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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 542 (Anti-Lock Brake System & Brake Controller - Electrical Diagnostics) >> DTC Troubleshooting >> Antilock Brake System & Electronic Stability Program >> C100A-Left Front Wheel Speed Sensor Circuit >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1)  CHECK FOR A DTC C100A-LEFT FRONT WHEEL SPEED SENSOR CIRCUIT 
    NOTE: This DTC must be active for the results of this test to be valid.

    Turn the ignition on.

    With the scan tool, read DTCs.

    Record DTC and Freeze Frame information.

    With the scan tool, erase DTCs.

    Cycle the ignition switch off then on.

    With the scan tool, read DTCs.

    Does the scan tool display: C100A-LEFT FRONT WHEEL SPEED SENSOR CIRCUIT? 

    Yes 

    1. Go To step  2).

    No 

    1. Refer ABS-INTERMITTENT CONDITION .
    2. Perform ABS VERIFICATION TEST - VER 1 .
  2. 2)  CHECK THE TERMINALS/CONNECTORS/TONE WHEEL FOR DAMAGE 
    NOTE: Check all related wiring for bruised, chafed, pierced, or partially broken wires.
    NOTE: Check all related connectors for broken, bent, pushed out, or corroded terminals.
    NOTE: Check the tone wheel teeth for missing teeth, cracks, or looseness. Teeth should be perfectly square, not bent, or nicked.

    Turn the ignition off.

    Inspect the Anti-Lock Brake Module harness connector, Left Front WSS, Left Front WSS harness connector, and Left Front WSS tone wheel (if applicable).

    Were any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform ABS VERIFICATION TEST - VER 1 .

    No 

    1. Go To step  3).
  3. 3)  (B8) LEFT FRONT WSS SIGNAL CIRCUIT SHORTED TO THE (B9) LEFT FRONT WSS SUPPLY CIRCUIT 
    Fig 1: Checking Left Front WSS Signal Circuit & Supply Circuit
    GC0026871Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Anti-Lock Brake Module harness connector.

    Disconnect the Left Front WSS harness connector.

    Measure the resistance between the (B8) Left Front WSS Signal and the (B9) Left Front WSS Supply circuits at the Left Front WSS harness connector.

    Is the resistance above 5.0 ohms? 

    Yes 

    1. Go To step  4).

    No 

    1. Repair the (B8) Left Front WSS Signal circuit for a short to the (B9) Left Front WSS Supply circuit.
    2. Perform ABS VERIFICATION TEST - VER 1 .
  4. 4)  CHECK THE VOLTAGE ON THE (B9) LEFT FRONT WSS SUPPLY CIRCUIT 
    Fig 2: Checking Left Front WSS Supply Circuit
    GC0026872Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Connect the Anti-Lock Brake Module harness connector.

    Turn the ignition on.

    Measure the voltage of the (B9) Left Front WSS Supply circuit in the Left Front WSS harness connector.

    Is the voltage above 10 volts? 

    Yes 

    1. Go To step  8).

    No 

    1. Go To step  5).
  5. 5)  (B9) LEFT FRONT WSS SUPPLY CIRCUIT SHORT TO VOLTAGE 
    Fig 3: Checking Left Front WSS Supply Circuit
    GC0026872Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Anti-Lock Brake Module harness connector.

    Turn the ignition on.

    Measure the voltage of the (B9) Left Front WSS Supply circuit.

    Is there any voltage present? 

    Yes 

    1. Repair the (B9) Left Front WSS Supply circuit for a short to voltage.
    2. Perform ABS VERIFICATION TEST - VER 1 .

    No 

    1. Go To step  6).
  6. 6)  (B9) LEFT FRONT WSS SUPPLY CIRCUIT SHORT TO GROUND 
    Fig 4: Checking Left Front WSS Supply Circuit
    GC0026873Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Measure the resistance between ground and the (B9) Left Front WSS Supply circuit.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the (B9) Left Front WSS Supply circuit for a short to ground.
    2. Perform ABS VERIFICATION TEST - VER 1 .

    No 

    1. Go To step  7).
  7. 7)  (B9) LEFT FRONT WSS SUPPLY CIRCUIT OPEN 
    Fig 5: Checking Left Front WSS Supply Circuit
    GC0026874Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (B9) Left Front WSS Supply circuit.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Replace the Anti-Lock Brake Module in accordance with the Service Information.
    2. Perform ABS VERIFICATION TEST - VER 1 .

    No 

    1. Repair the (B9) Left Front WSS Supply circuit for an open.
    2. Perform ABS VERIFICATION TEST - VER 1 .
  8. 8)  CHECK THE (B9) LEFT FRONT WSS SUPPLY AND THE (B8) LEFT FRONT WSS SIGNAL VOLTAGE 
    Fig 6: Checking Left Front WSS Signal Circuit & Supply Circuit
    GC0026875Courtesy of DAIMLERCHRYSLER CORP.

    Measure the voltage between the (B9) Left Front WSS Supply and (B8) Left Front WSS Signal circuits at the Left Front WSS harness connector.

    Is the voltage above 10 volts? 

    Yes 

    1. Go To step  11).

    No 

    1. Go To step  9).
  9. 9)  (B8) LEFT FRONT WSS SIGNAL CIRCUIT SHORT TO VOLTAGE 
    Fig 7: Checking Left Front WSS Signal Circuit
    GC0026876Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Anti-Lock Brake Module harness connector.

    Turn the ignition on.

    Measure the voltage of the (B8) Left Front WSS Signal circuit.

    Is there any voltage present? 

    Yes 

    1. Repair the (B8) Left Front WSS Signal circuit for a short to voltage.
    2. Perform ABS VERIFICATION TEST - VER 1 .

    No 

    1. Go To step  10).
  10. 10)  (B8) LEFT FRONT WSS SIGNAL CIRCUIT OPEN 
    Fig 8: Checking Left Front WSS Signal Circuit
    GC0026877Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Measure the resistance of the (B8) Left Front WSS Signal circuit.

    Is the resistance above 5.0 ohms? 

    Yes 

    1. Repair the (B8) Left Front WSS Signal circuit for an open.
    2. Perform ABS VERIFICATION TEST - VER 1 .

    No 

    1. Replace the Anti-Lock Brake Module in accordance with the Service Information.
    2. Perform ABS VERIFICATION TEST - VER 1 .
  11. 11)  CHECK THE (B8) LEFT FRONT WSS SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    Fig 9: Checking Left Front WSS Signal Circuit
    GC0026878Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Measure the resistance between ground and the (B8) Left Front WSS Signal circuit.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the (B8) Left Front WSS Signal circuit for a short to ground.
    2. Perform ABS VERIFICATION TEST - VER 1 .

    No 

    1. Go To step  12).
  12. 12)  CHECK THE (B8) LEFT FRONT WSS SIGNAL VOLTAGE AT THE LEFT FRONT WSS HARNESS CONNECTOR 
    Fig 10: Checking Left Front WSS Signal Voltage
    GC0026879Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Reconnect all connectors.

    Turn the ignition on.

    While back probing, measure the voltage between the (B8) Left Front WSS Signal circuit at the Left Front WSS harness connector and ground.

    Slowly rotate the wheel by hand.

    Does the (B8) Left Front WSS Signal circuit voltage toggle between approximately 1.6 and.8 volts? 

    Yes 

    1. Go To step  13).

    No 

    1. Replace the Left Front WSS in accordance with the Service Information.
    2. Perform ABS VERIFICATION TEST - VER 1 .
  13. 13)  CHECK THE (B8) LEFT FRONT WSS SIGNAL VOLTAGE AT THE ANTI-LOCK BRAKE MODULE HARNESS CONNECTOR 
    Fig 11: Checking Left Front WSS Signal Voltage
    GC0026880Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Turn the ignition on.

    While back probing, measure the voltage between the (B8) Left Front WSS Signal circuit at the Anti-Lock Brake Module harness connector and ground.

    Slowly rotate the wheel by hand.

    Does the (B8) Left Front WSS Signal circuit voltage toggle between approximately 1.6 and.8 volts? 

    Yes 

    1. Replace the Anti-Lock Brake Module in accordance with the Service Information.
    2. Perform ABS VERIFICATION TEST - VER 1 .

    No 

    1. Repair the (B8) Left Front WSS Signal circuit for an open.
    2. Perform ABS VERIFICATION TEST - VER 1 .
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