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.

CHECK FOR ACTIVE BUS COMMUNICATION DTCS
1. Turn the ignition on.
2. With the scan tool, read BCM DTCs and record on the repair order.
  Are there any Active BUS Communication DTCs present?
  
  Yes
  - Refer to the BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX - 2500 HD & 3500 HD article and perform the appropriate diagnostic procedure.
  No
  - Go To 2
CHECK FOR STORED BUS COMMUNICATION DTCS
1. Turn the ignition on.
2. With the scan tool, read DTCs.
  Are there any inactive or stored BUS Communication DTCs present?
  
  Yes
  - Refer to DIAGNOSIS AND TESTING and perform the STORED LOST COMMUNICATION DTCs diagnostic procedure.
  No
  - Go To 3
CHECK FOR PCM A/C COMPRESSOR DTCS
1. Turn the ignition on.
2. With the scan tool, read PCM DTCs and record on the repair order.
  Are there any PCM A/C Compressor DTCs present?
  
  Yes
  - Refer to the DTC INDEX - 2500 HD & 3500 HD article and perform the appropriate diagnostic procedure.
  - Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
CHECK THE A/C COMPRESSOR
1. Start the Engine.
2. Using the A/C heater Control, request A/C maximum cool.
  Does the A/C Compressor Clutch engage?
  
  Yes
  - Go To 5
  No
  - Diagnose and repair the A/C Compressor in accordance with the service information.
CHECK IF THE DTC RESETS
1. Turn the ignition off.
2. Turn the ignition on.
3. With the scan tool, erase HVAC DTCs.
4. Turn the ignition off.
5. Turn the ignition on.
6. With the scan tool, perform the A/C Cool down Test. Follow the instructions on the scan tool.
7. With the scan tool, read HVAC DTCs.
  Does this DTC reset?
  
  Yes
  - Replace and program the A/C Heater Module in accordance with the Service Information. Refer to CONTROL, A/C AND HEATER, REMOVAL .
  - Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 6
CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.
3. 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.
4. Wiggle the wiring and connectors while checking for shorted and open circuits.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test complete.