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Home >> Chrysler >> 2003 >> PT Cruiser Limited, Standard >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Chassis Diagnostic Procedures - Anti-Lock Brake System >> Diagnostic Information And Procedures >> Brakes (Cab) - Symptoms >> Symptom List: LF WHEEL SPEED/SIGNAL FAILURE; LR WHEEL SPEED/SIGNAL FAILURE; RF WHEEL SPEED/SIGNAL FAILURE; RR WHEEL SPEED/SIGNAL FAILURE >> Diagnostic Procedure

Diagnostic Procedure

LF WHEEL SPEED/SIGNAL FAILURE

TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIII®, read DTCs.
With the DRBIII®, read Freeze Frame information.
NOTE: The CAB must sense ALL 4 wheels at 25 km/h (15 mph) before it will extinguish the ABS indicators.

Does the DRBIII® display WHEEL SPEED/SIGNAL FAILURE and SENSOR CIRCUIT FAILURE?
  1. Yes --> Refer to the affected Wheel Speed in LF SENSOR CIRCUIT FAILURE; LR SENSOR CIRCUIT FAILURE; RF SENSOR CIRCUIT FAILURE; RR SENSOR CIRCUIT FAILURE  for the related symptom(s).

    Perform ABS VERIFICATION TEST - VER 1 .

  2. No --> Go To 2
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2 Turn the ignition on.
With the DRBIII® in Sensors, monitor ALL the Wheel Speed Sensor Signals while an assistant drives the vehicle.
Slowly accelerate as straight as possible from a stop to 24 km/h (15 mph).
Is the affected Wheel Speed Signal showing 0 km/h (0 mph)?
  1. Yes --> Go To 3
  2. No --> The condition is not present at this time. Monitor DRBIII® parameters while wiggling the related wiring harness. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness and connector terminals.

    Perform ABS VERIFICATION TEST - VER 1 .

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3 Turn the ignition off.
Inspect the CAB connector, affected Wheel Speed Sensor, and affected Wheel Speed Sensor connector.
Is the Wheel Speed Sensor or any connector damaged?
  1. Yes --> Repair as necessary.

    Perform ABS VERIFICATION TEST - VER 1 .

  2. No --> Go To 4
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4 Turn ignition off.
Inspect the affected Tone Wheel for damaged, missing teeth, cracks, or looseness
NOTE: The Tone Wheel teeth should be perfectly square, not bend, or nicked.

Is the affected Tone Wheel OK?
  1. Yes --> Go To 5
  2. No --> Replace the Tone Wheel in accordance with the Service Information.

    Perform ABS VERIFICATION TEST - VER 1 .

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5 Turn the ignition off.
Using a Feeler Gauge, measure the affected Wheel Speed Sensor Air Gap.
NOTE: Refer to the appropriate service information, if necessary, for procedures or specifications.

Is the Air Gap OK?
  1. Yes --> Go To 6
  2. No --> Repair as necessary.

    Perform ABS VERIFICATION TEST - VER 1 .

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6 Turn the ignition off.
Inspect the wheel bearings for excessive runout or clearance.
NOTE: Refer to the appropriate service information, if necessary, for procedures or specifications.

Is the bearing clearance OK ?
  1. Yes --> Go To 7
  2. No --> Repair as necessary.

    Perform ABS VERIFICATION TEST - VER 1 .

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7 Turn the ignition off.
Visually inspect brakes for locking up due to lining contamination or overheating.
Inspect all Components for defects which may cause a Signal DTC to set.
Is any Component Damaged?
  1. Yes --> Repair as necessary.

    Perform ABS VERIFICATION TEST - VER 1 .

  2. No --> Refer to symptom LF SENSOR CIRCUIT FAILURE; LR SENSOR CIRCUIT FAILURE; RF SENSOR CIRCUIT FAILURE; RR SENSOR CIRCUIT FAILURE  for further diagnostics.

    Perform ABS VERIFICATION TEST - VER 1 .

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