On Board Diagnosis (OBD) Monitor Readiness – 2011-2012 Ram Truck 3500 4500 5500

NUMBER: 25-005-15
GROUP: Emissions Control
DATE: October 23, 2015

 

THIS BULLETIN SUPERSEDES SERVICE BULLETIN 25-003-11, DATED DECEMBER 06, 2011, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDE REVISED NOTE ABOUT UPDATED SCAN TOOL INFORMATION AND VERBIAGE WITHIN THE STEPS.

**THE wiTECH SOFTWARE IS REQUIRED TO BE AT THE LATEST RELEASE BEFORE PERFORMING THIS PROCEDURE.**

 

SUBJECT:

On Board Diagnosis (OBD) Monitor Readiness

 

MODELS:

2011 – 2012 (DD) Ram Truck (3500 Cab Chassis)
2011 – 2012 (DP) Ram Truck (4500/5500 Cab Chassis)

 

NOTE: This bulletin applies to DD/DP vehicles equipped with a 6.7L Cummins engine (sales code ETJ).

 

DISCUSSION:

Vehicles that fail to pass a state mandated emissions inspection may have certain OBD readiness monitors that have NOT completely run. Anytime an ECM/PCM has been replaced or flashed, the OBD readiness monitors may need to run again to complete the monitoring process. This bulletin describes the necessary steps required to run each monitor.

Customers may be required to drive the vehicle for an extended period of time in a variety of driving styles to allow all of the OBD Monitors to run.

NOTE: **The names in brackets are the names that can be found on the wiTECH under PCM Misc Function Menu CARB Readiness Status.**

 

1). Misfire Monitor [Misfire **Monitor**];

The following conditions must be met:

  • Fuel level greater than 25 percent.
  • Battery voltage must be between 11 and 16 volts.
  • PTO or idle-up not engaged.
  • Final Aftertreatment Operating Mode is Normal.
  • Coolant temperature must be over 140°F (60°C).

To run the monitor:

 

2). Fuel System Monitor [**Fuel System Monitor**];

The following conditions must be met:

  • Fuel level greater than 25 percent.
  • Battery voltage must be between 11 and 16 volts.
  • PTO or idle-up not engaged.
  • Final Aftertreatment Operating Mode is Normal.
  • Coolant temperature must be over 140°F (60°C).
  • Grid heater is off.

To run the monitor:

  • Let the vehicle idle for a minimum of 2 minutes with the above conditions met.
  • Drive the vehicle at highway speeds. Perform a zero fueling event (Decelerate condition for 10 seconds, with foot off of accelerator pedal). Repeat 10-15 times.

 

3). Boost System Monitor [**Boost Pressure System Monitor**];

The following conditions must be met:

  • Engine must be running for 10 minutes.
  • VGT Compressor Inlet Air Temp must be below 122°F (50°C).
  • Mass Airflow must be above 2 kg/min.
  • PTO not engaged.
  • Ambient Air Temperature must be above 20°F (-7°C).
  • Final Aftertreatment Operating Mode is Normal.
  • Coolant temperature must be over 140°F (60°C).

To run the monitor:

–      Drive the vehicle on the highway. Perform a boost event (sudden depression of the accelerator pedal to provide turbocharger boost to the system). Repeat 15-20 times.

 

4). EGR System Monitor [EGR **and/or VVT System Monitor**];

The following conditions must be met:

  • Coolant temperature must be over 140°F (60°C).
  • EGR Flow reading is above 0.75 kg/min.
  • PTO not engaged.
  • Final Aftertreatment Operating Mode is Normal.

To run the monitor:

–         Drive the vehicle on the highway for 20-25 minutes.

 

5). Exhaust Gas Sensor (EGS) Monitor [**Exhaust Gas Sensor Monitor**];

The following conditions must be met:

  • PTO not engaged.
  • Coolant temperature must be over 180°F (80°C) for more than 1 minute.

To run the monitor:

  • Drive the vehicle on the highway with the Final Aftertreatment Operating Mode in Normal Mode. Perform a zero fueling event (Decelerate condition for 10 seconds, with foot off of accelerator pedal). When accelerating gradually depress the accelerator pedal (Do not depress the accelerator pedal suddenly). Repeat 15-20 times.
  • The vehicle will then need to complete four DeSoots. These DeSoots do not need to be completed in one drive cycle.

 

6). NMHC System Monitor [**NMHC Catalyst Monitor**];

The following conditions must be met:

  • Coolant temperature must be over 140°F (60°C).
  • Final Aftertreatment Operating Mode is DeSoot.
  • PTO not engaged.

To run the monitor:

–      Drive the vehicle on the highway for 12-15 minutes at steady state. After the 12-15 minutes of highway driving, exit the highway and proceed to a parking lot. Once in the parking lot come to a complete stop for 5 minutes. Repeat this if the truck is still in DeSoot.

 

7). Particulate Matter (PM) Filter System Monitor [**PM Filter Monitor**];

The following conditions must be met:

  • Exhaust Gas Temp Sensor 2 reading is above 302°F (150°C).
  • Inlet Air Pressure reading at idle is above 75 kPa (11 psi).
  • Soot Filter Delta Pressure reading is below 200 kPa (29 psi).
  • Coolant temperature must be over 140°F (60°C).
  • PTO not engaged.

To run the monitor:

  • This monitor requires a minimum of two DeSoots to complete the diagnostics.
  • Drive the vehicle on the highway until the truck goes into DeSoot and continue to drive on the highway for 45 minutes. The truck will then need to complete a second DeSoot. Once the Second DeSoot completes, drive the truck for 15 minutes. The DeSoots do not need to be completed in the same drive cycle.

NOTE: City driving or a stop and go driving style generally produces more soot and will enable the truck to achieve soot levels in the DPF that require a DeSoot the quickest.

 

8). NOx Aftertreatment System Monitor [**NOx/SCR Aftertreatment Monitor**];

The following conditions must be met:

  • Inlet Air Pressure reading is above 80 kPa (11 psi) and below 160 kPa (23 psi).
  • Intake Air Temperature Degrees is above 21°F (-6°C).
  • A minimum of 1 gallon of Diesel Exhaust Fluid (DEF) has been added to the tank.
  • Coolant temperature must be over 140°F (60°C).
  • PTO not engaged.
  • Final Aftertreatment Operating Mode is Normal.

To run the monitor:

  • Drive the vehicle (preferably on the highway to allow for a nonstop drive cycle) keeping the engine RPMs between 2000 – 2250 RPMs.

 

9). Comprehensive Component Monitor (CCM) [Comprehensive Component **Monitor**];

To run the monitor:

  • This monitor runs almost immediately at engine start. If it does not run, completely power down and restart the engine.

 

POLICY:

Information Only

NOTE: **When all repairs are completed, the Mileage Out is noted and the RO is returned to dispatch/Service Advisor.**


 

25-005-15

 


 

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Last update on 2022-08-14 / Affiliate links / Images from Amazon Product Advertising API

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