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Pinpoint Test G: DTC C1996

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. G1 CHECK FOR ABS MODULE DTCs 
    • Review the DTCs retrieved during Inspection and Verification.
    • Are any ABS module DTCs other than C1996 present? 
    1. Yes:  REPAIR all other DTCs before repairing C1996. GO to the ABS MODULE DTC CHART .
    2. No:  GO to G2  .
  2. G2 CHECK RETURNING DTCs 
    • Connect the scan tool.
    • Ignition ON.
    • Using the scan tool, clear all ABS module DTCs.
    • Cycle the ignition switch from RUN to OFF and back to RUN.
    • Test drive the vehicle above 49 km/h (30 mph).
    • Enter the following diagnostic mode on the scan tool: Self Test - ABS Module.
    • Are any ABS module DTCs present? 
    1. Yes:  If only  DTC C1996 is present, GO to G3 . 

      If DTC C1996 is present along with other DTCs, REPAIR the other DTCs before repairing DTC C1996. GO to the ABS MODULE DTC CHART .

    2. No:  The condition is not present at this time.
  3. G3 CHECK THE WHEEL SPEED SENSOR PIDs 
    • Enter the following diagnostic mode on the scan tool: DataLogger - ABS Module.
    • While driving the vehicle, have an assistant monitor the following wheel speed sensor PIDs:
      • Left Front Wheel Speed Sensor (LF_WSPD)
      • Right Front Wheel Speed Sensor (RF_WSPD)
      • Left Rear Wheel Speed Sensor (LR_WSPD)
      • Right Rear Wheel Speed Sensor (RR_WSPD)
    • Do all the PIDs match the vehicle speed and match each other? 
    1. Yes:  GO to  G8.
    2. No:  GO to G4  .
  4. G4 INSPECT THE WHEEL SPEED SENSOR MOUNTING 
    1. Yes:  GO to G5  .
    2. No:  TIGHTEN the wheel speed sensor bolt to specification. REFER to SPECIFICATIONS . CLEAR the DTCs. REPEAT the self-test.
  5. G5 INSPECT THE WHEEL SPEED SENSOR AND HARNESS FOR DAMAGE 
      NOTE: Examine the wheel speed sensor harness carefully with a good light source. Failure to verify damage in the sensor harness can lead to unnecessary installation of a new component.
    • Inspect the suspect wheel speed sensor and harness for cuts, broken tabs, broken casing or corrosion.
    • Are the wheel speed sensor and harness OK? 
    1. Yes:  GO to G6  .
    2. No:  INSTALL a new wheel speed sensor. REFER to WHEEL SPEED SENSOR - FRONT  or WHEEL SPEED SENSOR - REAR . CLEAR the DTCs. REPEAT the self-test.
  6. G6 INSPECT THE WHEEL SPEED SENSOR RING FOR DAMAGE 
      NOTE: Examine the wheel speed sensor ring carefully with a good light source. Failure to verify damage in the sensor ring can lead to unnecessary installation of a new component.
    • Inspect the suspect wheel speed sensor ring for cracks, chips or missing teeth. Rotate the wheel to verify that no teeth are missing.
    • Is the wheel speed sensor ring OK? 
    1. Yes:  GO to G7  .
    2. No:  INSTALL a new wheel speed sensor ring. REFER to WHEEL SPEED SENSOR RING - FRONT  or WHEEL SPEED SENSOR RING - REAR . CLEAR the DTCs. REPEAT the self-test.
  7. G7 INSPECT THE WHEEL BEARING FOR DAMAGE AND LOOSENESS 
    • Verify that the wheel bearing has no end-play and is undamaged.
    • Is the wheel bearing OK? 
    1. Yes:  INSTALL a new wheel speed sensor. REFER to WHEEL SPEED SENSOR - FRONT  or WHEEL SPEED SENSOR - REAR . CLEAR the DTCs. REPEAT the self-test.
    2. No:  INSTALL a new wheel bearing and wheel hub as necessary. REFER to FRONT SUSPENSION for front wheel hubs or REAR SUSPENSION for rear wheel hubs. CLEAR the DTCs. REPEAT the self-test.
  8. G8 CHECK THE ABS MODULE YAW RATE (YAW_RATE) PID 
      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.
    • Is the YAW_RATE PID value between -0.05 and 0.05? 
    1. Yes:  GO to G9  .
    2. No:  GO to  G12.
  9. G9 CHECK THE ABS MODULE LATERAL ACCELERATION (LAT_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.
    • Monitor the LAT_ACCL PID.
    • Is the LAT_ACCL PID value between -0.007 and 0.007? 
    1. Yes:  GO to G10  .
    2. No:  GO to  G12.
  10. G10 CHECK THE ABS MODULE LONGITUDINAL ACCELERATION (LONG_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.
    • Monitor the LONG_ACCL PID.
    • Is the LONG_ACCL PID value between -0.004 and 0.004? 
    1. Yes:  GO to G11  .
    2. No:  GO to  G12.
  11. G11 CHECK THE ABS MODULE ROLL RATE (ROLL_RAT) PID 
    NOTE: The vehicle must be on level ground and at a complete standstill. Any vehicle movement will result in false values for this test.
    • Monitor the ROLL_RAT PID.
    • Is the ROLL_RAT PID value between -0.05 and 0.05? 
    1. Yes:  GO to  G13.
    2. No:  GO to G12  .
  12. G12 CHECK THE RCM INSTALLATION AND MOUNTING SURFACE 
    • Ignition OFF.
    • Depower the Supplemental Restraint System (SRS). Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
    • After depowering the system, refer to Restraints Control Module (RCM) Removal and Installation in RESTRAINTS CONTROL MODULE (RCM) . Adhere to all safety warnings in the procedure while inspecting the Restraints Control Module (RCM) for damage or incorrect mounting.
    • Inspect the RCM  installation and make sure that the nuts are fully seated and tightened correctly. Refer to Restraints Control Module (RCM) in RESTRAINTS CONTROL MODULE (RCM) .
    • Inspect the 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  G14.
    2. No:  REPAIR or INSTALL new as necessary. CLEAR the DTC. REPEAT the self-test.
  13. G13 CHECK THE STEERING WHEEL ANGLE SENSOR POSITION (SWA_POS) PID 
      NOTE: The steering wheel angle sensor information is sent to the ABS module from the Power Steering Control Module (PSCM) over the High Speed Controller Area Network (HS-CAN) bus.
    • Monitor the SWA_POS PID while rotating the steering wheel clockwise and counterclockwise very slowly, from lock to lock.
    • Does the PID change in intervals of 4.5 degrees and show a 360 degree increase for each complete revolution of the steering wheel? 
    1. Yes:  GO to G14  .
    2. No:  REFER to STEERING SYSTEM to continue diagnosis of the steering wheel angle sensor.
  14. G14 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect: ABS Module C155.
    • Check the connector for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect: ABS Module C155.
    • Make sure the ABS module electrical connector is fully seated, then operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes:  INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING . CLEAR the DTCs. REPEAT the self-test.
    2. No:  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. REPOWER the SRS  . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING . CLEAR the DTCs. REPEAT the self-test.
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