Circuit Description
The engine control module (ECM)/powertrain control module (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 ECM/PCM monitors the system voltage over an extended length of time. If the ECM/PCM detects an excessively low system voltage, DTC P0562 will set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0562 System Voltage Low
Conditions for Running the DTC
System voltage is between 9.5-18 volts.
Conditions for Setting the DTC
The ECM/PCM detects a system voltage below 10.5 volts for 10 seconds.
Action Taken When the DTC Sets
| • | The ECM/PCM will not illuminate the charge indicator. |
| • | The ECM/PCM will not illuminate the malfunction indicator lamp (MIL). |
| • | The ECM/PCM will store conditions which were present when the DTC set as Failure Records data only. |
Conditions for Clearing the DTC
| • | The ECM/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 | Values | Yes | No |
|---|---|---|---|---|
Connector End View Reference: Inline Harness Connector End Views in Wiring Systems, Powertrain Control Module Connector End Views in Engine Controls - 2.0L or Engine Control Module Connector End Views in Engine Controls - 2.2L (L61) | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the scan tool indicate that DTC P0562 has passed this ignition cycle? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the scan tool indicate that the Ignition 1 parameter is greater than the specified range? | 10.5 V | Go to Step 7 | Go to Step 4 |
4 | Measure the voltage at the battery terminals and compare it with the Ignition 1 parameter in the engine controls data list. Are the battery voltage and engine control module (ECM)/powertrain control module (PCM) Ignition 1 readings different by more than the value specified? | 0.5 V | Go to Step 5 | Go to Charging System Test |
5 | Test the battery positive voltage circuit of the ECM/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 8 | Go to Step 6 |
6 | Inspect for poor connections at the harness connector of the ECM/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 8 | Go to Step 7 |
7 |
Important: The replacement ECM/PCM must be programmed. Replace the ECM/PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 8 | -- |
8 |
Does the scan tool indicate that DTC P0562 failed this ignition? | -- | Go to Step 3 | System OK |
