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 low system voltage, DTC P0562 will set.
Conditions for Running the DTC
| • | Engine speed above 1500 RPM. |
| • | System voltage between 9.5 and 18 volts. |
| • | Vehicle speed is above 8 km/h (5 mph). |
Conditions for Setting the DTC
The PCM detects a system voltage below 10 volts for 5 seconds.
Action Taken When the DTC Sets
| • | The PCM will command a message to be displayed. |
| • | The PCM will not illuminate the Malfunction Indicator Lamp (MIL). |
| • | The PCM will store conditions which were present when the DTC set as Fail Records data only. |
Conditions for Clearing the DTC
| • | The 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. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics in Engine Controls -- 5.7 L | ||||
1 | Did you perform the Engine Electrical Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate that the Ignition 1 Signal parameter is greater than the specified range? | 10.5 V | Go to Step 6 | Go to Step 3 |
3 | Measure the voltage at the battery and compare it with the Ignition 1 Signal parameter in the PCM data list Are the battery voltage and PCM Ignition 1 readings different by more than the value specified? | 0.5 V | Go to Step 4 | Go to Charging System Test |
4 | Test the battery positive voltage circuit of the PCM for a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 7 | Go to Step 5 |
5 | Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 7 | Go to Step 6 |
6 |
Important: The replacement PCM must be programmed. Refer to Powertrain Control Module Programming in Engine Controls 5.7 L. Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls 5.7 L. Is action complete? | -- | Go to Step 7 | -- |
7 |
Does the scan tool indicate that DTC P0562 failed this ignition? | -- | Go to Step 2 | System OK |
