Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

BRAKE PEDAL CALIBRATION
1. Turn the ignition on.
2. With the scan tool, read and record the ABS DTCs.
3. Park the vehicle.
  NOTE:
  When performing the Brake Pedal Calibration routine, make sure the brake pedal is not pressed.
4. With the scan tool, under "Miscellaneous Functions" run the Brake Pedal Calibration routine.
  Was the Brake Pedal Calibration routine successful?
  
  Yes
  - Go To 2
  No
  - Perform the Brake Pedal Calibration routine again, if still unsuccessful.
  - Go To 3
VERIFY THE DTC IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, erase the DTCs.
3. Start the engine.
4. Press the brake pedal slowly.
5. With the scan tool, read ABS DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go To 3
  No
  - Test complete.
INSPECT THE BRAKE PEDAL POSITION (BPP) SENSOR FOR INCORRECT INSTALLATION, DAMAGE OR MECHANICAL FAILURE
1. Turn the ignition off.
2. Visually inspect the BPP Sensor for Improper installation, damage or mechanical failure. Refer to SENSOR, STOP LAMP, INSTALLATION .
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 5
BRAKE PEDAL POSITION (BPP) SENSOR VOLTAGE
1. Turn the ignition on.
2. With the scan tool, under "Data Display" monitor the Master Cylinder Brake Pressure and the Brake Pedal Sensor voltage.
3. Press the brake pedal slowly.
  Did the Master Cylinder Brake Pressure change but the Brake Pedal Sensor voltage did NOT change?
  
  Yes
  - Go To 6
  No
  - Go To 5
BRAKE SYSTEM SIGNALS
1. Turn the ignition on.
2. With the scan tool, under "Data Display" monitor the Master Cylinder Brake Pressure and the Brake Pedal Sensor voltage.
3. Press the brake pedal slowly.
  Did the Master Cylinder Brake Pressure and the Brake Pedal Sensor voltage change?
  
  Yes
  - Go To 6
  No
  - Replace the Anti-lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
BRAKE PEDAL POSITION (BPP) SENSOR
1. Turn the ignition off.
2. Disconnect the BPP Sensor harness connector.
3. Turn the ignition on.
4. Measure the voltage at the BPP Sensor harness connector between the (B237) BPP Sensor Feed and the (B937) BPP Sensor Return.
  Is the voltage above 4.75 volts?
  
  Yes
  - Replace the Brake Pedal Position (BPP) Sensor in accordance with the Service Information. Refer to SENSOR, STOP LAMP, REMOVAL .
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace the Anti-lock Brake System (ABS) Module in accordance with the service information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .