Circuit Description
The powertrain control module (PCM) monitors the system voltage to make sure that the voltage stays within the proper range. If the 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
| • | Engine run time more than 20 seconds and above 1,200 RPM. |
| • | Vehicle speed above 8 km/h (5 mph). |
Conditions for Setting the DTC
The PCM detects an improper voltage below 11 volts for 5 seconds.
Action Taken When the DTC Sets
| • | The PCM stores the DTC information into memory when the diagnostic runs and fails. |
| • | The PCM will store conditions which were present when the DTC set as Failure Records data only. |
| • | The 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. |
| • | The PCM receives the clear code command from the scan tool. |
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 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
With the scan tool monitor the Ignition 1 signal voltage in the 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 PCM for high resistance or open. 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 |
4 |
Did you find and correct the condition? | -- | Go to Step 7 | Go to Step 6 |
5 | Repair the ignition feed circuit to the PCM for an open or a short to ground. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | Go to Step 7 | -- |
6 | Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you compete the replacement? | -- | Go to Step 7 | -- |
7 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
