Diagnostic Test

ENGINE DTCS PRESENT
1. With the scan tool, read Engine DTCs.
  Are there any Engine brake DTCs present?
  
  Yes
  - Refer to the appropriate Testing & Diagnostics article in Engine Performance and perform the appropriate diagnostic procedure.
  - Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 2
ABS MODULE DTCS PRESENT
1. With the scan tool, read ABS Module DTCs.
  Are there any ABS DTCs present?
  
  Yes
  - Refer to DIAGNOSIS AND TESTING and perform the appropriate diagnostic procedure.
  No
  - Go To 3
(L51) BRAKE SWITCH SIGNAL SHORTED TO GROUND

Fig 1: Checking Brake Switch Signal For Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off to the lock position.
2. Disconnect the Shift Lever Assembly harness connector.
  NOTE:
  Check connectors - Clean/repair as necessary.
3. Measure the resistance between ground and the (L51) Brake Switch Signal circuit.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (L51) Brake Switch Signal for a short to ground.
  - Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Using the schematics as a guide, inspect the wiring and connectors. Repair as necessary. Pay particular attention to all power and ground circuits. If no problems are found, replace the Shift Lever Assembly in accordance with the Service Information.
  - Perform the NAG1 TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .