Pinpoint Test Ah : The Gateway Module (GWM) Does Not Respond To The Diagnostic Scan Tool
WARNING: This page is about a different car, the 2018 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.
- AH1 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.
Is the resistance between 54 and 66 ohms?
Yes GO to AH3 No GO to AH2 - AH2 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) C251-6 C2431-19 (component side) C251-14
Are the resistances less than 3 ohms?
Yes GO to AH3 No GO to AH9 - AH3 CHECK THE HS-CAN2 (HIGH SPEED-CONTROLLER AREA NETWORK 2) TERMINATION RESISTANCE
- Connect: GWM C2431 .
Is the resistance between 54 and 66 ohms?
Yes GO to AH5 No GO to AH4 - AH4 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) C251-3 C2431-17 (component side) C251-11
Are the resistances less than 3 ohms?
Yes GO to AH5 No GO to AH9 - AH5 CHECK THE MS-CAN (MEDIUM SPEED-CONTROLLER AREA NETWORK) TERMINATION RESISTANCE, COMPONENT SIDE
- Measure:
Positive Lead Measurement / Action Negative Lead C2431-23 (component side) C2431-22 (component side)
Is the resistance between 108 and 132 ohms?
Yes GO to AH6 No GO to AH9 - Measure:
- AH6 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) C2431-15 (component side)
Is the resistance between 108 and 132 ohms?
Yes GO to AH7 No GO to AH9 - Measure:
- AH7 CHECK THE GWM (GATEWAY MODULE A) VOLTAGE SUPPLY CIRCUITS FOR AN OPEN
- Connect negative battery cable.
Is the voltage greater than 11 volts?
Yes GO to AH8 No VERIFY the BCM fuse 13 (7.5A) or fuse 15 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short. - AH8 CHECK THE GWM (GATEWAY MODULE A) GROUND CIRCUITS FOR AN OPEN
- Ignition OFF.
Are the resistances less than 3 ohms?
Yes GO to AH9 No REPAIR the circuit in question. - AH9 CHECK FOR CORRECT GWM (GATEWAY MODULE A) OPERATION
- Ignition OFF.
- Disconnect and inspect all GWM 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 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.