Diagnostic Routine AF
Diagnostic Routine AF
Diagnostic Overview
Steering Angle Sensor Module (SASM) Signal Failure DTCs
The SASM (Steering Angle Sensor Module) monitors steering wheel rotation speed, angle and direction of rotation and sends the information to the ABS (Anti-Lock Brake System) module over the HS-CAN (High Speed Controller Area Network). A failure of the HS-CAN (High Speed Controller Area Network), SASM (Steering Angle Sensor Module) or the internal sensors causes the ABS (Anti-Lock Brake System) to set one or more DTCs (Diagnostic Trouble Codes).
DTC Fault Trigger Conditions
Pinpoint Test
1. CHECK FOR ABS (Anti-Lock Brake System) MODULE DTCs (Diagnostic Trouble Codes)
1. Ignition ON.
2. Using a scan tool, carry out the ABS (Anti-Lock Brake System) module self-test.
3. Retrieve and record all ABS (Anti-Lock Brake System) module DTCs (Diagnostic Trouble Codes).
Is DTC (Diagnostic Trouble Code) C0051:28 present?
2. VERIFY SASM (Steering Angle Sensor Module) CALIBRATION
1. Using a scan tool, carry out the IVD Initialization procedure. Follow the scan tool directions.
2. Ignition OFF.
3. Ignition ON.
4. Test drive the vehicle above 20 km/h (12.4 mph) and make at least 1 left turn and 1 right turn.
5. Using a scan tool, carry out the ABS (Anti-Lock Brake System) module self-test.
Is DTC (Diagnostic Trouble Code) C0051:28 present?
3. CHECK THE SASM (Steering Angle Sensor Module) PIDs (Parameter Identifications)
1. Park the vehicle with the wheels in the straight ahead position.
2. Using a scan tool, monitor the SASM (Steering Angle Sensor Module) steering wheel angle (SW_ANGLE) PID (Parameter Identification).
3. Starting from the center (straight ahead) position, turn the steering wheel to the right until it stops. Record the SW_ANGLE PID (Parameter Identification) display.
4. Starting from the center (straight ahead) position, turn the steering wheel to the left until it stops. Record the SW_ANGLE PID (Parameter Identification) display.
Does the PID (Parameter Identification) display at least 380° after reaching each end of travel point?
4. INSPECT THE SASM (Steering Angle Sensor Module) INSTALLATION
1. Ignition OFF.
2. Remove the clockspring. REFER to Clockspring .
3. Inspect the SASM (Steering Angle Sensor Module) and the SASM (Steering Angle Sensor Module) electrical connector for any obvious signs of damage, corrosion, foreign material or looseness.
Are the SASM (Steering Angle Sensor Module) and electrical connector OK?
5. VERIFY THE SASM (Steering Angle Sensor Module) ZERO POSITION
1. NOTE: This step sets DTCs (Diagnostic Trouble Codes) in multiple modules. Clear these DTCs (Diagnostic Trouble Codes) after the repair has been completed.
Ignition ON.
2. Using a scan tool, monitor the SASM (Steering Angle Sensor Module) steering wheel angle (SW_ANGLE) PID (Parameter Identification).
3. Turn the SASM (Steering Angle Sensor Module) rotor by hand until the SW_ANGLE displays 0°.
4. Ignition OFF.
5. Install the clockspring. REFER to Clockspring .
6. Ignition ON.
7. Using a scan tool, clearall CMDTCs (Continuous Memory Diagnostic Trouble Codes).
8. Ignition OFF.
9. Ignition ON.
10. Using a scan tool, carry out the ABS (Anti-Lock Brake System) module self-test.
Are DTCs (Diagnostic Trouble Codes) U0428:00, 61, 68, 2F; U0428:62 or 64 present?
6. CHECK THE ABS (Anti-Lock Brake System) MODULE YAW RATE VALUE (YAW_RATE) PID (Parameter Identification)
1. NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement results in false values for this test.
Monitor the YAW_RATE PID (Parameter Identification).
Is the YAW_RATE PID (Parameter Identification) value between -0.05 and 0.05?
7. CHECK THE ABS (Anti-Lock Brake System) MODULE LATERAL ACCELERATION (LAT_ACCL) PID (Parameter Identification)
1. NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement results in false values for this test.
Monitor the LAT_ACCL PID (Parameter Identification).
Is the LAT_ACCL PID (Parameter Identification) value between -0.4 and 0.4?
8. CHECK THE ABS (Anti-Lock Brake System) MODULE LONGITUDINAL ACCELERATION (LNGACC) PID (Parameter Identification)
1. NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement results in false values for this test.
2. Monitor the LNGACC PID (Parameter Identification).
Is the LNGACC PID (Parameter Identification) value between -0.4 and 0.4?
9. CHECK THE RCM (Restraints Control Module) INSTALLATION AND MOUNTING SURFACE
1. Ignition OFF.
2. Depower the SRS (Supplemental Restraint System). REFER to Supplemental Restraint System (SRS) Depowering and Repowering - with Intelligent Access (IA) or Supplemental Restraint System (SRS) Depowering and Repowering - without Intelligent Access (IA) . Service and Repair
3. Inspect the RCM (Restraints Control Module) installation and make sure that the fasteners are fully seated and tightened correctly. REFER to Restraints Control Module (RCM). Service and Repair
4. Inspect the RCM (Restraints Control Module) mounting surface for damage, corrosion or dirt.
Is the RCM (Restraints Control Module) installed correctly and is the mounting surface clean and free from damage?
10. CHECK FOR CORRECT SASM (Steering Angle Sensor Module) OPERATION
1. Ignition OFF.
2. Disconnect and inspect the SASM (Steering Angle Sensor Module) electrical connector (if not previously disconnected).
3. Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
4. Connect the SASM (Steering Angle Sensor Module) electrical connector. Make sure it seats and latches correctly.
5. Connect all RCM (Restraints Control Module) electrical connectors. Make sure they seat and latch correctly.
6. Repower the SRS (Supplemental Restraint System). REFER to Supplemental Restraint System (SRS) Depowering and Repowering - with Intelligent Access (IA) or Supplemental Restraint System (SRS) Depowering and Repowering - without Intelligent Access (IA) . Service and Repair
7. Operate the system and determine if the concern is still present.
Is the concern still present?
