C1014-LEFT FRONT WHEEL SPEED COMPARATIVE PERFORMANCE

For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    With the ignition on.

  • Set Condition:

    When the Left Front Wheel Speed Sensor (WSS) Signal reading is different from the readings received from the other WSS's at a vehicle speed above 40 km/h (25 mph). The Anti-Lock Brake Module compares WSS readings from side-to-side on an axle and front-to-rear.


Possible Causes
  
LEFT FRONT WSS LOOSE — B8, B9 CIRCUITS/CONNECTOR/TERMINAL DAMAGE
  
IMPROPER LEFT FRONT TIRE PRESSURE/MISMATCHED TIRES
  
LEFT FRONT TONE WHEEL/BEARING DAMAGE
  
LEFT FRONT WSS
  
ANTI-LOCK BRAKE MODULE
  



Diagnostic Test

1.CHECK FOR DTC C1014-LEFT FRONT WHEEL SPEED COMPARATIVE PERFORMANCE

NOTE: This DTC must be active for the results of this test to be valid.





NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be meet.




Does the scan tool display: C1014-LEFT FRONT WHEEL SPEED COMPARATIVE PERFORMANCE active?

Yes
  • Go To 3


No
  • Go To 2

2.CHECK WHEEL SPEED SENSOR SIGNALS



NOTE: If graph shows periodic dropouts pay close attention to the tone wheel.




Is the Left Front WSS speed showing 0 km/h (0 mph) or not matching other wheels or showing erratic behavior?

Yes
  • Go To 3


No
  • The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
  • Refer to the ABS-INTERMITTENT CONDITION TEST. (Refer to 5 - BRAKES - DIAGNOSIS AND TESTING)

3.CHECK FOR IMPROPER LEFT FRONT TIRE PRESSURE/MISMATCHED TIRES






Is the Left Front Tire improperly inflated or mismatched tires on vehicle?

Yes


No
  • Go To 4

4.CHECK LEFT FRONT WSS LOOSENESS, INSPECT B8, B9 CIRCUITS/TERMINALS FOR DAMAGE

NOTE: Check all terminals for broken, bent, pushed out, or corroded terminals






Is the Left Front WSS loose or any of the wiring/connectors/terminals damaged?

Yes


No
  • Go To 5

5.CHECK LEFT FRONT WHEEL SPEED SENSOR FOR DAMAGE




Is the Left Front Wheel Speed Sensor damaged?

Yes


No
  • Go To 6

6.CHECK LEFT FRONT TONE WHEEL/BEARING FOR DAMAGE


NOTE: The Tone Wheel teeth should be perfectly square, not bent, or nicked.



Is the Left Front Tone Wheel/Bearing damaged?

Yes


No
  • Go To 7

7.LEFT FRONT WHEEL SPEED SENSOR


(Refer to 5 - BRAKES - STANDARD PROCEDURE)

NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met.




Did DTC C1014-LEFT FRONT WHEEL SPEED COMPARATIVE PERFORMANCE reset?

Yes


No
  • Test Complete.