Pinpoint Test Z : The GFM2 (Generic Function Module 2) Does Not Respond To The Scan Tool

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

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings.

Z1 CHECK THE GFM2 (GENERIC FUNCTION MODULE 2) VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: GFM2 C3719 .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3719-1	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 11 volts?

Yes

GO to Z2

No	VERIFY RJB fuse 39 (15A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION (EXCEPT ELECTRIC) to identify the possible causes of the circuit short.

Z2 CHECK THE GFM2 (GENERIC FUNCTION MODULE 2) GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3719-13	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances less than 3 ohms?

Yes

GO to Z3

No	REPAIR the circuit in question.

Z3 CHECK THE HS-CAN (HIGH-SPEED CONTROLLER AREA NETWORK) CIRCUITS BETWEEN THE GFM2 (GENERIC FUNCTION MODULE 2) AND THE DLC (DATA LINK CONNECTOR) FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3719-23	Courtesy of FORD MOTOR COMPANY	C251-6
C3719-24	Courtesy of FORD MOTOR COMPANY	C251-14

Are the resistances less than 3 ohms?

Yes

GO to Z4

No	REPAIR the circuit in question.

Z4 CHECK FOR CORRECT GFM2 (GENERIC FUNCTION MODULE 2) OPERATION

Ignition OFF.

Disconnect and inspect all the GFM2 connectors and related in-line 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 GFM2 connectors and related in-line 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 GFM2.

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.