Circuit Description
The engine control module (ECM)/powertrain control module (PCM) monitors the system voltage to make sure that the voltage stays within the proper range. If the ECM/PCM detects an excessively low system voltage, DTC P0562 will set.
When the charging system detects a fault, the instrument panel cluster (IPC) displays a message or the charge indicator will light.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0562 System Voltage Low
Conditions for Running the DTC
| • | The engine run time is more than 20 seconds and above 1,200 RPM. |
| • | The vehicle speed is above 8 km/h (5 mph). |
Conditions for Setting the DTC
The ECM/PCM detects an improper voltage below 11 volts for 5 seconds.
Action Taken When the DTC Sets
| • | The ECM/PCM stores the DTC information into memory when the diagnostic runs and fails. |
| • | The ECM/PCM will store conditions which were present when the DTC set as Failure Records data only. |
| • | The ECM/PCM disables most outputs. |
| • | The transmission defaults to a predetermined gear. |
| • | The torque converter clutch (TCC) operation is inhibited. |
| • | The 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. |
Step | Action | Value(s) | 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 | |
2 | With the scan tool monitor the ignition 1 signal voltage in the engine control module (ECM)/powertrain control module (PCM) data list. Does the scan tool display ignition 1 voltage greater than the specified value? | 11 V | Go to Step 4 | Go to Step 3 |
3 | Test the ignition feed circuit to the ECM/PCM for high resistance or open. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 7 | Go to Step 5 |
4 |
Did you find and correct the condition? | -- | Go to Step 7 | Go to Step 6 |
5 | Repair the ignition feed circuit to the ECM/PCM for an open or a short to ground. Refer to Wiring Repairs. Is the action complete? | -- | Go to Step 7 | -- |
6 | Replace the ECM/ PCM. Refer to Control Module References for replacement, setup, and programming. Is the action complete? | -- | Go to Step 7 | -- |
7 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
