Pinpoint Test B : The Secondary On-Board Diagnostic Control Module (SOBDMC) (Transmission Control Module (TCM)) Does Not Respond To The Diagnostic Scan Tool

WARNING: This page is about a different car, the 2015 Lincoln MKZ. However, it is still accessible from the selected car via links, so may be relevant.

B1 CHECK THE SOBDMC (HYBRID POWERTRAIN CONTROL MODULE) VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: SOBDMC C1458A .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1458A-6	Courtesy of FORD MOTOR COMPANY	Ground
C1458A-29	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 11 volts?

Yes

GO to B2

No	VERIFY the BJB fuse 18 (10A) or 21 (15A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the OEM Electrical Wiring Diagram Introduction (Hybrid) to identify the possible causes of the circuit short.

B2 CHECK THE SOBDMC (HYBRID POWERTRAIN CONTROL MODULE) POWER RELAY VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF.

Connect a fused jumper wire:

Positive Lead	Measurement / Action	Negative Lead
C1458A-40	Courtesy of FORD MOTOR COMPANY	Ground

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1458A-9	Courtesy of FORD MOTOR COMPANY	Ground
C1458A-10	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 11 volts?

Yes	REMOVE the fused jumper wire. GO to B3

No	REMOVE the fused jumper wire. VERIFY the BJB fuse 51 (15A) is OK. If not OK, REFER to the OEM Electrical Wiring Diagram Introduction (Hybrid) to identify the possible causes of the circuit short. DIAGNOSE the TCM power relay. Refer to Engine Controls - Introduction (Hybrid) .

B3 CHECK THE SOBDMC (HYBRID POWERTRAIN CONTROL MODULE) WAKEUP CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1458A-38	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to B4

No	DIAGNOSE a SOBDMC wakeup concern at the BCM. Refer to: Body Control Module (BCM) .

B4 CHECK THE SOBDMC (HYBRID POWERTRAIN CONTROL MODULE) GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1458A-1	Courtesy of FORD MOTOR COMPANY	Ground
C1458A-2	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances less than 3 ohms?

Yes

GO to B5

No	REPAIR the circuit in question.

B5 CHECK THE HS-CAN1 (HIGH SPEED-CONTROLLER AREA NETWORK 1) CIRCUITS BETWEEN THE SOBDMC (HYBRID POWERTRAIN CONTROL MODULE) AND THE DLC (DATA LINK CONNECTOR) FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1458A-12	Courtesy of FORD MOTOR COMPANY	C251-6
C1458A-11	Courtesy of FORD MOTOR COMPANY	C251-14

Are the resistances less than 3 ohms?

Yes

GO to B6

No	REPAIR the circuit in question.

B6 CHECK FOR CORRECT SOBDMC (HYBRID POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all the SOBDMC 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 SOBDMC 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 Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new SOBDMC. Refer to Transmission Control Module (TCM) .

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.