Diagnostic Test

ENGINE DTCs PRESENT
1. With the scan tool, read Engine DTCs.
  Are there any Engine brake DTCs present?
  
  Yes
  - Refer to DTC Based Diagnostics and perform the appropriate diagnostic procedure.
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .
  No
  - Go to step 2
ABS MODULE DTCs PRESENT
1. With the scan tool, read ABS Module DTCs.
  Are there any ABS DTCs present?
  
  Yes
  - Refer to DTC Based Diagnostics and perform the appropriate diagnostic procedure.
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .
  No
  - Go to step 3
(L51) BRAKE SWITCH SIGNAL OPEN

Fig 1: Checking Brake Switch Signal For Open
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position.
2. Disconnect the Shift Lever Assembly harness connector.
3. Disconnect the Stop Lamp Switch harness connector.
  NOTE: Check connectors - Clean/repair as necessary.
4. Measure the resistance of the (L51) Brake Switch Signal circuit between the Shift Lever Assembly harness connector and the Stop Lamp Switch.
  Is the resistance above 5.0 ohms?
  
  Yes
  - Repair the (L51) Brake Switch Signal for an open.
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .
  No
  - Go to step 4
(L51) BRAKE SWITCH SIGNAL SHORT TO VOLTAGE

Fig 2: Checking Brake Switch Signal For Short To Voltage
Courtesy of CHRYSLER 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. Turn the ignition on.
4. Measure the voltage of the (L51) Brake Switch Signal circuit.
  Is the voltage above 0.5 volts?
  
  Yes
  - Repair the (L51) Brake Switch Signal for a short to voltage.
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .
  No
  - Replace the Shift Lever Assembly in accordance with the Service Information.
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .