Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

If there are any DTCs present for the MAF Sensor, EGR Valve, EGR Airflow Control Valve, or EGR Cooler Bypass Valve, repair those DTCs before proceeding.

CHECK THE MAF SENSOR
1. Ignition on, engine not running.
2. With the scan tool in Sensors, read the Mass Air Flow sensor.
  Does the Mass Air Flow sensor read 0 +/- 2lb/min?
  
  Yes
  - Go To 2.
  No
  - Replace the Mass Air Flow Sensor in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE EGR AIRFLOW THROTTLE CONTROL VALVE
1. Remove the boot from the EGR Airflow Throttle Control Valve.
2. Using a mirror, look at the butterfly valve on the inside of the EGR Airflow Throttle Control Valve.
3. Start the vehicle, let idle for 10 seconds.
4. Turn the ignition off.
  NOTE:
  If functioning properly the EGR Airflow Throttle Control Valve will cycle closed immediately after the engine is shut down.
  
  Did the EGR Airflow Throttle Control Valve cycle closed immediately after the engine was shut down?
  
  Yes
  - Go To 3.
  No
  - Replace the EGR Airflow Throttle Control Valve in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE THERMOSTAT OUTLET
1. Remove the EGR Outlet Temperature Sensor from the thermostat outlet.
  Is the outlet free of debris?
  
  Yes
  - Go To 4.
  No
  - Remove debris from outlet.
  - Perform the POWERTRAIN VERIFICATION TEST TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK FOR EGR CROSSOVER TUBE RESTRICTION
1. Remove EGR Crossover tube from EGR Cooler and EGR Valve.
2. Inspect tube for restriction.
  Is the EGR crossover tube restricted?
  
  Yes
  - If possible, clean the tube. If not, replace the tube.
  - Perform the POWERTRAIN VERIFICATION TEST TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 5.
CHECK THE EGR VALVE
1. Check the EGR Valve for binding or excessive soot build up.
  Were any problems found?
  
  Yes
  - Clean or replace the EGR Valve in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 6.
CHECK FOR EGR COOLER FOULING
1. Remove and clean the EGR Cooler with approved Mopar EGR System cleaner.
2. Reinstall the EGR Cooler.
3. With the scan tool, erase DTCs.
4. Turn the ignition off for 75 seconds.
5. Start the engine. It may be necessary to test drive the vehicle.
  Is there a one trip fault logged against DTC P21B2?
  
  Yes
  - Replace the EGR Cooler in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 7.
CHECK THE INJECTOR RETURN FLOW
1. Perform the INJECTOR RETURN FLOW TEST. Refer to Diagnosis and Testing , 6.7L .
  Does the injector drainage meet the test specification?
  
  Yes
  - Replace the NOx Absorbing Catalyst in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Repair cause of high Fuel Injector leakage.
  - Perform the POWERTRAIN VERIFICATION TEST TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .