Symptom Chart
Condition | Possible Sources | Actions |
|---|---|---|
System voltage high | Refer to the Pinpoint Test | GO to Pinpoint Test A |
System voltage low or battery is discharged | Refer to the Pinpoint Test | GO to Pinpoint Test B |
The generator is noisy | Refer to the Pinpoint Test | GO to Pinpoint Test C |
Radio interference | Refer to the Pinpoint Test | GO to Pinpoint Test D |
Charging system warning indicator is never or always on | Wiring, terminals or connectors IPC Generator PCM | RETRIEVE Diagnostic Trouble Codes (DTCs) from all modules. If any Diagnostic Trouble Codes (DTCs) are found, Refer to DTC Chart in this section. If no Diagnostic Trouble Codes (DTCs) are found, REFER to: Instrumentation, Message Center and Warning Chimes (413-01) . |
Load Shed Message Displays in IPC message center and/or centerstack infotainment display | Refer to the Pinpoint Test | GO to Pinpoint Test H |
Battery Saver - System Off displays in centerstack infotainment display | Refer to the Pinpoint Test | GO to Pinpoint Test H |
Pinpoint Tests
System Voltage High
Refer to Wiring Diagrams Cell 12 for schematic and connector information.
NOTE: Diagnostic Trouble Code (DTC) P0563 can be set if the vehicle has been recently jump started or the battery has been recently charged. The battery may become discharged due to excessive load(s) on the charging system from aftermarket accessories or if vehicle accessories have been operating for an extended period of time without the engine running.
Normal Operation and Fault Conditions
With the engine running, the charging system supplies voltage to the battery and the vehicle electrical system through the high current BJB and battery B+ cable. The voltage that is supplied to the vehicle electrical system is used for the operation of the various vehicle systems and modules. Many modules monitor this voltage and if it rises above or below their calibrated setpoints, a DTC sets.
Diagnostic Trouble Code (DTC) Fault Trigger Conditions
DTC | Description | Fault Trigger Conditions |
|---|---|---|
P0563 System Voltage High | This DTC sets in the PCM when the PCM detects voltage from the charging system greater than 15.9 volts with vehicle speed above 8 km/h (5 mph). | |
P1397 System Voltage Out of Self-Test Range | If the voltage rises above or drops below the calibrated set point, the PCM sets this DTC. This DTC may also be set if the vehicle has been recently jump started or has had a discharged battery. |
Possible Sources
Battery Generator Engine, generator or battery ground PCM Wiring, terminals or connectors
Visual Inspection and Diagnostic Pre-checks
Inspect the high current BJB for loose or corroded connections.
PINPOINT TEST A : SYSTEM VOLTAGE HIGH
NOTE: Make sure battery voltage is greater than 12.2 volts prior to and during this pinpoint test.
NOTE: Do not have a battery charger attached during vehicle testing.
A1 PERFORM INSPECTION AND VERIFICATION
Perform Inspection and Verification procedure in this section.
Was an obvious cause for an observed or reported concern found?
Yes | CORRECT the cause as necessary. |
|---|---|
No | GO to A2 |
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.