Pinpoint Test CE: P0C55

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

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

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
SOBDMC P0C55:00	Drive Motor 'A' Position Sensor Circuit 'B': No Sub Type Information	This DTC sets when a wiring concern in the harness between the Inverter System Controller (ISC) and the transmission is detected.

Possible Causes

Inverter System Controller (ISC) calibration
Wiring, terminals or connectors
Transmission

CE1 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) CALIBRATION LEVEL

NOTE: Wiring overlays or repinning of circuits are NOT appropriate for DTC P0C55 due to risk of hardware damage.
- 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 CE2

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

CE2 CHECK FOR INVERTER SYSTEM CONTROLLER (ISC) CMDTC (CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODE) P0C55

Ignition ON.

Using a diagnostic scan tool, check for CMDTC s.

Is CMDTC P0C55 present?

Yes

GO to CE3

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

CE3 VISUAL INSPECTION OF THE LOW VOLTAGE SYSTEM
- Ignition OFF.
- Depower the high voltage system. REFER to: High Voltage System De-energizing .
- Visually inspect all the low voltage cables.
- Make sure all the low voltage connectors are correctly and securely connected.
- Examine all the low voltage cables and connectors for damaged, burned or overheated insulation and loose or broken conditions.
Is a concern present?

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

No GO to CE4

CE4 CHECK THE MOTOR RESOLVER CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect HF 45 Transmission C1111.

Disconnect Inverter System Controller (ISC) C199B.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1111 Pin 13	Courtesy of FORD MOTOR COMPANY	C199B Pin 1
C1111 Pin 3	Courtesy of FORD MOTOR COMPANY	C199B Pin 2
C1111 Pin 12	Courtesy of FORD MOTOR COMPANY	C199B Pin 7
C1111 Pin 2	Courtesy of FORD MOTOR COMPANY	C199B Pin 8
C1111 Pin 1	Courtesy of FORD MOTOR COMPANY	C199B Pin 13
C1111 Pin 11	Courtesy of FORD MOTOR COMPANY	C199B Pin 19

Is the resistance less than 5 ohms?

Yes

GO to CE5

No	INSTALL a new harness.

CE5 CHECK THE MOTOR RESOLVER CIRCUITS FOR A SHORT TO GROUND

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1111 Pin 1	Courtesy of FORD MOTOR COMPANY	Ground
C1111 Pin 11	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance above 10K ohms?

Yes

GO to CE6

No	INSTALL a new harness.

CE6 CHECK THE MOTOR RESOLVER RESISTANCE

Use this image as reference when performing the following test.

Connector C1111 component side

Courtesy of FORD MOTOR COMPANY

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
HF45 Transmission C1111 pin 1, component side	Courtesy of FORD MOTOR COMPANY	HF45 Transmission C1111 pin 11, component side

Is the resistance between 7.6 and 11.4 ohms?

Yes

GO to CE7

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.

CE7 CHECK THE MOTOR RESOLVER RESISTANCE

Use this image as reference when performing the following test.

Connector C1111 component side

Courtesy of FORD MOTOR COMPANY

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
HF45 Transmission C1111 pin 3, component side	Courtesy of FORD MOTOR COMPANY	HF45 Transmission C1111 pin 13, component side

Is the resistance between 11.6 and 17.4 ohms?

Yes

GO to CE8

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.

CE8 CHECK THE MOTOR RESOLVER RESISTANCE

Use this image as reference when performing the following test.

Connector C1111 component side

Courtesy of FORD MOTOR COMPANY

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
HF45 Transmission C1111 pin 2, component side	Courtesy of FORD MOTOR COMPANY	HF45 Transmission C1111 pin 12, component side

Is the resistance between 11.2 and 16.8 ohms?

Yes

GO to CE9

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.

CE9 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 the Inverter System Controller (ISC) connectors. Make sure they seat and latch correctly.

Connect HF 45 Transmission C1111.

Ignition ON.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, GO to Pinpoint Test BU
(In step BU4 continue through to step BU5 regardless of DTC presence.)

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.