Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, erase DTCs.
3. Press and release the Brake Pedal several times.
4. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - If there are previous complaints of the Stop Lamps always on, or the Speed Control will not activate, Go To 2.
  - If the Stop Lamps and Speed Control system operate correctly, test complete. The condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK FOR AN IMPROPERLY INSTALLED BRAKE SWITCH
1. Turn the ignition off.
2. Check the Brake Switch for proper installation, damage, or mechanical failure in accordance with the Service Information.
  Were any problems found?
  
  Yes
  - Repair as necessary and perform the "Brake Pedal Sensor Calibration" routine.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
COMPARE THE BRAKE PEDAL TRAVEL SENSOR SET POINT TO THE BRAKE PEDAL POSITION
NOTE:
The voltage of the Brake Pedal Travel Sensor Set point and Brake Pedal Position should be equal.
1. Start the engine.
2. With the scan tool, in ABS Data, compare the Brake Pedal Travel Sensor Set point voltage to the Brake Pedal Position voltage.
  Is the voltage difference between the ABS Data greater than 0.2 volts?
  
  Yes
  - Perform the "Brake Pedal Sensor Calibration" routine.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Brake Pedal Switch in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .