Pinpoint Test Cd: P0C53

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 P0C53:00	Drive Motor 'A' Position Sensor Circuit 'A' High: 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
Inverter System Controller (ISC)

CD1 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) CALIBRATION LEVEL

NOTE: Wiring overlays or repinning of circuits are NOT appropriate for DTC P0C53 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 CD2

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

CD2 CHECK FOR INVERTER SYSTEM CONTROLLER (ISC) CMDTC (CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODE) P0C53

Ignition ON.

Using a diagnostic scan tool, check for CMDTC s.

Was CMDTC P0C53 set in the Inverter System Controller (ISC)?

Yes

GO to CD3

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.

CD3 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 CD4

CD4 CHECK THE MS1 CIRCUIT FOR A SHORT TO VOLTAGE

Disconnect HF 45 Transmission C1111.

Disconnect Inverter System Controller (ISC) C199B.

Ignition ON.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1111 Pin 12	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	INSTALL a new harness.

GO to CD5

CD5 CHECK THE MS3 CIRCUIT FOR A SHORT TO VOLTAGE

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1111 Pin 2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	INSTALL a new harness.

GO to CD6

CD6 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.