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.

OTHER DTCS PRESENT
1. Turn the ignition on.
2. With the scan tool, view DTCs.
  Does the P20FF, P21CB, U010E, U040F DTC display as active?
  
  Yes
  - Perform the diagnostic procedure for the other active DTCs before continuing.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 2
ACTIVE DTCS
1. Check the status of the P204F DTC.
  Is the DTC active?
  
  Yes
  - Go To 3
  No
  - Perform the INTERMITTENT CONDITION - 6.7L. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK THE (K970) DCU WAKE UP SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the DEF Dosing Control Unit C1 harness connector.
3. Disconnect the PCM C2 harness connector.
4. Measure the resistance between ground and the (K970) Wake Up Signal circuit at the DEF Dosing Control Unit C1 harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the (K970) Wake Up Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK FOR THE (K970) DCU WAKE UP SIGNAL CIRCUIT SHORTED TO ANOTHER CIRCUIT
1. Measure the resistance between the (K970) Wake Up Signal circuit and all other circuits at the DEF Dosing Control Unit C1 harness connector.
  Is the resistance above 10k Ohms between the (K970) Wake Up Signal circuit and all other circuits?
  
  Yes
  - Go To 5
  No
  - Repair the short between the (K970) Wake Up Signal circuit and the circuit that measured below 10k Ohms.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (K970) DCU WAKE UP SIGNAL CIRCUIT
1. Reconnect the PCM C2 harness connector.
2. Turn the ignition on.
3. Measure the voltage of the (K970) Wake Up Signal circuit at the DEF Dosing Control Unit C1 harness connector.
  Does the voltage measure approximately equal to battery voltage?
  
  Yes
  - Replace the DEF Dosing Control Unit 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 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 .