Circuit Description
The engine control module (ECM) monitors the system voltage to make sure that the voltage stays within the proper range. If the ECM 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 speed is more than 500 RPM.
Conditions for Setting the DTC
Ignition 1 voltage sensor is less than 0.9V.
Action Taken When the DTC Sets
| • | The ECM stores the DTC information into memory when the diagnostic runs and fails. |
| • | The ECM will store conditions which were present when the DTC set as Failure Records data only. |
| • | The ECM 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 ECM receives the clear code command from the scan tool. |
Step | Action | Values | 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) data list. Does the scan tool display ignition 1 voltage greater than the specified value? | 10.5 V | Go to Step 4 | Go to Step 3 |
3 | Test the ignition feed circuit to the ECM 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 for an open or a short to ground. Refer to Wiring Repairs . Is the action complete? | -- | Go to Step 7 | -- |
6 | Replace the ECM. 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 |
