Pinpoint Test G : The TCCM (Transfer Case Control Module) Does Not Respond To The Diagnostic Scan Tool

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

G1 CHECK THE TCCM (TRANSFER CASE CONTROL MODULE) VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect: TCCM C2371A and C2371B .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2371A-7	Courtesy of FORD MOTOR COMPANY	Ground

Positive Lead	Measurement / Action	Negative Lead
C2371B-6	Courtesy of FORD MOTOR COMPANY	Ground
C2371B-7	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to G2

No	VERIFY BJB fuse 13 (10A), 63 (25A) or 71 (25A) is OK. If OK, REPAIR the circuit. If not OK, Refer to the Wiring Diagram Information to identify the possible causes of the circuit short.

G2 CHECK THE TCCM (TRANSFER CASE CONTROL MODULE) GROUND CIRCUITS FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2371B-1	Courtesy of FORD MOTOR COMPANY	Ground
C2371B-3	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to G3

No	REPAIR the circuit.

G3 CHECK THE HS-CAN2 (HIGH-SPEED CONTROLLER AREA NETWORK 2) CIRCUITS BETWEEN THE TCCM (TRANSFER CASE CONTROL MODULE) AND THE DLC (DATA LINK CONNECTOR) FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2371A-10	Courtesy of FORD MOTOR COMPANY	C251-3
C2371A-9	Courtesy of FORD MOTOR COMPANY	C251-11

Are the resistances less than 3 ohms?

Yes

GO to G4

No	REPAIR the circuit in question.

G4 CHECK FOR CORRECT TCCM (TRANSFER CASE CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect the TCCM 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 TCCM 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, General Service Bulletin (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 TCCM. REFER to: Transfer Case Control Module (TCCM) .

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.