Circuit Description
The powertrain control module (PCM) continuously monitors that the system voltage stays within the proper range. If the PCM detects an excessively high system voltage, DTC P0563 will set. A high voltage condition may cause a stalling condition or other driveability concerns.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0563 System Voltage High
Conditions for Running the DTC
| • | The engine run time is more than 20 seconds. |
| • | Engine running above 1,200 RPM |
| • | Vehicle speed above 8 km/h (5 mph) |
Conditions for Setting the DTC
| • | The PCM senses the system voltage is above 19 volts. |
| • | All of the conditions are present for 5 seconds. |
Action Taken When the DTC Sets
| • | The PCM stores DTC P0563 in the PCM memory when the diagnostic runs and fails. |
| • | The PCM will record the operating conditions at the time the diagnostic fails. The PCM stores this information in Failure Records. |
| • | The PCM disables most outputs. |
| • | The transmission defaults to a predetermined gear. |
| • | The torque converter clutch (TCC) operation is inhibited. |
| • | The instrument panel cluster (IPC) displays a message. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
Conditions for Clearing the DTC
| • | The Conditions for Setting the DTC are no longer present. |
| • | A history DTC will clear after 40 malfunction-free ignition cycles. |
| • | The PCM receives the clear code command from the scan tool. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Starting and Charging Schematics Connector End View Reference: Engine Electrical Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Is the battery voltage less than the specified value? | 19 V | Go to Step 4 | Go to Step 3 |
3 | Replace the generator. Refer to Generator Replacement . Is the action complete? | -- | Go to Step 5 | -- |
4 | Replace the powertrain control module (PCM) . Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Is the action complete? | -- | Go to Step 5 | -- |
5 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
