Pinpoint Test BS : P0562

NOTE: The Inverter System Controller (ISC) is referred to as the SOBDMC (Secondary On-Board Diagnostic Control Module C) in the scan tool.

Normal Operation and Fault Conditions

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
SOBDMC P0562:00	System Voltage Low: No Sub Type Information	This DTC sets when the 12V Battery voltage is low or by an Inverter System Controller (ISC) ground issue.

Possible Sources

BS1 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) VBATT CIRCUIT VOLTAGE

Measure:

Positive Lead	Measurement / Action	Negative Lead
C199A-34	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 8 volts?

Yes

GO to BS2

No	DIAGNOSE the low battery voltage symptom

BS2 MEASURE VOLTAGE DROP OF DCDC (DIRECT CURRENT/DIRECT CURRENT CONVERTER CONTROL MODULE) B+ CABLE

Measure:

NOTE: Place the positive lead on the DC/DC Converter B+ stud.

Positive Lead	Measurement / Action	Negative Lead
C1457C (12V DC/DC B+)	Courtesy of FORD MOTOR COMPANY	12V BATTERY B+

Is the voltage drop less than 0.5 volt?

Yes	Verify the G102 body connection is OK. If not OK, REPAIR the connection. If OK, REPAIR 12V Battery B- circuit or INSTALL a new 12V battery negative cable if necessary. GO to BS3 If there are NO DTC's, GO to BS3

No	VERIFY the high current fuse box fuse 4 (300A) is OK. If OK, REPAIR circuit. If not OK, REFER to OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short. INSTALL new B+ cables, if necessary.

BS3 VERIFY THE DCDC (DIRECT CURRENT/DIRECT CURRENT CONVERTER CONTROL MODULE) CASE GROUND

Measure:

NOTE: Place the positive lead on the DC/DC Converter Case.

Positive Lead	Measurement / Action	Negative Lead
Courtesy of FORD MOTOR COMPANY DC/DC Case	Courtesy of FORD MOTOR COMPANY	Courtesy of FORD MOTOR COMPANY

Is the voltage drop less than 0.5V?

Yes	DIAGNOSE the low battery voltage symptom

No	INSPECT and REPAIR the DCDC case ground issue or the battery ground for corrosion.