• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
12V B+ | P0562 | P0562 | P0563 | -- |
Ground | -- | P0562 | P0563 | -- |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Ignition ON, engine OFF. Parameter Normal Value: 12.6 V | |||
Ignition | 0.0 V | 0.0 V | 12.6 V |
The engine control module (ECM) monitors the 12V 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.
• | The vehicle speed is greater than 8 km/h (5 mph). |
• | The 12V system voltage is between 9.5-18 V. |
The ECM detects a 12V system voltage above 16 V.
• | The ECM will command the charge indicator to be illuminated on the instrument panel cluster (IPC). |
• | The ECM will not illuminate the malfunction indicator lamp (MIL). |
• | The ECM will store conditions, which were present when the DTC set as Fail Records data only. |
• | The ECM will command the indicator OFF after one trip in which the diagnostic test has been run and passed. |
• | A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
• | This DTC could be set by overcharging with a battery charger. |
• | A high voltage DTC in multiple modules indicates a concern in the charging system. |
Charging System Description and Operation
Control Module References for scan tool information
⇒ | If not within the specified range, refer to Charging System Test. |
⇒ | If greater than the specified range, replace the ECM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming.