Pinpoint Test AF: P0C66

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 P0C66:00	Generator Position Sensor Circuit 'A' Low: No Sub Type Information	This DTC sets when a short to ground is detected in the generator resolver circuit.

Possible Causes

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

AF1 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) CALIBRATION LEVEL

NOTE: Wiring overlays or repinning of circuits are NOT appropriate for DTC P0C66 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 AF2

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

AF2 CHECK FOR CMDTC (CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODE) P0C66

Ignition ON.

Using a diagnostic scan tool, retrieve all Inverter System Controller (ISC) CMDTC s.

Was CMDTC P0C66 read from the Inverter System Controller (ISC)?

Yes

GO to AF3

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.

AF3 VISUAL INSPECTION OF THE LOW VOLTAGE SYSTEM
- Ignition OFF.
- De-energize 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 AF4

AF4 CHECK THE GS1 CIRCUIT FOR A SHORT TO GROUND

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1111 Pin 32	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance above 10K ohms?

Yes

GO to AF5

No	INSTALL a new harness.

AF5 CHECK THE GS3 CIRCUIT FOR A SHORT TO GROUND

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1111 Pin 22	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance above 10K ohms?

Yes

GO to AF6

No	INSTALL a new harness.

AF6 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 S
(In step S4 continue through to step S5 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.