Pinpoint Test O : The PSCM (Power Steering Control Module) Does Not Respond To The Diagnostic Scan Tool

WARNING: This page is about a different car, the 2020 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

Refer to Module Communications Network for schematic and connector information. Refer to Power Steering Controls for schematic and connector information.
Normal Operation and Fault Conditions

The PSCM communicates on the HS-CAN2.

Possible Sources
- Fuse
- Wiring, terminals and connector
- PSCM
Visual Inspection and Pre-checks
- Verify BJB MEGA fuse (125A) and BJB fuse 64 (5A) are OK.

O1 CHECK THE PSCM (POWER STEERING CONTROL MODULE) VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect: PSCM C1463A and C1463B.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1463A-1	Courtesy of FORD MOTOR COMPANY	Ground

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1463B-2	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 11 volts?

Yes

GO to O2

No	VERIFY BJB MEGA fuse (125A) and BJB fuse 64 (5A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the Introduction to identify the possible causes of the circuit short.

O2 CHECK THE PSCM (POWER STEERING CONTROL MODULE) GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1463B-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to O3

No	REPAIR the circuit.

O3 CHECK THE HS-CAN2 (HIGH-SPEED CONTROLLER AREA NETWORK 2) CIRCUITS BETWEEN THE PSCM (POWER STEERING CONTROL MODULE) AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1463A-2	Courtesy of FORD MOTOR COMPANY	C2431-18
C1463A-3	Courtesy of FORD MOTOR COMPANY	C2431-17

Are the resistances less than 3 ohms?

Yes

GO to O4

No	REPAIR the circuit in question.

O4 CHECK FOR CORRECT PSCM (POWER STEERING CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all the PSCM 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 PSCM 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, REFER to the EPAS Symptom Chart. Refer to EPAS Guided Routine .

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.