For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC P0562: System Voltage LowDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
IGN I | P0562 | P0562 | -- | -- |
Ground | -- | P0562 | -- | -- |
Circuit/System Description
The engine control module (ECM) monitors the system voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur when the voltage is out of range.
Conditions for Running the DTC
| • | The vehicle speed is above 8 km/h (5 mph). |
| • | The system voltage is between 9.5-18 volts. |
Conditions for Setting the DTC
The ECM detects a system voltage below 10 volts for 5 seconds.
Action Taken When the DTC Sets
DTC P0562 is a C type DTC.
Conditions for Clearing the DTC
DTC P0562 is a C type DTC.
Diagnostic Aids
| • | A low voltage DTC set in multiple control modules indicates a concern in the charging system. |
| • | A low voltage value in multiple control modules indicates a concern in the charging system. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Charging System Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Engine running measure and record the voltage at the battery terminals. Verify that the battery voltage is 12.6-15.5 volts.
- Engine running, observe the scan tool battery voltage parameter.
- Verify the battery and scan tool battery voltage parameter readings do not differ more than 2.0 volts.
| ⇒ | If the battery voltage is not within the specified range, refer to Charging System Test |
Circuit/System Testing
- Verify that DTC P0562 is set as current.
- Ignition OFF, disconnect the harness connectors at the ECM.
- Ignition OFF, test for less than 3.0 ohms between the ground circuit terminal 1 X3 to ground.
- Ignition ON, verify a test lamp illuminates between the Ignition 1 signal circuits terminal 31 X2 and terminal 47 X2 to ground.
- Ignition ON, verify a test lamp illuminates between the battery positive voltage circuit terminal 32 X2 and ground.
- If all circuits test normal, replace the ECM.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp did not illuminate , test the affected Ignition 1 circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp did not illuminate , test the B+ circuit for a short to ground or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming.
