Diagnostic Test

WARNING: This page is about a different car, the 2012 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 +/- 2 lb/min?
  
  Yes
  - Go To 2.
  No
  - Replace the Mass Air Flow Sensor in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE EGR AIR FLOW CONTROL VALVE
1. Verify operation of the EGR Air Flow Control Valve.
  NOTE:
  Repair any EGR Air Flow Control Valve DTCs that are present before continuing.
  
  Does the EGR Air Flow Control Valve operate normally?
  
  Yes
  - Go To 3.
  No
  - Perform the appropriate repair.
  - Perform the POWERTRAIN VERIFICATION 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 - 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 - 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 - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 6.
CHECK THE EGR COOLER BYPASS CONTROL VALVE
1. Verify operation of the EGR Cooler Bypass Control Valve.
  NOTE:
  Repair any EGR Cooler Bypass Control Valve DTCs that are present before continuing.
  
  Does the EGR Cooler Bypass Control Valve operate normally?
  
  Yes
  - Go To 7.
  No
  - Perform the appropriate repair.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE FUEL DELIVERY SYSTEM
1. Perform the CHECKING THE FUEL DELIVERY SYSTEM diagnostic procedure. Refer to DIAGNOSIS AND TESTING, 6.7L .
  Were any problems found with the fuel system?
  
  Yes
  - Perform the appropriate repair.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 8.
CHECK FOR EGR COOLER FOULING
1. Remove and inspect the EGR Cooler for excessive soot fouling.
  Was the EGR Cooler found to be fouled?
  
  Yes
  - Clean the EGR Cooler with approved Mopar EGR System cleaner. Determine the root cause of the excessive soot build up.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 9.
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 - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Repair cause of high Fuel Injector leakage.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .