Pinpoint Test AF: P0C03

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

Normal Operation and Fault Conditions

REFER to: Front Electric Drive Assembly - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
SOBDMB P0C03:00	Drive Motor "B" Current Low: No Sub Type Information	This DTC sets when the 3 phase current is not within the expected range or when the resolver circuitry is incorrectly wired.

Possible Sources

Wiring, terminals or connectors
Front electric drive assembly

AF1 CHECK FOR SECONDARY INVERTER SYSTEM CONTROLLER (S-ISC) DIAGNOSTIC TROUBLE CODES (DTCS)

NOTE: Drive Motor B refers to the electric generator. Drive Motor A refers to the electric motor.
- Ignition ON.
- Using a diagnostic scan tool, run the Secondary Inverter System Controller (S-ISC) self-test.
Was DTC P0A45, P0A47 or P0C64 read from the Secondary Inverter System Controller (S-ISC)?

Yes GO to Pinpoint Test V

No GO to AF2

AF2 CHECK THE SECONDARY INVERTER SYSTEM CONTROLLER (S-ISC) CALIBRATION LEVEL
- Verify the Secondary Inverter System Controller (S-ISC) is at the latest calibration level.
Is the Secondary Inverter System Controller (S-ISC) at the latest calibration level?

Yes GO to AF3

No UPDATE the Secondary Inverter System Controller (S-ISC) to the latest calibration level.

AF3 VISUAL INSPECTION OF THE HIGH VOLTAGE SYSTEM
- Ignition OFF.
- De-energize the high voltage system. REFER to: High Voltage System De-energizing .
- Disconnect Secondary Inverter System Controller (S-ISC) C4210B.
- Disconnect Front electric drive C4048.
- Examine all the high voltage connections for damage and loose or broken conditions.
Is a concern present?

Yes REPAIR as necessary. CLEAR the Secondary Inverter System Controller (S-ISC) DTCs and REPEAT the self-test.

No GO to AF4

AF4 CHECK THE PHASE WIRING FOR AN OPEN

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1201-1	Courtesy of FORD MOTOR COMPANY	C1458C-3
C1201-2	Courtesy of FORD MOTOR COMPANY	C1458C-2
C1201-3	Courtesy of FORD MOTOR COMPANY	C1458C-1

Is the resistance less than 3ohms?

Yes

GO to AF5

No	INSTALL a new high voltage cable between the Secondary Inverter System Controller (S-ISC) and the front electric drive assembly. REFER to: High Voltage Battery Cables CLEAR the Secondary Inverter System Controller (S-ISC) DTCs. REPEAT the self-test.

AF5 CHECK THE PHASE WIRING FOR A SHORT TO SHIELD

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1458C-3	Courtesy of FORD MOTOR COMPANY	C1458C Cable Shield
C1458C-2	Courtesy of FORD MOTOR COMPANY	C1458C Cable Shield
C1458C-1	Courtesy of FORD MOTOR COMPANY	C1458C Cable Shield

Is the resistance greater than 10K ohms?

Yes

GO to AF6

No	INSTALL a new high voltage cable between the Secondary Inverter System Controller (S-ISC) and the front electric drive assembly. REFER to: High Voltage Battery Cables CLEAR the Secondary Inverter System Controller (S-ISC) DTCs. REPEAT the self-test.

AF6 CHECK THE PHASE WIRING FOR A SHORT TO GROUND

Connect Front electric drive C4048.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1458C-3	Courtesy of FORD MOTOR COMPANY	Ground
C1458C-2	Courtesy of FORD MOTOR COMPANY	Ground
C1458C-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10K ohms?

Yes

GO to AF7

GO to AF8

AF7 CHECK THE ELECTRIC MOTOR FOR CONTINUITY

Disconnect Front electric drive C4048.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1201 pin 1, component side	Courtesy of FORD MOTOR COMPANY	C1201 pin 2, component side
C1201 pin 1, component side	Courtesy of FORD MOTOR COMPANY	C1201 pin 3, component side
C1201 pin 2, component side	Courtesy of FORD MOTOR COMPANY	C1201 pin 3, component side

Are the resistances less than 3 ohms?

Yes

GO to AF9

No	INSTALL a new front electric drive assembly. REFER to: Front Electric Drive Assembly CLEAR the Secondary Inverter System Controller (S-ISC) DTCs. REPEAT the self-test.

AF8 CHECK THE ELECTRIC MOTOR FOR A SHORT TO GROUND

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1201 pin 1, component side	Courtesy of FORD MOTOR COMPANY	Ground
C1201 pin 2, component side	Courtesy of FORD MOTOR COMPANY	Ground
C1201 pin 3, component side	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10K ohms?

Yes	INSTALL a new high voltage cable between the Secondary Inverter System Controller (S-ISC) and the front electric drive assembly. REFER to: High Voltage Battery Cables .

No	INSTALL a new front electric drive assembly. REFER to: Front Electric Drive Assembly CLEAR the Secondary Inverter System Controller (S-ISC) DTCs. REPEAT the self-test.

AF9 CHECK FOR CORRECT SECONDARY INVERTER SYSTEM CONTROLLER (S-ISC) OPERATION

Ignition OFF.

Disconnect and inspect all Secondary Inverter System Controller (S-ISC) 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 all previously disconnected connectors. Make sure they seat and latch correctly.

Re-energize the high voltage system. REFER to: High Voltage System De-energizing .

Ignition ON.

CLEAR the Secondary Inverter System Controller (S-ISC) DTCs.

Ignition OFF.

Wait 5 minutes.

Ignition ON.

Using a diagnostic scan tool, run the Secondary Inverter System Controller (S-ISC) self-test.

Is DTC P0C03:00 still present?

Yes	INSTALL a new front electric drive assembly. REFER to: Front Electric Drive Assembly CLEAR the Secondary Inverter System Controller (S-ISC) DTCs. REPEAT the self-test.

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.