Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

CHECK FOR OTHER DTCs
1. Ignition on, engine not running.
2. With the scan tool, read DTCs and record on the repair order.
  Are any other DTCs Active?
  
  Yes
  - Repair other DTCs before proceeding.
  No
  - Go To 2
CHECK FOR THE AFTERTREATMENT DOC MISSING
1. Check the exhaust system to see if the Diesel Oxidation Catalyst (DOC) has been removed.
  Is the DOC present in the system?
  
  Yes
  - Go To 3
  No
  - Replace the Diesel Oxidation Catalyst (DOC) in accordance with the service information. Refer to FILTER, DIESEL PARTICULATE, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
CHECK FOR EXHAUST GAS TEMPERATURE SENSOR 2 AND EXHAUST GAS TEMPERATURE SENSOR CATALYST HARNESS CONNECTORS REVERSED
NOTE:
Exhaust Gas Temperature Sensor (EGT) 2 is located at the DOC inlet and Exhaust Gas Temperature Sensor (EGT) Catalyst is located at the DOC outlet (Between the DOC and the DPF).
1. Turn the ignition off.
2. Disconnect the EGT 2 harness connector.
3. Turn the ignition on.
4. Using the scan tool, monitor the voltage reading of EGT Sensor 2 and EGT Sensor Catalyst.
  Does the Diesel voltage value change to 5.0 volts for EGT Sensor 2 or EGT Sensor Catalyst?
  
  EGT Sensor 2
  - Go To 4
  EGT Sensor Catalyst
  - The harness connectors are reversed. Switch the (EGT 2 and EGT Catalyst) harness connectors to the correct sensors.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
CHECK FOR AN EXHAUST LEAK
1. Perform the CHECKING THE EXHAUST SYSTEM FOR LEAKS diagnostic procedure. Refer to DIAGNOSIS AND TESTING .
  Are leaks found?
  
  Yes
  - Repair or replace as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 5
CHECK THE EXHAUST TEMPERATURE
1. Connect all EGT sensors.
2. Turn the ignition on.
3. Run the engine to normal operating temperature.
4. With the scan tool, read the Exhaust Temperature Sensors to determine the exhaust temperature.
  Is the temperature reading above 225°F?
  
  Yes
  - Go To 6
  No
  - Go To 7
COMPARE THE RATIONALITY OF THE EXHAUST TEMPERATURE SENSORS
1. Start the engine.
2. Raise the engine speed to 2500 RPM for two minutes.
  Does the temperature readings of all three Exhaust Temperature Sensors change in value at least 5°F?
  
  Yes
  - Go To 9
  No
  - Replace the Exhaust Temperature Sensor that did not change in value by at least 5°F or is not updating.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
CHECK THE OPERATION OF THE EXHAUST TEMPERATURE SENSORS
1. Start the engine and allow it to idle for 10 minutes.
2. With the scan tool, read the values of all three Exhaust Temperature Sensors.
  Do all three temperature sensors read above 150°F and are the values of the temperature sensors updating?
  
  Yes
  - Go To 8
  No
  - Replace the Exhaust Temperature Sensor that is not above 150°F or is not updating on the scan tool.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
CHECK THE FUEL DELIVERY SYSTEM
1. Perform the CHECKING THE FUEL DELIVERY SYSTEM diagnostic procedure. Refer to CHECKING THE FUEL DELIVERY SYSTEM .
  Were any problems found?
  
  Yes
  - Perform the appropriate repair in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 9
CHECK THE CHARGE AIR COOLING (CAC) SYSTEM FOR CONTAMINATION DAMAGING THE AFTERTREATMENT DOC
1. Separate the exhaust plumbing from the Turbocharger outlet.
2. Inspect for signs of oil, coolant or fuel being introduced into the aftertreatment system from the engine or signs of moisture in the Turbocharger exhaust outlet.
  Is contamination found in the turbocharger exhaust outlet?
  
  Yes
  - Identify and repair the source of the contamination within the engine and replace the Aftertreatment Diesel Oxidation Catalyst (DOC) after the engine failure has been repaired. Refer to FILTER, DIESEL PARTICULATE, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 10
CHECK AFTERTREATMENT DOC, AFTERTREATMENT DPF, AND ALL EXHAUST GAS TEMPERATURE SENSORS FOR FACE PLUGGING
1. Remove the Aftertreatment DOC, Aftertreatment DPF and all 4 EGT sensors to inspect for damage or presence of face plugging.
  Are the components found to be missing, plugged or damaged during the inspection of the Aftertreatment DOC, Aftertreatment DPF, and all 4 EGT sensors?
  
  Yes
  - Replace or repair damaged component(s). Refer to FILTER, DIESEL PARTICULATE, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .