Overview
| CODE | REASON | EFFECT |
| Fault Code: 3495 PID: SPN: 3711 FMI: 11/31 LAMP: Amber SRT: |
The diesel oxidation catalyst intake temperature is not high enough to actively regenerate the diesel particulate filter.
|
None on 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.
When the exhaust temperature is cold, the sensor or thermistor resistance is high. The ECM signal voltage only pulls down a small amount through the sensor to ground. Therefore, the ECM senses a high signal voltage or low temperature. When the exhaust gas temperature is hot, the sensor resistance is low. The signal voltage pulls down a large amount. Therefore, the ECM senses a low signal voltage, or a high temperature.
Component Location
The aftertreatment diesel oxidation catalyst intake temperature sensor is located in the aftertreatment system. It is located at the intake of the aftertreatment catalyst. Refer to the OEM service manual.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
Conditions for Setting the Fault Codes
The aftertreatment diesel oxidation catalyst temperature sensor module reported the aftertreatment diesel oxidation catalyst outlet temperature signal was out of range low.
Action Taken When the Fault Code is Active
- The ECM illuminates the amber CHECK ENGINE lamp and/or malfunction indicator lamp (MIL) after the diagnostic fails on two consecutive trips.
Conditions for Clearing the Fault Code
- To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
- 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 ECM will turn off the amber CHECK ENGINE lamp after the diagnostic runs and passes.
- For On-Board Diagnostics (OBD) engines, the ECM will turn off the MIL after three consecutive trips where 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
Possible causes of this fault code include:
A malfunctioning variable geometry turbocharger (VGT)
An in-range malfunction of the aftertreatment diesel oxidation catalyst intake temperature sensor
Exhaust system leaks.
Troubleshooting Summary
Solution: S00002246
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:
- Intake manifold: 122, 123, 2973
- Intake manifold temperature: 436
- Barometric pressure: 221, 222
- Ambient air temperature: 249, 256, 2398
- Aftertreatment DOC: 3313, 3314, 3315
- Aftertreatment DPF: 3316, 3317, 3318, 3319, 33321, 3322
- Turbocharger: 1898, 2387, 2449, 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: S00011203
Verification
Conditions
- Turn keyswitch OFF.
Specification
- If the exhaust restriction is not within specification, then a restriction in the exhaust has been detected.
Linked Solutions
- None
Repair
Repair or replace only the components that were found to be out of specification.
- Check the face of the aftertreatment diesel oxidation catalyst for plugging.
- Check the face of the aftertreatment diesel particulate filter for plugging.
- Check for deposits in the decomposition tube.
- Check the face of the aftertreatment SCR catalyst for plugging.
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.