Refer to
Circuit Description
The PCM continuously monitors the system voltage. The system voltage
information is taken from the PCMs ignition feed circuits. Since voltages
below 8.0 volts or above 17.1 volts, could cause improper
system operation and/or component damage. Class 2 Serial Data is shut
down when system voltage is below 9.2 volts or above 16.0 volts.
A scan tool will not display data if system voltage is outside this
range. Because of this, use a DVM in order to monitor system voltage
when checking to see if the fault is currently present.
Conditions for Running the DTC
The engine speed is greater than 1200 RPM.
Conditions for Setting the DTC
The PCM senses system voltage below 8.0 Volts for 2 seconds.
Action Taken When the DTC Sets
| • | The PCM stores DTC P0562 in memory when the diagnostic
runs and fails. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The PCM will record the operating conditions at the time the diagnostic
fails. The PCM stores this information in Failure Records. |
Conditions for Clearing the MIL/DTC
| • | A History DTC will clear after forty consecutive warm-up cycles,
if this or any other emission related diagnostic does not report any failures. |
Diagnostic Aids
Important: Remove any debris from the PCM module connector surfaces before servicing
the PCM module. Inspect the PCM module connector gaskets when diagnosing/replacing
the module. Ensure that the gaskets are installed correctly. The
gaskets prevent water intrusion into the PCM module.
| • | An extremely low voltage (below 7.5 volts) may cause the
loss of serial data and the MIL may not function. An open ignition feed circuit
causes a no start and the MIL will not illuminate. A low system
voltage may cause other DTCs to set. |
| • | Using Freeze Frame and/or Failure Records data may aid in locating
an intermittent condition. If you cannot duplicate the DTC, the information
included in the Freeze Frame and/or Failure Records data can
aid in determining how many miles since the DTC set. The Fail
Counter and Pass Counter can also aid determining how many ignition
cycles the diagnostic reported a pass and/or a fail. Operate
the vehicle within the same freeze frame conditions (RPM, load,
vehicle speed, temperature etc.) that you observed. |
