Circuit Description
The engine control module (ECM) 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 ECM monitors the system voltage over an extended length of time. If the ECM 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 is below 9 volts or above 16 volts. |
| • | Engine speed is above 650 RPM. |
Conditions for Setting the DTC
The ECM detects a system voltage out of range for 30 seconds.
Action Taken When the DTC Sets
| • | The ECM will not illuminate the malfunction indicator lamp (MIL). |
| • | The ECM will command a message to be displayed. |
| • | The ECM will store conditions which were present when the DTC set as Failure Records data only. |
Conditions for Clearing the DTC
| • | The ECM 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 | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate that DTC P0560 has passed this ignition cycle? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
3 |
Does the scan tool indicate that the Ignition 1 Signal parameter is greater than the specified range? | 9-16 V | Go to Step 7 | Go to Step 4 |
4 | Using a scan tool, compare the battery voltage at the battery with the Ignition 1 Signal parameter in the ECM data list. Is the battery voltage at the battery and ECM Ignition 1 Signal 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 for a high resistance or open. Refer to Circuit Testing and Wiring Repairs . 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. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 7 |
7 | Replace the ECM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 8 | -- |
8 |
Does the scan tool indicate that DTC P0560 failed this ignition? | -- | Go to Step 3 | System OK |
