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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Antilock Brake System (Abs) - Electrical Diagnostics) >> DTC Troubleshooting >> C0030-02-Left Front Tone Wheel - General Signal Failure >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2014 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.
  1. VERIFY THE DTC IS ACTIVE 
    NOTE:

    This DTC must be active for the results of this test to be valid. If DTC C0030-1D is present it must be repaired before continuing.

    1. Turn the ignition on.
    2. With the scan tool, read DTCs.
    3. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
    4. With the scan tool, erase DTCs.
    5. Cycle the ignition switch off then on.
      CAUTION:

      Ensure brake capability is available before road testing.

    6. Test drive the vehicle in a straight line to 40 km/h (25 mph).
      NOTE:

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

    7. With the scan tool, read DTCs.

      Is the DTC active at this time?

      Yes 

      • Go To  3

      No 

      • Go To  2
  2. CHECK WHEEL SPEED SENSOR SIGNALS 
    1. Turn the ignition on.
    2. With the scan tool, monitor and graph ALL the WSS speeds and compare graph while an assistant drives the vehicle.
      NOTE:

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

    3. Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph).

      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 

  3. CHECK FOR IMPROPER LEFT FRONT TIRE PRESSURE/MISMATCHED TIRES 
    1. Turn the ignition off.
    2. Check and adjust the Left Front Tire pressure.
    3. Check and adjust all other tire pressures.
    4. Inspect for mismatched tires on vehicle.

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

      Yes 

      No 

      • Go To  4
  4. CHECK THE LEFT FRONT TONE WHEEL/BEARING FOR DAMAGE 
    NOTE:

    Check the tone wheel teeth for missing teeth, cracks, or looseness. Teeth should be perfectly square, not bent, or nicked.

    1. Check the Left Front Tone Wheel/Bearing for damage.
    2. Check the Left Front Tone Wheel for dirt.

      Was the tone wheel dirty?

      Yes 

      • Clean tone wheel and sensor. Clear codes and retest.
      • Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Replace the Left Front Tone Wheel/Bearing in accordance with the Service Information.
      • Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .