Circuit Description
The 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 PCM monitors the system voltage over an extended length of time. If the PCM detects an excessively high system voltage, DTC P0563 will set.
Conditions for Running the DTC
| • | The engine run time is more than 20 seconds. |
| • | Engine running above 1200 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 Powertrain Control Module (PCM) receives the clear code command from the scan tool. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Starting and Charging Schematics | ||||
1 | Did you perform the Engine Electrical Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Is the battery voltage less than the specified value? | 19 Volts | 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 |
Important: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement 4.3l, Powertrain Control Module Replacement 5.0L/5.7L, Powertrain Control Module Replacement 6.5L (Diesel) or Powertrain Control Module Replacement 8.1L. Is the action complete? | -- | Go to Step 5 | -- |
5 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
