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 / B+ | 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 V. |
Conditions for Setting the DTC
The ECM detects a system voltage below 10 V for 5 seconds.
Action Taken When the DTC Sets
| • | The instrument panel cluster (IPC) illuminates the charge indicator. |
| • | The driver information center (DIC) displays the CHARGING SYSTEM / GENERATOR FAULT warning message. |
Conditions for Clearing the DTC
DTC P0562 is a C type DTC.
Diagnostic Aids
| • | A low voltage DTC in multiple modules indicates a concern in the charging system. |
| • | Inspect the ECM ground connections, to verify that they are clean and tight. |
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, accessories OFF, measure and record the voltage at the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.5 V.
- Observe the scan tool ECM Ignition 1 Signal parameter. The reading should be between 12.6 and 15.5 V.
| ⇒ | If not within the specified range, refer to Charging System Test |
Circuit/System Testing
- Ignition OFF, disconnect the harness connectors at the ECM.
- Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 Ω between the ground circuit terminal 73 X2.
- Ignition ON, verify a test lamp illuminates between the IGN / B+ circuits terminals listed below and ground.
- If the circuits test normal replace the ECM.
| ⇒ | If greater than the specified value, test the ground circuits for an open/high resistance. |
| • | IGN terminal 18 X1 |
| • | IGN terminal 19 X1 |
| • | IGN terminal 13 X2 |
| • | B+ terminal 20 X1 |
| ⇒ | If the test lamp does not illuminate , test the IGN / B+ circuits for 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.
