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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 >> C122A-Brake Booster Pedal Force Switch 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 C122A-BRAKE PEDAL FORCE SWITCH 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 and record DTC's.

    With the scan tool, read and record Freeze Fame information.

    With the scan tool, erase DTC's.

    CAUTION: Ensure brake capability is available before road testing.

    Test drive vehicle above 24 k/mh (15 mph).

    With the scan tool, read and record DTC's.

    Does the scan tool display: C122A-BRAKE PEDAL FORCE SWITCH 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/WIRING HARNESS FOR DAMAGE 

    Check all related wiring for bruised, chafed, pierced, or partially broken wires.

    Check all related connectors for broken, bent, pushed out, or corroded terminals.

    Were any problems found? 

    Yes 

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

    No 

    1. Go To step  3).
  3. 3)  CHECK THE VOLTAGE ON THE (B134) BRAKE PEDAL FORCE SWITCH CLOSE CIRCUIT 
    Fig 1: Checking Brake Pedal Force Switch Close Circuit
    GC0026951Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition on.

    Measure the voltage of the (B134) Brake Pedal Force Switch Close circuit by back probing at the Brake Travel Sensor harness connector.

    Is the voltage approximately 6 volts? 

    Yes 

    1. Go To step  7).

    No 

    1. Go To step  4).
  4. 4)  CHECK THE (B134) BRAKE PEDAL FORCE SWITCH CLOSE CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 2: Checking Brake Pedal Force Switch Close Circuit
    GC0026952Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Anti-Lock Brake Module harness connector.

    Disconnect the Brake Travel Sensor harness connector.

    Turn the ignition on.

    Measure the voltage of the (B134) Brake Pedal Force Switch Close circuit.

    Is there any voltage present? 

    Yes 

    1. Repair the (B134) Brake Pedal Force Switch Close circuit for a short to voltage.
    2. Perform ABS VERIFICATION TEST - VER 1 .

    No 

    1. Go To step  5).
  5. 5)  CHECK THE (B134) BRAKE PEDAL FORCE SWITCH CLOSE CIRCUIT FOR A SHORT TO GROUND 
    Fig 3: Checking Brake Pedal Force Switch Close Circuit
    GC0026953Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Measure the resistance between ground and the (B134) Brake Pedal Force Switch Close circuit.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the (B134) Brake Pedal Force Switch Close circuit for a short to ground.
    2. Perform ABS VERIFICATION TEST - VER 1 .

    No 

    1. Go To step  6).
  6. 6)  CHECK THE (B134) BRAKE PEDAL FORCE SWITCH CLOSE CIRCUIT FOR AN OPEN 
    Fig 4: Checking Brake Pedal Force Switch Close Circuit
    GC0026954Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (B134) Brake Pedal Force Switch Close 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 (B134) Brake Pedal Force Switch Close circuit for an open.
    2. Perform ABS VERIFICATION TEST - VER 1 .
  7. 7)  CHECK THE VOLTAGE ON THE (B135) BRAKE PEDAL FORCE SWITCH OPEN CIRCUIT 
    Fig 5: Checking Brake Pedal Force Switch Open Circuit
    GC0026955Courtesy of DAIMLERCHRYSLER CORP.

    Measure the voltage of the (B135) Brake Pedal Force Switch Open circuit by back probing at the Brake Travel Sensor harness connector.

    Is the voltage approximately 12 volts? 

    Yes 

    1. Go To step  11).

    No 

    1. Go To step  8).
  8. 8)  CHECK THE (B135) BRAKE PEDAL FORCE SWITCH OPEN CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 6: Checking Brake Pedal Force Switch Open Circuit
    GC0026956Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Anti-Lock Brake Module harness connector.

    Disconnect the Brake Travel Sensor harness connector.

    Turn the ignition on.

    Measure the voltage of the (B135) Brake Pedal Force Switch Open circuit.

    Is there any voltage present? 

    Yes 

    1. Repair the (B135) Brake Pedal Force Switch Open circuit for a short to voltage.
    2. Perform ABS VERIFICATION TEST - VER 1 .

    No 

    1. Go To step  9).
  9. 9)  CHECK THE (B135) BRAKE PEDAL FORCE SWITCH OPEN CIRCUIT FOR A SHORT TO GROUND 
    Fig 7: Checking Brake Pedal Force Switch Open Circuit
    GC0026957Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Measure the resistance between ground and the (B135) Brake Pedal Force Switch Open circuit.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the (B135) Brake Pedal Force Switch Open circuit for a short to ground.
    2. Perform ABS VERIFICATION TEST - VER 1 .

    No 

    1. Go To step  10).
  10. 10)  CHECK THE (B135) BRAKE PEDAL FORCE SWITCH OPEN CIRCUIT FOR AN OPEN 
    Fig 8: Checking Brake Pedal Force Switch Open Circuit
    GC0026958Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (B135) Brake Pedal Force Switch Open 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 (B135) Brake Pedal Force Switch Open circuit for an open.
    2. Perform ABS VERIFICATION TEST - VER 1 .
  11. 11)  CHECK THE VOLTAGE ON THE (B136) BRAKE PEDAL FORCE SWITCH SIGNAL CIRCUIT 
    Fig 9: Checking Brake Pedal Force Switch Signal Circuit
    GC0026959Courtesy of DAIMLERCHRYSLER CORP.

    Measure the voltage of the (B136) Brake Pedal Force Switch Signal circuit by back probing at the Brake Travel Sensor harness connector.

    Is the voltage approximately 6 volts? 

    Yes 

    1. Go To step  15).

    No 

    1. Go To step  12).
  12. 12)  CHECK THE (B136) BRAKE PEDAL FORCE SWITCH SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 10: Checking Brake Pedal Force Switch Signal Circuit
    GC0026960Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Anti-Lock Brake Module harness connector.

    Disconnect the Brake Travel Sensor harness connector.

    Turn the ignition on.

    Measure the voltage of the (B136) Brake Pedal Force Switch Signal circuit.

    Is there any voltage present? 

    Yes 

    1. Repair the (B136) Brake Pedal Force Switch Signal circuit for a short to voltage.
    2. Perform ABS VERIFICATION TEST - VER 1 .

    No 

    1. Go To step  13).
  13. 13)  CHECK THE (B136) BRAKE PEDAL FORCE SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    Fig 11: Checking Brake Pedal Force Switch Signal Circuit
    GC0026961Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Measure the resistance between ground and the (B136) Brake Pedal Force Switch Signal circuit.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the (B136) Brake Pedal Force Switch Signal circuit for a short to ground.
    2. Perform ABS VERIFICATION TEST - VER 1 .

    No 

    1. Go To step  14).
  14. 14)  CHECK THE (B136) BRAKE PEDAL FORCE SWITCH SIGNAL CIRCUIT FOR AN OPEN 
    Fig 12: Checking Brake Pedal Force Switch Signal Circuit
    GC0026962Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (B136) Brake Pedal Force Switch Signal 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 (B136) Brake Pedal Force Switch Signal circuit for an open.
    2. Perform ABS VERIFICATION TEST - VER 1 .
  15. 15)  CHECK THE VOLTAGE ON THE (B134) BRAKE PEDAL FORCE SWITCH CLOSE CIRCUIT 
    Fig 13: Checking Brake Pedal Force Switch Close Circuit
    GC0026951Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition on.

    Measure the voltage of the (B134) Brake Pedal Force Switch Close circuit by back probing at the Brake Travel Sensor harness connector.

    Depress and hold the brake pedal.

    Is the voltage approximately 12 volts? 

    Yes 

    1. Go To step  16).

    No 

    1. Replace the Brake Travel Sensor in accordance with the Service Information.
    2. Perform ABS VERIFICATION TEST - VER 1 .
  16. 16)  CHECK THE VOLTAGE ON THE (B135) BRAKE PEDAL FORCE SWITCH OPEN CIRCUIT 
    Fig 14: Checking Brake Pedal Force Switch Open Circuit
    GC0026955Courtesy of DAIMLERCHRYSLER CORP.

    Measure the voltage of the (B135) Brake Pedal Force Switch Open circuit by back probing at the Brake Travel Sensor harness connector.

    Depress and hold the brake pedal.

    Is the voltage approximately 6 volts? 

    Yes 

    1. Go To step  17).

    No 

    1. Replace the Brake Travel Sensor in accordance with the Service Information.
    2. Perform ABS VERIFICATION TEST - VER 1 .
  17. 17)  CHECK THE VOLTAGE ON THE (B136) BRAKE PEDAL FORCE SWITCH SIGNAL CIRCUIT 
    Fig 15: Checking Brake Pedal Force Switch Signal Circuit
    GC0026959Courtesy of DAIMLERCHRYSLER CORP.

    Measure the voltage of the (B136) Brake Pedal Force Switch Signal circuit by back probing at the Brake Travel Sensor harness connector.

    Depress and hold the brake pedal.

    Is the voltage approximately 6 volts? 

    Yes 

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

    No 

    1. Replace the Brake Travel Sensor in accordance with the Service Information.
    2. Perform ABS VERIFICATION TEST - VER 1 .
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