Pinpoint Test M: SASM (Steering Angle Sensor Module) Signal Failure Faults

• Ignition ON.
• Using a diagnostic scan tool, carry out the SASM  self-test.

Are there any Diagnostic Trouble Codes (DTCs) present in the SASM ? 

1. Yes  : DIAGNOSE all SASM  Diagnostic Trouble Codes (DTCs) before diagnosing any ABS  C0051:xx codes. GO to the DTC CHART: SASM .

   REFER to: ANTI-LOCK BRAKE SYSTEM (ABS) AND STABILITY CONTROL - VEHICLES BUILT UP TO: 11-JULY-2013  .

2. No  : GO to M2 

• Using a diagnostic scan tool, carry out the ABS  module self-test.
• Retrieve and record all ABS  module Diagnostic Trouble Codes (DTCs).

Is DTC U0126:00 present? 

1. Yes  : DIAGNOSE DTC  U0126:00 before diagnosing any C0051:xx codes. GO to PINPOINT TEST K 
2. No  : For all C0051:xx codes, GO to M3 

   For all other ABS  module Diagnostic Trouble Codes (DTCs), GO to the DTC CHART: ABS MODULE .

   REFER to: ANTI-LOCK BRAKE SYSTEM (ABS) AND STABILITY CONTROL - VEHICLES BUILT UP TO: 11-JULY-2013  .

• Using a diagnostic scan tool, carry out the Multi-Calibration routine. Follow the scan tool directions.
• Ignition OFF.
• Ignition ON.
• Test drive the vehicle above and make at least 1 left turn and 1 right turn.
• Using a diagnostic scan tool, carry out the ABS  module self-test.

Are any C0051:xx Diagnostic Trouble Codes (DTCs) present? 

1. Yes  : GO to M4 
2. No  : 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  .

• Park the vehicle with the wheels in the straight ahead position.
• Using a diagnostic scan tool, monitor the SASM  SW_ANGLE 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? 

1. Yes  : GO to  M7
2. No  : CHECK the vehicle history and VERIFY if a new clockspring or SASM  has been installed.

   If a new SASM  has been installed, GO to M5 

   If a new clockspring has been installed, VERIFY correct clockspring installation.

   REFER to: CLOCKSPRING .

   If a new clockspring or SASM  have not been installed, INSTALL a new SASM  .

   REFER to: STEERING ANGLE SENSOR MODULE (SASM) .

• Ignition OFF.
• Remove the clockspring.

  REFER to: CLOCKSPRING .

• Inspect the SASM  and the SASM  electrical connector for any obvious signs of damage, corrosion, foreign material or looseness.

Are the SASM and electrical connector OK? 

1. Yes  : GO to M6 
2. No  : REPAIR or INSTALL new as necessary.

   REFER to: STEERING ANGLE SENSOR MODULE (SASM) .

• Ignition ON.
• Using a diagnostic scan tool, monitor the SASM  steering wheel angle (SW_ANGLE) PID  .
• Turn the SASM  rotor by hand until the SW_ANGLE displays 0 degrees.
• Ignition OFF.
• Install the clockspring.

  REFER to: CLOCKSPRING .

• Ignition ON.
• Using a diagnostic scan tool, clear all Continuous Memory Diagnostic Trouble Codes (CMDTCs).
• Ignition OFF.
• Ignition ON.
• Using a diagnostic scan tool, carry out the ABS  module self-test.

Are any C0051:xx Diagnostic Trouble Codes (DTCs) present? 

1. Yes  : GO to M7 
2. No  : 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.

   For all other ABS  module Diagnostic Trouble Codes (DTCs), GO to the DTC CHART: ABS MODULE .

   REFER to: ANTI-LOCK BRAKE SYSTEM (ABS) AND STABILITY CONTROL - VEHICLES BUILT UP TO: 11-JULY-2013  .

• Ignition ON.
• Using a diagnostic scan tool, monitor the ABS  module YAW_RATE PID  .

Is the YAW_RATE PID value between -0.05 and 0.05? 

1. Yes  : GO to M8 
2. No  : GO to  M10

• Using a diagnostic scan tool, monitor the ABS  module LAT_ACCL PID  .

Is the LAT_ACCL PID value between -0.4 and 0.4? 

1. Yes  : GO to M9 
2. No  : GO to  M10

• NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement results in false values for this test.
• Using a diagnostic scan tool, monitor the ABS  module LNGACC PID  .

Is the LNGACC PID value between -0.4 and 0.4? 

1. Yes  : GO to  M11
2. No  : GO to M10 

• Ignition OFF.
• Depower the Supplemental Restraint System (SRS).

  REFER to: SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .

• Inspect the RCM  installation and make sure that the fasteners are fully seated and tightened correctly.

  REFER to: RESTRAINTS CONTROL MODULE (RCM) .

• Inspect the RCM  mounting surface for damage, corrosion or dirt.

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

1. Yes  : GO to M11 
2. No  : REPAIR or INSTALL new as necessary.

   REFER to: RESTRAINTS CONTROL MODULE (RCM) .

• Ignition OFF.
• Disconnect and inspect the SASM  electrical 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
• Connect the SASM  electrical connector. Make sure it seats and latches correctly.
• Connect all RCM  electrical connectors. Make sure they seat and latch correctly.
• Repower the Supplemental Restraint System (SRS).

  REFER to: SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .

• Operate the system and determine if the concern is still present.

Is the concern still present? 

1. Yes  : 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 Technical Service Bulletins (TSBs) address this concern, INSTALL a new SASM  .

   REFER to: STEERING ANGLE SENSOR MODULE (SASM) .

2. No  : 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.