Pinpoint Test BM : U301B

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 U301B:00	Control Module Wake-up Circuit "A" Low: No Sub Type Information	This DTC sets when a wiring fault in the wake-up circuit is detected.

Possible Sources

Wiring, terminals or connectors
BECM
DCDC
ECM
ACCM

BM1 CHECK THE WAKE-UP SIGNAL CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Depower the high voltage system. REFER to: High Voltage System De-energizing .

Disconnect Inverter System Controller (ISC) C199A.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C199A-3	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10K ohms?

Yes

GO to BM2

GO to BM4

BM2 CHECK THE WAKE-UP SIGNAL CIRCUIT FOR AN OPEN

Disconnect High Voltage Battery C3733 HEV or C3732 PHEV.

Disconnect DCDC C1457B.

Disconnect ECM C1381B.

Disconnect SOBDM (PHEV only) C3471A.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C199A-3	Courtesy of FORD MOTOR COMPANY	C3733-1 HEV
C199A-3	Courtesy of FORD MOTOR COMPANY	C3732-1 PHEV
C199A-3	Courtesy of FORD MOTOR COMPANY	C1457B-5
C199A-3	Courtesy of FORD MOTOR COMPANY	C1381B-21
C199A-3	Courtesy of FORD MOTOR COMPANY	C3471A-C2 PHEV only

Is the resistance less than 5 ohms?

Yes

GO to BM3

No	With the aid of the wiring diagram, REPAIR the open circuit.

BM3 CHECK FOR CORRECT INVERTER SYSTEM CONTROLLER (ISC) OPERATION

Reconnect all previously disconnected connectors. Make sure they seat and latch correctly.

Repower the high voltage system. REFER to: High Voltage System De-energizing .

Ignition ON.

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

Is the concern still present?

Yes

GO to BM4

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. CLEAR the DTCs and REPEAT the self-test.

BM4 CHECK THE WAKE-UP SIGNAL CIRCUIT FOR A SHORT TO GROUND WITH THE BECM (BATTERY ENERGY CONTROL MODULE) DISCONNECTED

Ignition OFF.

Depower the high voltage system. REFER to: High Voltage System De-energizing .

Disconnect Inverter System Controller (ISC) C199A.

Disconnect High Voltage Battery C3733 HEV or C3732 PHEV.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C199A-3	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10K ohms?

Yes

GO to BM5

GO to BM6

BM5 CHECK FOR CORRECT BECM (BATTERY ENERGY CONTROL MODULE) OPERATION

Disconnect and inspect all BECM 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 BECM connectors. Make sure they seat and latch correctly.

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, INSTALL a new BECM. REFER to: Battery Energy Control Module (BECM) - Hybrid Electric Vehicle (HEV) .

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.

BM6 CHECK THE WAKE-UP SIGNAL CIRCUIT FOR A SHORT TO GROUND WITH THE DCDC (DIRECT CURRENT/DIRECT CURRENT CONVERTER CONTROL MODULE) DISCONNECTED

Disconnect DCDC C1457B.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C199A-3	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10K ohms?

Yes

GO to BM7

GO to BM8

BM7 CHECK FOR CORRECT DCDC (DIRECT CURRENT/DIRECT CURRENT CONVERTER CONTROL MODULE) OPERATION

Disconnect and inspect all DCDC 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 DCDC connectors. Make sure they seat and latch correctly.

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, INSTALL a new DCDC. REFER to: Direct Current/Direct Current (DC/DC) Converter Control Module .

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.

BM8 CHECK THE WAKE-UP SIGNAL CIRCUIT FOR A SHORT TO GROUND WITH THE ECM (ENGINE CONTROL MODULE) DISCONNECTED

Disconnect ECM C1381B.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C199A-3	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10K ohms?

Yes	GO to BM10

GO to BM9

BM9 CHECK FOR CORRECT ECM (ENGINE CONTROL MODULE) OPERATION

Disconnect and inspect all ECM 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 ECM connectors. Make sure they seat and latch correctly.

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, INSTALL a new ECM. REFER to: Powertrain Control Module (PCM) .

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.

BM10 CHECK THE WAKE-UP SIGNAL CIRCUIT FOR A SHORT TO GROUND WITH THE SOBDM (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE A) BATTERY CHARGER CONTROL MODULE (BCCM) DISCONNECTED

Disconnect SOBDM Battery Charger Control Module (BCCM) C3471A.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C199A-3	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10K ohms?

Yes	GO to BM11

No	REPAIR the circuit.

BM11 CHECK FOR CORRECT SOBDM (SECONDARY ON-BOARD DIAGNOSTIC CONTROL MODULE A) BATTERY CHARGER CONTROL MODULE (BCCM) OPERATION

Disconnect and inspect all SOBDM Battery Charger Control Module (BCCM) 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 SOBDM Battery Charger Control Module (BCCM) connectors. Make sure they seat and latch correctly.

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, INSTALL a new SOBDM Battery Charger Control Module (BCCM). REFER to: Secondary On-Board Diagnostic Control Module A (SOBDM) - Plug-In Hybrid Electric Vehicle (PHEV) .

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.