P0562

Circuit Description

The PCM continuously monitors the system voltage. The system voltage information is taken from the PCM's ignition feed circuits. Voltages below 8.0 volts or above 18.0 volts causes improper system operation and/or component damage. The PCM operates in a default mode if a PCM voltage DTC sets. The PCM disables most outputs to protect the hardware if the system voltage is high. A scan tool may not display data if system voltage is below 8.0 volts. Use a DMM to monitor the system voltage in order to verify if the fault is currently present. A low voltage may cause a stalling condition, or other driveability concerns.

Conditions for Running the DTC

^ The engine run time is longer than 10 seconds.
^ The engine speed is greater than 1,000 RPM.
^ The vehicle speed is greater than 8 km/h (5 mph).

Conditions for Setting the DTC

^ The PCM senses system voltage below 8.0 volts.
^ All the above conditions are present for 5 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.
^ The PCM will command a high idle speed.
^ The transmission defaults to third gear.
^ The Torque Converter Clutch (TCC) operation is inhibited.

Conditions for Clearing the MIL/DTC

^ A History DTC will clear after forty consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
^ A last test failed (Current DTC) will clear when the diagnostic runs and does not fail.
^ Use a scan tool in order to clear the MIL/DTC.

Diagnostic Aids

Important:
^ Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing/replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM.
^ For any test that requires probing the PCM or a component harness connector, use the Connector Test Adapter Kit J 35616-A. Using this kit prevents damage to the harness/component terminals. Refer to Using Connectors Test Adapters in Diagrams.
^ The following may cause an intermittent:
- Poor connections; Refer to Intermittents and Poor Connections. Intermittent Conditions
- Corrosion
- Mis-routed harness
- Rubbed through wire insulation
- Broken wire inside the insulation
^ 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. This will isolate when the DTC failed.
^ For an intermittent condition, refer to Symptoms. Symptom Related Diagnostic Procedures

Test Description

The numbers below refer to the step numbers on the diagnostic table.

2. This step tests the Charging system under load at idle. The voltage should remain above 8 volts.