checks the system voltage to make sure that the voltage stays within the proper range. Damage to components and incorrect input can occur when the voltage is out of range. The ECM/PCM monitors the system voltage over an extended length of time. If the ECM/PCM detects an excessively high system voltage, DTC P0563 will set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0563 System Voltage High
Conditions for Running the DTC
System voltage between 9.5-18 volts.
Conditions for Setting the DTC
The ECM/PCM detects a system voltage above 17.5 volts for 10 seconds.
Action Taken When the DTC Sets
* The ECM/PCM will not illuminate the charge indicator.
* The ECM/PCM will not illuminate the malfunction indicator lamp (MIL).
* The ECM/PCM will store conditions which were present when the DTC set as Failure Records data only.
Conditions for Clearing the DTC
* The ECM/PCM 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.
* The DTC can be cleared by using the scan tool Clear DTC Information function.
Test
