Is the voltage drop less than 0.5 volt?
Yes | GO to A13 |
|---|---|
No | REPAIR the affected circuit(s). |
A13 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION
Ignition OFF. Disconnect and inspect all PCM connectors. Repair:
corrosion (install new connector or terminals – clean module pins) damaged or bent pins – install new terminals/pins pushed-out pins – install new pins as necessary
Reconnect the PCM connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is still present.
Is the concern still present?
Yes | CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new PCM. REFER to: Powertrain Control Module (PCM) (303-14C Electronic Engine Controls - 5.0L 32V Ti-VCT/5.0L Ti-VCT V8 (308kW/418PS), Removal and Installation). CLEAR all Diagnostic Trouble Codes (DTCs) in all modules. |
|---|---|
No | The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues. |
System Voltage Low or Battery is Discharged
Refer to Wiring Diagrams Cell 12 for schematic and connector information.
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 PCM monitors this B+ voltage through its own voltage supply circuit.
Diagnostic Trouble Code (DTC) Fault Trigger Conditions
DTC | Description | Fault Trigger Conditions |
|---|---|---|
P0562 System Voltage Low | If voltage drops 1.5 volts or more below the generator voltage desired (calculated by the PCM), this DTC sets after 30 seconds. | |
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 Fuses or fusible links Generator Generator clutch (if equipped) PCM High current BJB Wiring, terminals or connectors
Visual Inspection and Diagnostic Pre-checks
Inspect for abnormal ignition-off current drain(s). Inspect the battery. Inspect the high current BJB for loose or corroded connections. Gen "A" Sense Gen B+ Generator clutch (if equipped)
PINPOINT TEST B : SYSTEM VOLTAGE LOW OR BATTERY IS DISCHARGED
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.
B1 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. |
|---|
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.