Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, record all Freeze frame data.
3. With the scan tool, erase DTCs.
4. Turn the ignition off for 75 seconds.
5. Turn the ignition on.
6. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK THE (K31) FUEL LIFT PUMP CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Disconnect the PDC C3 harness connector.
4. Measure the resistance between ground and the (K31) Fuel Lift Pump Control circuit at the PCM C2 harness connector.
  Is the resistance below 10k Ohms?
  
  Yes
  - Repair the (K31) Fuel Lift Pump Control circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 3
CHECK THE (K31) FUEL LIFT PUMP CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (K31) Fuel Lift Pump Control circuit between the PCM C2 harness connector and the PDC C3 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (K31) Fuel Lift Pump Control circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 4
POWERTRAIN CONTROL MODULE
1. Reconnect the PCM C2 and PDC C3 harness connectors.
2. Using a back probing tool, back probe the (K31) Fuel Lift Pump Control circuit at the PDC C3 harness connector.
3. Turn the ignition on.
4. With the scan tool toggle the Fuel Lift Pump actuator.
5. Using a 12-volt test light connected to 12 Volts, probe the (K31) Fuel Lift Pump Control circuit at the PDC C3 harness connector.
  NOTE:
  The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
  
  Does the test light cycle on and off brightly?
  
  Yes
  - Replace the Power Distribution Center (PDC) in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - 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 .