Pinpoint Test M : SASM (Steering Angle Sensor Module) Signal Faults: Notes
WARNING: This page is about a different car, the 2015 Ford C-Max. However, it is still accessible from the selected car via links, so may be relevant.
Refer to VEHICLE DYNAMIC SYSTEMS for schematic and connector information.
Normal Operation and Fault Conditions
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 to set one or more Diagnostic Trouble Codes (DTCs). The SASM is also known as the steering wheel position sensor.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| C0051:28 | Steering Wheel Position Sensor: Signal Bias Level Out of Range / Zero Adjustment Failure | This DTC sets in continuous memory and on-demand if the absolute value of the measured steering wheel position is greater than 720 degrees or if the calculated steering angle offset is greater than 15 degrees. This is most likely caused by loose or worn steering or suspension components that result in a vehicle tracking, pull or drift issue. Also, an incorrectly installed SASM or clockspring may cause the steering angle to be offset. |
| C0051:54 | Steering Wheel Position Sensor: Missing Calibration | This DTC sets in continuous memory and on-demand if the steering angle status message "Not Initialized" is received by the ABS module for longer than 800 ms with vehicle speed above 15 km/h (9 mph). This is most likely caused by a new SASM that has not been calibrated, an undervoltage at the module or an internal failure of the module. |
| C0051:62 | Steering Wheel Position Sensor: Signal Compare Failure | This DTC sets in continuous memory and on-demand if the difference between the steering wheel angle signal and the calculated reference signal is too high. This is most likely caused by a vehicle alignment concern or an incorrectly mounted SASM. |
| C0051:64 | Steering Wheel Position Sensor: Signal Plausibility Failure | This DTC sets in continuous memory and on-demand if the difference between the steering wheel angle signal and the calculated reference signal is too high or if the steering wheel angle sensor does not match other stability control sensor inputs. This is most likely caused by a vehicle alignment concern, an incorrectly mounted angle sensor or an internal failure of the SASM. |
| C0051:85 | Steering Wheel Position Sensor: Signal Above Allowable Range | This DTC sets in continuous memory and on-demand if the absolute value of the calculated steering wheel angle is greater than a predetermined threshold. This is most likely caused by an incorrectly installed SASM, vehicle alignment concerns or an internal failure of the SASM. |
| C0051:96 | Steering Wheel Position Sensor: Component Internal Failure | This DTC sets in continuous memory and on-demand if the steering angle status message "Defective" is received by the ABS module or the status message changes from "Normal Operation" to "Not Initialized". This is most likely caused by an interruption of the voltage supply to the angle sensor, the loss of initialization by the angle sensor or an internal fault of the SASM. |
Possible Sources
- Incomplete or incorrect SASM calibration
- Wheels and tires
- Front suspension components
- Steering system components
- Incorrectly installed SASM
- Incorrectly installed clockspring
- Incorrectly installed RCM
- SASM