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 AN ACTIVE DTC
NOTE:
If there are any ASD/Main Relay or system voltage DTCs present, diagnose those DTCs before proceeding with this test procedure.
1. Turn the ignition on.
2. With the scan tool, read DTCs. Copy DTC and Freeze Frame information and erase DTCs.
  NOTE:
  Active or pending DTCs may not allow A/C Clutch actuation, make sure all DTCs are cleared before proceeding with this test procedure.
3. With the scan tool, actuate the A/C Compressor Clutch.
4. Monitor the scan tool for at least two minutes.
5. With the scan tool, read DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
A/C CLUTCH RELAY
1. Turn the ignition off.
2. Install a know good relay in place of the existing A/C Clutch Relay.
3. Using a scan tool, erase the DTC.
4. Start the engine and turn the A/C on.
  Does the DTC return?
  
  Yes
  - Go To 3
  No
  - Replace the A/C Clutch Relay.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (C13) A/C CLUTCH RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Remove the A/C Clutch Relay from the PDC.
3. Disconnect the PCM C2 harness connector.
4. Check for continuity between ground and the (C13) A/C Clutch Relay Control circuit at the A/C Clutch Relay in the PDC.
  Is there continuity between ground and the (C13) A/C Clutch Relay Control circuit at the A/C Clutch Relay in the PDC?
  
  Yes
  - Repair the (C13) A/C Clutch Relay Control circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 4
CHECK THE (C13) A/C CLUTCH CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
NOTE:
The GPEC Diagnostic adapter tool can now be used on Cummins applications by utilizing harness adapter 10436-4.

CAUTION:
Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the GPEC Diagnostic Adaptor to perform the diagnosis.
1. Connect the (special tool #10436-4, Adapter, GPEC Diagnostic Harness).
2. Measure the resistance of the (C13) A/C Clutch Control circuit between the A/C Clutch Relay in the PDC and the GPEC Adaptor.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the (C13) A/C Clutch Control circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
POWERTRAIN CONTROL MODULE
1. Disconnect all PCM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
5. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Using the recorded Freeze Frame and Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read PCM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL, 6.7L DIESEL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Test complete.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .