Pinpoint Test BZ : P0A2B, P0A2C, P0A2D

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 P0A2B:64	Drive Motor "A" Temperature Sensor "A" Circuit Range/Performance: Signal Plausibility Failure	This DTC sets when the motor coil temperature sensor reading does not correlate with the generator coil temperature sensor and TFT sensor readings.
SOBDMC P0A2C:00	Drive Motor "A" Temperature Sensor "A" Circuit Low: No Sub Type Information	This DTC sets when a short to ground is detected in the motor coil temperature circuit.
SOBDMC P0A2D:00	Drive Motor "A" Temperature Sensor "A" Circuit High: No Sub Type Information	This DTC sets when an open circuit is detected in the motor coil temperature circuit.

Possible Sources

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

BZ1 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) CALIBRATION LEVEL

NOTE: DTC P0A2B can set due to external aftermarket engine block heater. In such cases the P0A2B can be ignored.
- 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 BZ2

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

BZ2 CHECK FOR APPLICABLE SERVICE ARTICLES
- Check OASIS for any applicable service articles: TSB, GSB, SSM or FSA.
Are any service articles applicable to the concern?

Yes DISCONTINUE this test and FOLLOW the service article instructions.

No GO to BZ3

BZ3 CHECK THE AUTOMATIC TRANSMISSION FLUID LEVEL

NOTE: A low automatic transmission fluid level may cause a traction motor over temperature condition.
- Verify the automatic transmission fluid level and condition is correct. REFER to: Transmission Fluid Level Check .
Is the transmission fluid level and condition correct?

Yes GO to BZ7

No DIAGNOSE the transmission cooling concern. REFER to: Automatic Transmission .

BZ4 CHECK THE AUTOMATIC TRANSMISSION PARAMETER IDENTIFICATIONS (PIDS)

NOTE: A low automatic transmission fluid level may cause a traction motor over temperature condition.
- Cold soak the vehicle at ambient temperature for at least 4 hours.
- Access the SOBDMC and monitor the TFT (°C) PID
- Access the SOBDMC and monitor the MCL TEMP (°C) PID
Are the PIDs within 15°C (27°F) of each other?

Yes GO to BZ5

No GO to BZ7

BZ5 INTERMITTENT CHECK
- Access the SOBDMC and monitor the TFT (°C) PID
- Access the SOBDMC and monitor the MCL TEMP (°C) PID
- While observing the PIDs carry out the following:
  - Lightly tap on the transmission assembly connector and wiggle the accessible harness from the transmission assembly to the Inverter System Controller (ISC)
  - Wiggle the transmission assembly connector
  - Look for sudden changes in temperature when the harness and connectors are wiggled
Are any concerns present?

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

No GO to BZ6

BZ6 VISUAL INSPECTION OF THE INVERTER SYSTEM CONTROLLER (ISC) CONNECTORS

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
- water intrusion - install new connector

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

Test drive and bring the vehicle to operating temperature.

CLEAR the Inverter System Controller (ISC) DTCs.

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

Is DTC P0A2B, P0A2C or P0A2D present?

Yes

GO to BZ7

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.

BZ7 CHECK THE MOTOR TEMPERATURE SENSOR CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect HF45 Transmission C1111.

Disconnect Inverter System Controller (ISC) C199B.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C199B-11	Courtesy of FORD MOTOR COMPANY	C1111-35
C199B-10	Courtesy of FORD MOTOR COMPANY	C1111-25

Is the resistance less than 3 ohms?

Yes

GO to BZ8

No	With the aid of the wiring diagram, REPAIR the open circuit. CLEAR the Inverter System Controller (ISC) DTCs. REPEAT the self-test.

BZ8 CHECK THE MOTOR TEMPERATURE CIRCUITS FOR A SHORT TOGETHER

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1111-35	Courtesy of FORD MOTOR COMPANY	C1111-1 all pins except pin 25

Is the resistance greater than 10K ohms?

Yes

GO to BZ9

No	With the aid of the wiring diagram, REPAIR the short circuit. CLEAR the Inverter System Controller (ISC) DTCs. REPEAT the self-test

BZ9 CHECK THE MOTOR TEMPERATURE SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1111-35	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	With the aid of the wiring diagram, REPAIR the short circuit. CLEAR the Inverter System Controller (ISC) DTCs. REPEAT the self-test

No	GO to BZ10

BZ10 CHECK THE MOTOR TEMPERATURE RETURN CIRCUIT FOR A SHORT TO VOLTAGE

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1111-25	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	With the aid of the wiring diagram, REPAIR the short circuit. CLEAR the Inverter System Controller (ISC) DTCs. REPEAT the self-test

No	GO to BZ11

BZ11 CHECK THE MOTOR TEMPERATURE SIGNAL CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1111-35	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10K ohms?

Yes	GO to BZ12

No	With the aid of the wiring diagram, REPAIR the short circuit. CLEAR the Inverter System Controller (ISC) DTCs. REPEAT the self-test

BZ12 CHECK THE MOTOR TEMPERATURE RETURN CIRCUIT FOR A SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1111-25	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10K ohms?

Yes	GO to BZ13

No	With the aid of the wiring diagram, REPAIR the short circuit. CLEAR the Inverter System Controller (ISC) DTCs. REPEAT the self-test

BZ13 CHECK THE MOTOR TEMPERATURE SENSOR RESISTANCE

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
Courtesy of FORD MOTOR COMPANY C1111 pin 25, component side	Courtesy of FORD MOTOR COMPANY	Courtesy of FORD MOTOR COMPANY C1111 pin 35, component side

Record the measurement result and compare with the expected temperature values below:
- -40°F (-40°C) 1695.776 K ohms - 2302.415 K ohms
- -31°F (-35°C) 1194.043 K ohms - 1598.148 K ohms
- -22°F (-30°C) 852.9844 K ohms - 1126.096 K ohms
- -13°F (-25°C) 617.6642 K ohms - 804.7572 K ohms
- -4°F (-20°C) 453.0069 K ohms - 582.8025 K ohms
- 5°F (-15°C) 336.2607 K ohms - 427.3758 K ohms
- 14°F (-10°C) 252.446 K ohms - 317.117 K ohms
- 23°F (-5°C) 191.5609 K ohms - 237.9395 K ohms
- 32°F (deg.C) 146.8371 K ohms - 180.419 K ohms
- 41°F (5°C) 113.637 K ohms - 138.172 K ohms
- 50°F (10°C) 88.743 K ohms - 106.82 K ohms
- 59°F (15°C) 69.9003 K ohms - 83.3236 K ohms
- 68°F (20°C) 55.5087 K ohms - 65.5487 K ohms
- 77°F (25°C) 44.4225 K ohms - 51.9824 K ohms
- 86°F (30°C) 35.8128 K ohms - 41.5406 K ohms
- 95°F (35°C) 29.0745 K ohms - 33.4388 K ohms
- 104°F (40°C) 23.7617 K ohms - 27.1044 K ohms

Is the resistance within specification?

Yes	GO to BZ14

No	INSTALL a new transmission. REFER to: Transmission . CLEAR the Inverter System Controller (ISC) DTCs. REPEAT the self-test.

BZ14 CHECK THE MOTOR TEMPERATURE SENSORS FOR A SHORT TO GROUND

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
Courtesy of FORD MOTOR COMPANY C1111 pin 25, component side	Courtesy of FORD MOTOR COMPANY	Ground
Courtesy of FORD MOTOR COMPANY C1111 pin 35, component side	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10K ohms?

Yes	GO to BZ15

No	INSTALL a new transmission. REFER to: Transmission . CLEAR the Inverter System Controller (ISC) DTCs. REPEAT the self-test.

BZ15 VISUAL INSPECTION OF THE INVERTER SYSTEM CONTROLLER (ISC) CONNECTORS

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
- water intrusion - install new connector

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

Ignition ON.

CLEAR the Inverter System Controller (ISC) DTCs.

Carefully wiggle all accessible wiring and connectors associated with the Inverter System Controller (ISC).

Test drive and bring the vehicle to operating temperature.

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

Is DTC P0A2B, P0A2C or P0A2D 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, INSTALL a new low voltage harness between the Inverter System Controller (ISC) and the transmission. CLEAR the Inverter System Controller (ISC) DTCs and repeat the self-test.

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.