Overview
| CODE | REASON | EFFECT |
| Fault Code: 2637 PID: S380 SPN: 5018 FMI: 11/11 LAMP: None SRT: |
The front face of the aftertreatment diesel oxidation catalyst has been detected to be plugged with soot.
|
Possible reduced engine performance. |
Circuit Description
The aftertreatment temperature sensors are used by the engine control module (ECM) to monitor the engine exhaust temperatures in the aftertreatment system. The aftertreatment temperature sensors are thermistors and change resistance based on the temperature being measured. The ECM provides a 5 volt reference voltage to the sensor. The ECM monitors the change in signal voltage and converts this to a temperature value.
Component Location
The aftertreatment diesel oxidation catalyst is located in the exhaust system. The location of the catalyst can vary, depending on the original equipment manufacturer (OEM). Refer to the OEM service manual.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is running and active regeneration of the aftertreatment diesel particulate filter is occurring.
Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the intake face of the diesel oxidation catalyst was plugged with soot.
Action Taken When the Fault Code is Active
- The ECM logs the fault code immediately when the diagnostic runs and fails.
Active and stationary regeneration of the diesel particulate filter will be disabled.
Exhaust gas recirculation (EGR) valve operation will be disabled.
Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.
Conditions for Clearing the Fault Code
- Perform the recommended Cummins® electronic service tool or equivalent Diesel Oxidation Catalyst Maintenance Reset procedure found under the Aftertreatment Maintenance section of Advanced ECM Data.
- The fault code status displayed by the recommended Cummins® electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes.
- The “Reset All Faults” command in the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.
Shop Talk
This fault code is set when the inlet face of the diesel oxidation catalyst is detected to be plugged with soot.
Possible causes of this fault code include:
Engine oil or fuel plugging the front face of the aftertreatment diesel oxidation catalyst.
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.
For intermittent power supply and data link communication issues with aftertreatment components, it is highly recommended that the OEM Power Distribution Center fuses and relays be thoroughly checked for loose, missing, or intermittent connections.
NOTE: This fault code is only used to assist in troubleshooting Fault Codes 3151, 3543, and/or 3582.
Troubleshooting Summary
Solution: S00001696
Verification
Conditions
- Turn keyswitch ON.
- Connect the recommended Cummins® electronic service tool or equivalent.
Action
- Use the recommended Cummins® electronic service tool or equivalent to read the fault codes.
Specification
Before troubleshooting this fault code, troubleshoot any fault code that is active or has more than one inactive count within the last 25 engine operating hours from the following list:
- EGR: 1228, 1867, 1896, 1961, 2272, 2349, 2353, 2357, 2375, 2376, 2961, 2962, 3136, 3137, 3138, 3342, 3382, 3383, 3389
- EGR differential pressure: 1866, 2273, 2274
- Turbocharger: 1898, 1962, 2198, ,2288, 2346, 2347, 2387, 2449, 2451, 2634, 2635, 2636, 3348, 3616
Linked Solutions
- None
Repair
- Perform a search on the appropriate fault codes.
Validation
- None
Solution: S00008386
Verification
Conditions
- Turn keyswitch OFF.
Specification
- If a leak is found, then proceed to the Repair section.
Linked Solutions
- None
Repair
- Repair or replace the leaking components.
Refer to OEM Service Manual
Validation
- Connect all components
- Connect the recommended Cummins® electronic service tool or equivalent.
- Disable the fault code.
- Operate the engine within the «Conditions for Clearing the Fault Code» found in the Overview section of the troubleshooting procedure.
- Verify that the fault code is no longer active.
- Check ECM Calibration Revision History
- Use the recommended Cummins® electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration Revision History Database for applicable changes related to this fault code.
- Refer to ECM Calibration Revision History Database.
Solution: S00001008
Verification
Conditions
- Engine running.
Action
- Visually inspect for leaks in the exhaust manifold to head.
- Visually inspect for leaks from the turbocharger to exhaust manifold.
- Visually inspect for leaks in the exhaust plumbing between the turbocharger outlet and the Aftertreatment DOC intake connection.
- Visually inspect the exhaust piping for leaks, cracks, and loose connections.
- Inspect for leaks at the aftertreatment DOC housing, sensor ports and connection points.
- Visually inspect the aftertreatment and SCR components for exhaust leaks.
Specification
- If there is any damage or leaks found in the exhaust system, then proceed to the Repair section.
Linked Solutions
- None
Repair
Repair or replace only the components that were found to be out of specification.
- Replace the exhaust manifold.
- Repair or replace the exhaust plumbing.
Refer to OEM Service Manual
- Replace aftertreatment DOC.
- Replace the aftertreatment diesel particulate filter.
- Replace the aftertreatment SCR Catalyst.
Validation
- Connect all components
- Connect the recommended Cummins® electronic service tool or equivalent.
- Disable the fault code.
- Operate the engine within the «Conditions for Clearing the Fault Code» found in the Overview section of the troubleshooting procedure.
- Verify that the fault code is no longer active.
- Check ECM Calibration Revision History
- Use the recommended Cummins® electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration Revision History Database for applicable changes related to this fault code.
- Refer to ECM Calibration Revision History Database.
Solution: S00008815
Verification
Conditions
- Turn keyswitch OFF.
Specification
- If a leak is found, then proceed to the Repair section.
Linked Solutions
- None
Repair
Repair or replace only the components that were found to be out of specification.
- Repair or replace the charge air cooler.
- Repair or replace the charge air cooler hoses.
Refer to OEM Service Manual
Validation
- Connect all components
- Connect the recommended Cummins® electronic service tool or equivalent.
- Disable the fault code.
- Operate the engine within the «Conditions for Clearing the Fault Code» found in the Overview section of the troubleshooting procedure.
- Verify that the fault code is no longer active.
- Check ECM Calibration Revision History
- Use the recommended Cummins® electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration Revision History Database for applicable changes related to this fault code.
- Refer to ECM Calibration Revision History Database.
Solution: S00003257
Verification
Conditions
- Turn keyswitch ON.
- Connect the recommended Cummins® electronic service tool or equivalent.
Action
- Use the recommended Cummins® electronic service tool or equivalent.
- Perform the Aftertreatment Maintenance Reset All procedure found under the Aftertreatment Maintenance Section of Advanced ECM Data.
Performing the Aftertreatment Maintenance Reset All may cause the fault code to go inactive. This does not mean that the issue was resolved, only that the efficiencies were reset. Troubleshooting must be continued.
- Perform the Aftertreatment Fuel Injector Flow Test.
Specification
- If the Aftertreatment Fuel Injector Flow Test does not meet specification, then a malfunctioning aftertreatment fuel injector has been detected.
Linked Solutions
- None
Repair
- Clean or replace the aftertreatment fuel injector.
- Perform the Aftertreatment Stationary Regeneration procedure.
Validation
- Connect all components
- Connect the recommended Cummins® electronic service tool or equivalent.
- Disable the fault code.
- Operate the engine within the «Conditions for Clearing the Fault Code» found in the Overview section of the troubleshooting procedure.
- Verify that the fault code is no longer active.
- Check ECM Calibration Revision History
- Use the recommended Cummins® electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration Revision History Database for applicable changes related to this fault code.
- Refer to ECM Calibration Revision History Database.
Solution: S00000761
Verification
Conditions
- Turn keyswitch OFF.
Action
- Visually inspect for the presence of the aftertreatment DOC.
- Inspect the inlet face of the aftertreatment DOC for reuse.
Refer to Service Bulletin 4021600
- Inspect for cracks in the aftertreatment DOC cell walls.
Refer to Service Bulletin 4021600
- Inspect for soot or oil plugging the front face of the catalyst
Specification
- If plugging or damage is found, then proceed to the Repair section.
- If the face of the aftertreatment diesel oxidation catalyst is cracked or damaged, then proceed to Repair section.
Linked Solutions
- None
Repair
Repair or replace only the components that were found to be out of specification.
- If the face of the aftertreatment DOC is plugged, then clean the aftertreatment DOC.
- If the face of the aftertreatment DOC is cracked or damaged, then replace the aftertreatment DOC.
Validation
- Connect all components
- Connect the recommended Cummins® electronic service tool or equivalent.
- Disable the fault code.
- Operate the engine within the «Conditions for Clearing the Fault Code» found in the Overview section of the troubleshooting procedure.
- Verify that the fault code is no longer active.
- Check ECM Calibration Revision History
- Use the recommended Cummins® electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration Revision History Database for applicable changes related to this fault code.
- Refer to ECM Calibration Revision History Database.
Solution: S00003148
Verification
Conditions
- Turn keyswitch ON.
- Connect the recommended Cummins® electronic service tool or equivalent.
Action
- Use the recommended Cummins® electronic service tool or equivalent to read the fault codes.
- Check to make sure no other fault codes are active.
Specification
- If other fault codes that inhibit the aftertreatment stationary regeneration are active or inactive with more than one count within the last 25 engine operating hours, then troubleshoot those fault codes before performing the aftertreatment stationary regeneration procedure.
- If there are no other fault codes active or inactive with more than one count within the last 25 engine operating hours that inhibit the aftertreatment stationary regeneration, then proceed directly to performing the aftertreatment stationary regeneration.
Linked Solutions
- None
Repair
- Inform the customer on the proper procedure for initiating a stationary regeneration.
- Some vehicles can be equipped with a stationary regeneration switch in the dash. This switch can also be used to perform the stationary regeneration procedure. Refer to the manufacturer’s operating instructions.
Validation
- Connect all components
- Connect the recommended Cummins® electronic service tool or equivalent.
- Disable the fault code.
- Operate the engine within the «Conditions for Clearing the Fault Code» found in the Overview section of the troubleshooting procedure.
- Verify that the fault code is no longer active.
- Check ECM Calibration Revision History
- Use the recommended Cummins® electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration Revision History Database for applicable changes related to this fault code.
- Refer to ECM Calibration Revision History Database.
If all steps have been completed and no root cause has been identified, then follow the technical escalation process.