Diagnostic Test

WARNING: This page is about a different car, the 2009 Dodge Sprinter. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR FCM CAN BUS DTCS
1. With the scan tool, read FCM DTCs.
  Are there any FCM CAN BUS DTCs present?
  
  Yes
  - Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure and perform the appropriate diagnostic procedure.
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure
  No
  - Go to step 2
CHECK IF ENGINE DTCS ARE PRESENT
1. With the scan tool, read engine DTCs.
  Are there any engine DTCs present?
  
  Yes
  - Refer to DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure and perform the appropriate diagnostic procedure.
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure
  No
  - Using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM in accordance with the Service Information.
  - Perform NAG1 TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure