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.

U010E ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, read DTCs.
  Is the DTC Active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION - 6.7L diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
OTHER DTCS
NOTE:
Repair any Voltage Low DTCs before proceeding with this test procedure.

NOTE:
The J1939 Datalink is a BUS circuit which the PCM uses to communicate with the Turbo Actuator, DEF Dosing Control Unit, NOx Sensor 1/1, Nox Sensor 1/2 and NH3 Sensor. If the J1939 Datalink is shorted or one of these components is internally shorted, communication will be lost and DTCs will set against ALL of these components.

Are there lost communication DTCs present against All of the components listed in the note above?

Yes
- Go To 8
No
- Go To 3
CHECK THE DEF DCU CONNECTOR FOR CORROSION OR FOREIGN MATERIAL
1. Turn the ignition on.
2. With the scan tool, record all Freeze frame data.
3. With the scan tool, erase DTCs.
4. Disconnect the DEF Dosing Control Unit C1 harness connector.
  NOTE:
  Check connectors for corrosion or foreign materials- Clean/repair as necessary.
5. Reconnect the DEF Dosing Control Unit C1 harness connector.
6. Test drive the vehicle for an extended amount of time.
  Did the DTC return?
  
  Yes
  - Go To 4
  No
  - Repair is complete.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (A969) FUSED BATTERY SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the DEF Dosing Control Unit C1 harness connector.
  NOTE:
  Check connectors - Clean/repair as necessary.
3. Measure the voltage of the (A969) Fused Battery Supply circuit at the DEF Dosing Control Unit C1 harness connector.
  NOTE:
  Check the voltage at key-on and during engine cranking.
  
  Is the voltage within 1.0 volt of battery voltage?
  
  Yes
  - Go To 5
  No
  - Using the wiring diagram as a guide, repair the (A969) Fused Battery Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (K970) DCU WAKE-UP SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Turn the ignition off.
2. Measure the voltage of the (K970) DCU Wake-up Signal circuit at the DEF Dosing Control Unit C1 harness connector.
  NOTE:
  Check the voltage at key-on and during engine cranking.
  
  Is the voltage within 1.0 volt of battery voltage?
  
  Yes
  - Go To 6
  No
  - Using the wiring diagram as a guide, repair the (K970) DCU Wake-up Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (Z914) DEF DOSING CONTROL UNIT GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Turn the ignition off.
2. Measure the resistance between ground and the (Z914) DEF Dosing Control Ground circuits at the DEF Dosing Control Unit C1 harness connector.
  Is the resistance below 5.0 Ohms for the ground circuit?
  
  Yes
  - Go To 7
  No
  - Using the wiring diagram as a guide, repair the (Z914) DEF Dosing Control Unit Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE J1939 DATALINK CIRCUITS FOR AN OPEN/HIGH RESISTANCE
1. Disconnect the Turbo Actuator harness connector.
2. Disconnect the NOx Sensor Module 1/2 harness connector.
3. Disconnect the NH3 Sensor Module harness connector.
4. Disconnect the PCM C2 harness connector.
  NOTE:
  Check connectors - Clean/repair as necessary.
5. Measure the resistance of the (D134) J1939 Datalink (+) circuit between the DEF Dosing Control Unit C2 harness connector and the PCM C2 harness connector.
6. Measure the resistance of the (D135) J1939 Datalink (-) circuit between the DEF Dosing Control Unit C2 harness connector and the PCM C2 harness connector.
  Is the resistance below 5.0 Ohms for both circuits?
  
  Yes
  - Replace the DEF Dosing Control Unit in accordance with the service information. Refer to UNIT, DIESEL EXHAUST FLUID DOSING CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Repair the J1939 circuit that measured above 5.0 Ohms for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE COMPONENTS ON THE J1939 DATALINK
NOTE:
Disconnect only one component at a time during this next step. If the DTCs for the components that are STILL CONNECTED change from active to stored, the component that was disconnected is faulty. If all of the DTCs remain active, then the disconnected component is not the problem. Reconnect each component before going on to the next one so that only one component is disconnected at a time.
1. Turn the ignition off.
2. Disconnect the Turbo Actuator harness connector. Cycle the ignition key on and off 3 times ending with the ignition on. Leave the ignition in the off position for 75 seconds each time.
  NOTE:
  Monitor the status of the DTCs for the remaining connected components with the scan tool.
3. Turn the ignition off and reconnect the Turbo Actuator harness connector.
4. Disconnect the NOx Sensor Module 1/2 harness connector. Cycle the ignition key on and off 3 times ending with the ignition on. Leave the ignition in the off position for 75 seconds each time.
  NOTE:
  Monitor the status of the DTCs for the remaining connected components with the scan tool.
5. Turn the ignition off and reconnect the NOx Sensor Module 1/2 harness connector.
6. Disconnect the NH3 Sensor harness connector. Cycle the ignition key on and off 3 times ending with the ignition on. Leave the ignition in the off position for 75 seconds each time.
  NOTE:
  Monitor the status of the DTCs for the remaining connected components with the scan tool.
7. Turn the ignition off and reconnect the NH3 Sensor harness connector.
  Did the status of the DTCs change to stored for the components STILL CONNECTED when disconnecting any one of the components listed above?
  
  Yes
  - Replace the component that caused the DTC change from active to stored in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 9
CHECK THE J1939 DATALINK CIRCUITS FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the Turbo Actuator, NOx Sensor Module 1/2, DEF Dosing Control Unit, NH3 Sensor and the PCM C2 harness connectors.
3. Measure the resistance between ground and the (D134) J1939 Datalink (+) circuit at the PCM C2 harness connector.
4. Measure the resistance between ground and the (D135) J1939 Datalink (-) circuit at the PCM C2 harness connector.
  Is the resistance above 10k Ohms for both circuits?
  
  Yes
  - Go To 10
  No
  - Repair the J1939 circuit that measured below 10k Ohms for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE J1939 DATALINK CIRCUITS FOR A SHORT
1. Measure the resistance between the (D134) J1939 Datalink (+) circuit at the PCM C2 harness connector and all other circuits in the PCM C2 harness connector.
2. Measure the resistance between the (D135) J1939 Datalink (-) circuit at the PCM C2 harness connector and all other circuits in the PCM C2 harness connector.
  NOTE:
  Disregard any resistance between 50 and 70 Ohms between the J1939 (+) and the J1939 Datalink (-) pins.
  
  Is the resistance above 10k Ohms for both measurements?
  
  Yes
  - Go To 11
  No
  - Repair the J1939 circuit for a short circuit.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE J1939 DATALINK CIRCUITS FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (D134) J1939 Datalink (+) circuit between the DEF Dosing Control Unit C2 harness connector and the PCM C2 harness connector.
2. Measure the resistance of the (D135) J1939 Datalink (-) circuit between the DEF Dosing Control Unit C2 harness connector and the PCM C2 harness connector.
  Is the resistance below 5.0 Ohms for both circuits?
  
  Yes
  - 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 .
  No
  - Repair the J1939 circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .