Pinpoint Test Ab: P0C03

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

NOTE: Drive Motor B refers to the electric generator. Drive Motor A refers to the electric motor.

Normal Operation and Fault Conditions

REFER to: Electric Powertrain Control - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
SOBDMC 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 Causes

Wiring, terminals or connectors
Transmission

AB1 CHECK FOR INVERTER SYSTEM CONTROLLER (ISC) DIAGNOSTIC TROUBLE CODES (DTCS)
- Ignition ON.
- Using a diagnostic scan tool, run the Inverter System Controller (ISC) self-test.
Was DTC P0A45 or P0C64 read from the Inverter System Controller (ISC)?

Yes For P0A45, GO to Pinpoint Test R For P0C64, GO to Pinpoint Test S

No GO to AB2

AB2 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) CALIBRATION LEVEL
- Verify the Inverter System Controller (ISC) is at the latest calibration level.
Is the Inverter System Controller (ISC) at the latest calibration level?

Yes GO to AB3

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

AB3 VISUAL INSPECTION OF THE HIGH VOLTAGE SYSTEM

Remove the Inverter System Controller (ISC) side cover. When removing side cover, pull cover straight out approximately 2 inches before moving upwards or damage to the high voltage interlock connector may occur. REFER to: Inverter System Controller [SOBDMC] .

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Examine all the high voltage connections for damage and loose or broken conditions.

Verify the high voltage terminal bolts are fully seated and torqued to 12 Nm

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Is a concern present?

Yes	REPAIR as necessary. CLEAR the Inverter System Controller (ISC) DTC s and REPEAT the self-test.

GO to AB4

AB4 CHECK FOR GENERATOR PHASE CONTINUITY

Use this image as reference when performing the following test.

ISC/SOBDMC, component side

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Measure and record:

Positive Lead	Measurement / Action	Negative Lead
ISC/SOBDMC pin 6, component side	Courtesy of FORD MOTOR COMPANY	ISC/SOBDMC pin 7, component side
ISC/SOBDMC pin 6, component side	Courtesy of FORD MOTOR COMPANY	ISC/SOBDMC pin 8, component side
ISC/SOBDMC pin 7, component side	Courtesy of FORD MOTOR COMPANY	ISC/SOBDMC pin 8, component side

Is the resistance less than 5 ohms?

Yes

GO to AB5

No	INSTALL a new transmission, this does not and should not include a new Inverter System Controller (ISC)/SOBDMC. REFER to: Transmission . CLEAR the Inverter System Controller (ISC) DTC s. REPEAT the self-test.

AB5 CHECK THE GENERATOR CIRCUITS FOR A SHORT TO GROUND

Use this image as reference when performing the following test.

ISC/SOBDMC, component side

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Measure and record:

Positive Lead	Measurement / Action	Negative Lead
ISC/SOBDMC pin 6, component side	Courtesy of FORD MOTOR COMPANY	Ground
ISC/SOBDMC pin 7, component side	Courtesy of FORD MOTOR COMPANY	Ground
ISC/SOBDMC pin 8, component side	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10K ohms?

Yes

GO to AB7

GO to AB6

AB6 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) FOR A SHORT TO ITS HOUSING

REMOVE the Inverter System Controller (ISC), REFER to: Inverter System Controller [SOBDMC] .

Use this image as reference when performing the following test.

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Measure and record:

Positive Lead	Measurement / Action	Negative Lead
ISC/SOBDMC pin 6, component side	Courtesy of FORD MOTOR COMPANY	Inverter System Controller (ISC) housing
ISC/SOBDMC pin 7, component side	Courtesy of FORD MOTOR COMPANY	Inverter System Controller (ISC) housing
ISC/SOBDMC pin 8, component side	Courtesy of FORD MOTOR COMPANY	Inverter System Controller (ISC) housing

Are all the resistances greater than 10K ohms?

Yes	INSTALL a new transmission, this does not and should not include a new Inverter System Controller (ISC)/SOBDMC. REFER to: Transmission . CLEAR the Inverter System Controller (ISC) diagnostic trouble codes (DTCs). REPEAT the self-test.

No	INSTALL a new Inverter System Controller (ISC), REFER to: Inverter System Controller [SOBDMC] .

AB7 CHECK THE GENERATOR RESOLVER HARNESS CIRCUITS FOR AN OPEN

Disconnect Inverter System Controller (ISC) C199B.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1111 Pin 31	Courtesy of FORD MOTOR COMPANY	C199B Pin 20
C1111 Pin 21	Courtesy of FORD MOTOR COMPANY	C199B Pin 14
C1111 Pin 32	Courtesy of FORD MOTOR COMPANY	C199B Pin 21
C1111 Pin 22	Courtesy of FORD MOTOR COMPANY	C199B Pin 15
C1111 Pin 33	Courtesy of FORD MOTOR COMPANY	C199B Pin 22
C1111 Pin 23	Courtesy of FORD MOTOR COMPANY	C199B Pin 16

Is the resistance less than 3 ohms?

Yes

GO to AB8

No	INSTALL a new harness.

AB8 CHECK FOR CORRECT INVERTER SYSTEM CONTROLLER (ISC) OPERATION

Ignition OFF.

Disconnect and inspect all Inverter System Controller (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 Inverter System Controller (ISC) connectors. Make sure they seat and latch correctly.

Install the Inverter System Controller (ISC) side cover. REFER to: Inverter System Controller [SOBDMC] .

Connect HF45 Transmission C1111.

Ignition ON.

CLEAR the Inverter System Controller (ISC) DTC s.

Ignition OFF.

Wait 5 minutes.

Ignition ON.

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

Is DTC P0C03:00 still present?

Yes	INSTALL a new transmission, this does not and should not include a new Inverter System Controller (ISC)/SOBDMC. REFER to: Transmission . CLEAR the Inverter System Controller (ISC) DTC s. 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.