Pinpoint Test AK : The Gateway Module (GWM) Does Not Respond To The Diagnostic Scan Tool

WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

AK1 CHECK THE HS-CAN1 (HIGH SPEED-CONTROLLER AREA NETWORK 1) TERMINATION RESISTANCE

Ignition OFF.

Disconnect negative battery cable.

Disconnect the diagnostic scan tool cable from the DLC.

Measure:

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

Is the resistance between 54 and 66 ohms?

Yes

GO to AK3

GO to AK2

AK2 CHECK THE HS-CAN1 (HIGH SPEED-CONTROLLER AREA NETWORK 1) CIRCUITS BETWEEN THE GWM (GATEWAY MODULE A) AND THE DLC (DATA LINK CONNECTOR) FOR AN OPEN

Disconnect GWM C2431 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2431-20 (component side)	Courtesy of FORD MOTOR COMPANY	C251-6
C2431-19 (component side)	Courtesy of FORD MOTOR COMPANY	C251-14

Are the resistances less than 3 ohms?

Yes

GO to AK3

No	GO to AK13

AK3 CHECK THE HS-CAN2 (HIGH SPEED-CONTROLLER AREA NETWORK 2) TERMINATION RESISTANCE

Connect: GWM C2431 .

Measure:

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

Is the resistance between 54 and 66 ohms?

Yes

GO to AK5

GO to AK4

AK4 CHECK THE HS-CAN2 (HIGH SPEED-CONTROLLER AREA NETWORK 2) CIRCUITS BETWEEN THE GWM (GATEWAY MODULE A) AND THE DLC (DATA LINK CONNECTOR) FOR AN OPEN

Disconnect: GWM C2431 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2431-18 (component side)	Courtesy of FORD MOTOR COMPANY	C251-3
C2431-17 (component side)	Courtesy of FORD MOTOR COMPANY	C251-11

Are the resistances less than 3 ohms?

Yes

GO to AK5

No	GO to AK13

AK5 CHECK THE MS-CAN (MEDIUM SPEED-CONTROLLER AREA NETWORK) TERMINATION RESISTANCE

Disconnect: GWM C2431 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2431-23	Courtesy of FORD MOTOR COMPANY	C2431-22

Is the resistance between 108 and 132 ohms?

Yes

GO to AK6

No	GO to Pinpoint Test K

AK6 CHECK THE MS-CAN (MEDIUM SPEED-CONTROLLER AREA NETWORK) TERMINATION RESISTANCE, COMPONENT SIDE

Disconnect: GWM C2431 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2431-23 (component side)	Courtesy of FORD MOTOR COMPANY	C2431-22 (component side)

Is the resistance between 108 and 132 ohms?

Yes

GO to AK7

No	GO to AK13

AK7 CHECK THE HS-CAN3 (HIGH SPEED-CONTROLLER AREA NETWORK 3) TERMINATION RESISTANCE

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2431-16	Courtesy of FORD MOTOR COMPANY	C2431-15

Is the resistance between 108 and 132 ohms?

Yes

GO to AK8

No	GO to Pinpoint Test H

AK8 CHECK THE HS-CAN3 (HIGH SPEED-CONTROLLER AREA NETWORK 3) TERMINATION RESISTANCE, COMPONENT SIDE

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2431-16 (component side)	Courtesy of FORD MOTOR COMPANY	C2431-15 (component side)

Is the resistance between 108 and 132 ohms?

Yes	If equipped with trailer tow package, GO to AK9. If not equipped with trailer tow package, GO to AK11

No	GO to AK13

AK9 CHECK THE MEDIUM SPEED CONTROLLER AREA NETWORK 2 (MS-CAN2) TERMINATION RESISTANCE

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2431-21	Courtesy of FORD MOTOR COMPANY	C2431-9

Is the resistance between 108 and 132 ohms?

Yes	GO to AK10

No	GO to Pinpoint Test AI

AK10 CHECK THE MEDIUM SPEED CONTROLLER AREA NETWORK 2 (MS-CAN2) TERMINATION RESISTANCE, COMPONENT SIDE

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2431-21 (component side)	Courtesy of FORD MOTOR COMPANY	C2431-9 (component side)

Is the resistance between 108 and 132 ohms?

Yes	GO to AK11

No	GO to AK13

AK11 CHECK THE GWM (GATEWAY MODULE A) VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

Connect negative battery cable.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2431-13	Courtesy of FORD MOTOR COMPANY	Ground
C2431-24	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes	GO to AK12

No	VERIFY the BCM fuse 13 (7.5A) or fuse 15 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM Wiring Diagrams to identify the possible causes of the circuit short.

AK12 CHECK THE GWM (GATEWAY MODULE A) GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2431-1	Courtesy of FORD MOTOR COMPANY	Ground
C2431-14	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances less than 3 ohms?

Yes	GO to AK13

No	REPAIR the circuit in question.

AK13 CHECK FOR CORRECT GWM (GATEWAY MODULE A) OPERATION

Ignition OFF.

Disconnect and inspect the GWM connector 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 GWM connector 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 GWM. Refer to: Gateway Module A (GWM) .

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.