Overview
| CODE | REASON | EFFECT |
| Fault Code: 3229 PID: SPN: 4360 FMI: 0/0 LAMP: Red SRT: |
The selective catalytic reduction (SCR) intake temperature sensor reading has exceeded the maximum temperature limit.
|
Possible reduced engine performance. |
Circuit Description
The selective catalytic reduction (SCR) intake temperature sensor is used by the engine control module (ECM) to monitor the engine exhaust temperature entering the SCR catalyst. The ECM monitors the voltage on the signal pin and converts this to a temperature value.
Component Location
The SCR intake temperature sensor is located in the aftertreatment system. It is located between the diesel particulate filter and the SCR catalyst in the exhaust system.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is running.
Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the temperature at the SCR catalyst intake temperature sensor was greater than 800°C [1472°F] for more than 20 seconds.
Action Taken When the Fault Code is Active
The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.
The engine will be shut down if the Engine Protection Shutdown feature is enabled.
- Diesel exhaust fluid injection into the aftertreatment system is disabled.
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 red STOP ENGINE lamp immediately after the diagnostic runs and passes.
- For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after four 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
This fault will go inactive immediately after the SCR intake temperature drops below the warning limit, and will likely be inactive at the time of diagnosis. For these reasons this troubleshooting tree must be used for both active and inactive fault codes.
Possible causes of this fault code include:
Degraded, diluted, or incorrect diesel exhaust fluid
Malfunctioning in-range SCR intake temperature sensor
Upstream exhaust system malfunction.
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.
For intermittent power supply and datalink 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.
Troubleshooting Summary
- Check for primary fault codes
- Aftertreatment diesel exhaust fluid is contaminated
- Aftertreatment SCR temperature sensor module is malfunctioning
- Aftertreatment SCR temperature sensor module pin to pin short circuit check
- Aftertreatment Fuel Injector Leak Test
- Aftertreatment DOC is malfunctioning
- ECM calibration revision history check
Solution: S00001537
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:
- Aftertreatment SCR: 3142, 3143, 3144, 3145, 3146, 3147, 3148, 3149
Linked Solutions
- None
Repair
- Perform a search on the appropriate fault codes.
Validation
- None
Solution: S00000563
Verification
Conditions
- Turn keyswitch OFF.
Action
- Inspect the aftertreatment diesel exhaust fluid in the tank for signs of debris or contamination.
- Use a diesel exhaust fluid refractometer to measure the concentration of the diesel exhaust fluid in the tank.
Specification
- If there are signs of contaminates in the aftertreatment diesel exhaust fluid, then proceed to the Repair section.
Linked Solutions
- None
Repair
- Drain the diesel exhaust fluid tank, clean thoroughly and refill with pure diesel exhaust fluid.
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: S00002957
Verification
Conditions
- Turn keyswitch ON.
- Connect the recommended Cummins® electronic service tool or equivalent.
Action
- Run the engine at idle for the following minutes: 10
- Monitor the aftertreatment SCR outlet temperature sensor.
- Monitor the aftertreatment SCR intake temperature sensor.
Specification
- Proceed to the Linked Solutions section if the aftertreatment SCR temperature sensors vary by more than the following: 24°C (43°F)
- Proceed to the next solution if the aftertreatment SCR temperature sensors do not vary by more than the following: 24°C (43°F)
Linked Solutions
Click on the link below:
- Aftertreatment SCR temperature sensor module pin to pin short circuit check
Repair
Repair or replace only the components that were found to be out of specification.
- Troubleshoot the OEM wiring harness, engine wiring harness, and all interconnects.
- Repair or replace the OEM wiring harness.
- Repair or replace the engine wiring harness.
Validation
- 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.
- Connect all components
- Connect the recommended Cummins® electronic service tool or equivalent.
- 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.
Solution: S00002960
Verification
Conditions
- Turn keyswitch OFF.
- Disconnect the aftertreatment SCR temperature sensor module from the OEM wiring harness.
- Disconnect the aftertreatment SCR outlet temperature sensor from the aftertreatment SCR temperature sensor module.
- Disconnect the aftertreatment SCR intake temperature sensor from the aftertreatment SCR temperature sensor module.
Action
- Inspect the pins and connectors for damage.
- Measure the resistance of each circuit contained within the aftertreatment SCR temperature sensor module.
- Refer to the circuit diagram or wiring diagram for connector pin identification.
Specification
- Proceed to the Repair section if the resistance is less than the following specification: 100k Ω
Linked Solutions
- None
Repair
Repair or replace only the components that were found to be out of specification.
- Replace the aftertreatment SCR temperature sensor module.
- Replace aftertreatment SCR intake temperature sensor.
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: S00003332
Verification
Conditions
- Turn keyswitch ON.
- Connect the recommended Cummins® electronic service tool or equivalent.
Action
- Run the engine at idle.
- Perform the Aftertreatment Fuel Injector Leak Test.
Specification
- If the Aftertreatment Fuel Injector Leak 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 Snap Acceleration – Aftertreatment Connected Test.
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: S00000443
Verification
Conditions
- Connect all components.
- 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.
- 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 revision listed in the ECM calibration revision history for applicable changes.
Specification
- If a calibration update for this fault code is available, the ECM calibration revision must be that revision or higher.
Linked Solutions
- None
Repair
- Prior to downloading the ECM calibration, check to see that all job images and all other troubleshooting has been documented as downloading an ECM calibration will remove the fault codes on the ECM.
- Download the updated ECM calibration code.
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.