Normal Operation and Fault Conditions

WARNING: This page is about a different car, the 2016 Ford Transit-350 HD, 2016 Ford Transit-350, 2016 Ford Transit-250, and 2016 Ford Transit-150. However, it is still accessible from the selected car via links, so may be relevant.

The SASM monitors steering wheel rotation speed, angle and direction of rotation and sends the information to the ABS module over the HS-CAN. A failure of the HS-CAN, SASM or the internal sensors causes the ABS module to set one or more DTCs.

PPT L ABS MODULE DTC FAULT TRIGGER CONDITIONS

DTC	Description	Fault Trigger Conditions
C0051:27	Steering Wheel Position Sensor: Signal Rate of Change Above Threshold	Sets when the ABS module detects the change in steering angle velocity between 2 test periods is greater than 40 degrees.
C0051:29	Steering Wheel Position Sensor: Signal Invalid	Sets when the ABS module detects the steering angle signal message does not match other ABS module inputs. This is most likely due to the steering angle sensor not being calibrated.
C0051:64	Steering Wheel Position Sensor: Signal Plausibility Failure	Sets when the ABS module detects the steering angle signal message does not match the yaw rate sensor messages sent from the RCM or the yaw rate measurement determined by wheel speed sensor differences.
C0051:82	Steering Wheel Position Sensor: Alive/Sequence Counter Incorrect/Not Updated	Sets when the ABS module detects too many or too few steering angle sensor messages.
U0428:68	Invalid Data Received from Steering Angle Sensor Module: Event Information	Sets when the ABS module detects the steering angle sensor message is "invalid" instead of the actual steering angle sensor information.

Possible Causes

Incomplete or incorrect steering angle sensor calibration
Wiring, terminals or connectors
Wheels and tires
Front suspension components
Steering system components
Incorrectly installed SASM
Incorrectly installed RCM
SASM
ABS module

Visual Inspection and Diagnostic Pre-checks

Make sure all 4 wheels and tires are in good condition and free from any defects or damage.
Make sure the front suspension components are in good condition and free from any defects or damage.
Make sure the steering system components are in good condition and free from any defects or damage.

L1: CHECK FOR SASM DTCS

Ignition ON, engine OFF.
Carry out the SASM self-test.

Are any DTCs present?

Yes	No
DIAGNOSE all SASM DTCs first. DTC Index	Go to L2.

L2: VERIFY SASM CALIBRATION

Using a diagnostic scan tool, carry out the IMU Calibration routine. Follow the diagnostic scan tool directions.
Ignition OFF.
Ignition ON, engine OFF.
Test drive the vehicle above 20 km/h (12 mph) and make at least one left and one right turn.
Carry out the ABS self-test.

Is one or more DTC shown in the ABS Module DTC Fault Trigger Conditions table present?

Yes	No
Go to L3.	The condition that caused the concern is no longer present. The concern was most likely due to an incomplete calibration or a failed calibration of the SASM. RETURN the vehicle to the customer.

L3: CHECK THE SASM PIDS

Park the vehicle with the wheels in the straight ahead position.
Access the SASM and monitor the SW_ANGLE (ANGL) PID.
Starting from the center (straight ahead) position, turn the steering wheel to the right until it stops. Record the SW_ANGLE PID display.
Starting from the center (straight ahead) position, turn the steering wheel to the left until it stops. Record the SW_ANGLE PID display.

Does the PID display at least 360 degrees after reaching each end of travel point?

Yes	No
Go to L6.	CHECK the vehicle history. VERIFY if a new clockspring or SASM has been installed. If a new clockspring has been installed, VERIFY correct clockspring installation. REFER to the Removal and Installation procedure in Supplemental Restraint System . If a new SASM has been installed, Go to L4. If a new clockspring or SASM have not been installed, Go to L10.

L4: INSPECT THE SASM INSTALLATION

Ignition OFF.
Remove the clockspring. Refer to the Removal and Installation procedure in Supplemental Restraint System .
Inspect the SASM and the SASM electrical connector for any obvious signs of damage, corrosion, foreign material or looseness.

Is the SASM and electrical connector OK?

Yes	No
Go to L5.	REPAIR or INSTALL new as necessary. REFER to the Removal and installation procedure in Steering Wheel And Column Electrical Components .

L5: VERIFY THE SASM ZERO POSITION

NOTE: The following steps set DTCs in the RCM. Makes sure to clear the DTCs before returning the vehicle to the customer.

Ignition ON, engine OFF.
Access the SASM and monitor the SW_ANGLE (ANGL) PID.
Turn the SASM rotor by hand until the SW_ANGLE PID displays 0 degrees.
Ignition OFF.
Install the clockspring. Refer to the Removal and Installation procedure in Supplemental Restraint System .
Ignition ON, engine OFF.
Clear the ABS DTCs.
Ignition OFF.
Ignition ON, engine OFF.
Test drive the vehicle above 20 km/h (12 mph) and make at least one left and one right turn.
Carry out the ABS self-test.

Is one or more of the DTCs shown in the ABS Module DTC Fault Trigger Conditions table present?

Yes	No
Go to L10.	The condition that caused the concern is no longer present. The concern was most likely due to an incorrectly installed SASM. RETURN the vehicle to the customer. CLEAR any RCM DTCs.

L6: CHECK THE ABS MODULE YAW RATE VALUE (YAW_RATE) PID

Access the ABS and monitor the YAW_RATE (ANGV) PID.

Is the YAW_RATE PID value between -0.05 and 0.05?

Yes	No
Go to L7.	Go to L9.

L7: CHECK THE ABS MODULE LATERAL ACCELERATION (LAT_ACCL) PID

Access the ABS and monitor the LAT_ACCL (ACC) PID.

the LAT_ACCL PID value between -0.4 and 0.4?

Yes	No
Go to L8.	Go to L9.

L8: CHECK THE ABS MODULE LONGITUDINAL ACCELERATION (LNG_ACCL) PID

NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement results in false values for this test.

Access the ABS and monitor the LNGACC (ACC) PID.

Is the LNG_ACCL PID value between -0.4 and 0.4?

Yes	No
Go to L10.	Go to L9.

L9: CHECK THE RCM INSTALLATION AND MOUNTING SURFACE

WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

Ignition OFF.
Wait one minute then disconnect the RCM C310A and C310B.
Inspect the RCM installation and make sure the fasteners are fully seated and tightened to specifications.
Inspect the RCM mounting surface for damage, corrosion and dirt.

Is the RCM installed correctly and is the mounting surface clean and free from damage?

Yes	No
Go to L10.	REPAIR or INSTALL new as necessary. REFER to the RCM Removal and Installation procedure in Supplemental Restraint System . After the repair, CLEAR the RCM DTCs.

L10: CHECK FOR CORRECT SASM OPERATION

Ignition OFF.
Disconnect and inspect the SASM connector (if not previously disconnected).
Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
Reconnect the SASM connector. Make sure it seats and latches correctly.
Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	No
CHECK OASIS for any applicable Technical Service Bulletins TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no TSBs address this concern, INSTALL a new SASM. REFER to Steering Wheel And Column Electrical Components .	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.