Diagnostic Test

WARNING: This page is about a different car, the 2016 RAM 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read TCM DTCs and record on the repair order.
2. Record the Event Data and Environmental Data.
3. With the scan tool, erase DTCs.
4. Using the recorded Event and Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. Read TCM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Go To 10
CHECK FOR BCM DTCS
1. With the scan tool, read BCM DTCs.
  Are any BCM Ignition Run/Start relay control DTC(s) stored?
  
  Yes
  - Repair BCM Ignition Run/Start relay control DTC(s). Refer to BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX - 2500 HD & 3500 HD .
  No
  - Go To 3
CHECK THE (F946) IGNITION RUN/START CIRCUIT STATUS
1. Turn the ignition on.
2. With the scan tool, read the Ignition Run/Start (Run IG2 Switch) status.
  Does the Ignition Run/Start (Run IG2 Switch) status indicate OPEN?
  
  Yes
  - Go To 4
  No
  - Go To 10
CHECK THE F77 FUSE
1. Turn the ignition off.
2. Check the F77 fuse for an open.
  Is the fuse open?
  
  Yes
  - Go To 8
  No
  - Go To 5
CHECK THE (F946) IGNITION RUN/START CIRCUIT FOR VOLTAGE
1. Turn the ignition off.
2. Disconnect the TCM C1 harness connector.
3. Turn the ignition on.
  NOTE:
  The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
4. Using a 12-volt test light connected to ground, check the (F946) Ignition Run/Start circuit at the TCM C1 harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 9
  No
  - Go To 6
CHECK THE (F946) IGNITION RUN/START CIRCUIT
1. Turn the ignition off.
2. Install a substitute Ignition Run/Start relay.
3. Turn the ignition on.
4. Using a 12-volt test light connected to ground, check the (F946) Ignition Run/Start circuit at the TCM C1 harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Replace the Ignition Run/Start Relay in accordance with the Service Information.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to AS69RC TRANSMISSION VERIFICATION TEST .
  No
  - Go To 7
CHECK THE (F946) IGNITION RUN/START CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the PDC C3 harness connector.
3. Measure the resistance of the (F946) Ignition Run/Start circuit between the TCM C1 harness connector and the PDC C3 harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 8
  No
  - Repair the (F946) Ignition Run/Start circuit for an open.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to AS69RC TRANSMISSION VERIFICATION TEST .
CHECK THE (F946) IGNITION RUN/START CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (F946) Ignition Run/Start circuit at the PDC C3 harness connector.
  Is there continuity between ground and the (F946) Ignition Run/Start circuit?
  
  Yes
  - Repair the (F946) Ignition Run/Start circuit for a short to ground.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to AS69RC TRANSMISSION VERIFICATION TEST .
  No
  - Go To 9
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all TCM 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 TCM 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 Event 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 TCM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Transmission Control Module (TCM) in accordance with the Service information. Refer to MODULE, TRANSMISSION CONTROL, REMOVAL .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to AS69RC TRANSMISSION VERIFICATION TEST .
  No
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to AS69RC TRANSMISSION VERIFICATION TEST .
  - Test complete.
CHECK WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Wiggle the wires while checking for shorted and open circuits.
4. Check for any Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to AS69RC TRANSMISSION VERIFICATION TEST .
  No
  - Test complete.