Circuit Description
The powertrain control module (PCM) monitors the system voltage to make sure that the voltage stays within the proper range. Damage to components, and incorrect data 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 a system voltage outside an expected range for the calibrated length of time, DTC P0560 will set.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0560 System Voltage
Conditions for Running the DTC
| • | System voltage below 11 volts. |
| • | Engine speed above 1,500 RPM. |
| • | Vehicle speed below 40 km/h (25 mph). |
Conditions for Setting the DTC
The PCM detects a system voltage out of range for 2 seconds.
Action Taken When the DTC Sets
| • | The PCM will not illuminate the malfunction indicator lamp (MIL). |
| • | The PCM will command a message to be displayed. |
| • | 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 - 3.8L (L26 and L32) Connector End View Reference: Engine Controls Connector End Views in Engine Controls - 3.8L (L26 and L32) or Power and Grounding Connector End Views in Wiring Systems | ||||
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 the Ignition 1 Signal parameter is greater than the specified range? | 11 V | Go to Step 6 | Go to Step 3 |
3 | Using a scan tool compare the Battery Voltage parameter in the body control module (BCM) data list with the Ignition 1 Signal parameter in the PCM data list. Is 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. Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 7 | -- |
7 |
Does the scan tool indicate that DTC P0560 failed this ignition? | -- | Go to Step 2 | System OK |
