Overview
| CODE | REASON | EFFECT |
| Fault Code: 4167 PID: SPN: 5745 FMI: 2/2 LAMP: Amber SRT: |
The aftertreatment diesel exhaust fluid dosing unit heater temperature is irrational.
|
Diesel exhaust fluid injection into the SCR aftertreatment system is disabled. |
Circuit Description
The aftertreatment DEF dosing unit reports its internal temperature to the DEF controller via the dosing unit SIGNAL wire.The DEF controller communicates this information to the primary engine control module (ECM) via the J1939 data link network.
Component Location
The aftertreatment diesel exhaust fluid dosing unit location is original equipment manufacturer (OEM) dependent. Refer to the OEM service manual.
Conditions for Running the Diagnostics
This diagnostic runs immediately after the keyswitch is turned to the ON position, and continues until the diesel exhaust fluid dosing unit attempts to prime.
Conditions for Setting the Fault Codes
An internal error was detected in the aftertreatment diesel exhaust fluid controller, and has been communicated to the Engine Control Module (ECM) via the J1939 data link.
Action Taken When the Fault Code is Active
- The ECM illuminates the amber CHECK ENGINE lamp and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
- Diesel exhaust fluid injection into the aftertreatment system is 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
- It is necessary to use the «Reset All Faults» command in the recommended Cummins® electronic service tool or equivalent to clear this fault and extinguish the amber CHECK ENGINE lamp and/or Malfunction Indicator Lamp (MIL).
- Start the engine and let it idle. If, after the engine idles for 10 minutes, the fault code is still not active, the repair has been validated.
Shop Talk
Possible causes of this fault code include:
Malfunctioning dosing unit
- Aftertreatment DEF controller calibration is not the latest version.
Troubleshooting Summary
- Aftertreatment diesel exhaust fluid dosing unit harness open circuit check
- Aftertreatment diesel exhaust fluid controller wiring harness short to ground
- Aftertreatment diesel exhaust fluid controller wiring harness pin to pin short
- Aftertreatment diesel exhaust fluid controller software phase check
- Aftertreatment diesel exhaust fluid dosing unit is malfunctioning
Solution: S00002994
Verification
Conditions
- Turn keyswitch OFF.
- Disconnect the aftertreatment diesel exhaust fluid dosing unit from the aftertreatment diesel exhaust fluid controller wiring harness.
- Disconnect the aftertreatment diesel exhaust fluid controller wiring harness 86-pin connector from the aftertreatment diesel exhaust fluid controller.
Action
- Inspect the pins and connectors for damage.
- Measure the resistance between the aftertreatment diesel exhaust fluid dosing unit temperature SIGNAL pin at the aftertreatment diesel exhaust fluid dosing unit wiring harness connector and the aftertreatment diesel exhaust fluid dosing unit temperature SIGNAL pin of the aftertreatment diesel exhaust fluid controller wiring harness 86-pin connector.
- Measure the resistance between the aftertreatment diesel exhaust fluid dosing unit RETURN pin at the aftertreatment diesel exhaust fluid dosing unit wiring harness connector and the aftertreatment diesel exhaust fluid dosing unit RETURN pin of the aftertreatment diesel exhaust fluid controller wiring harness 86-pin connector.
- Refer to the circuit diagram or wiring diagram for connector pin identification.
Specification
- A malfunctioning OEM wiring harness has been detected if the resistance is greater than the following specification: 10 ohms
Linked Solutions
- None
Validation
- Connect all components
- Connect the recommended Cummins® electronic service tool or equivalent.
- Disable 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: S00003186
Verification
Conditions
- Turn keyswitch OFF.
- Disconnect the aftertreatment diesel exhaust fluid controller harness 86-pin connector from the aftertreatment diesel exhaust fluid controller.
- Disconnect the aftertreatment diesel exhaust fluid dosing unit from the aftertreatment diesel exhaust fluid controller harness.
Action
- Inspect the pins and connectors for damage.
- Measure the resistance between the aftertreatment diesel exhaust fluid dosing valve SIGNAL pin at the aftertreatment diesel exhaust fluid controller wiring harness 86-pin connector and ground.
- Refer to the circuit diagram or wiring diagram for connector pin identification.
Specification
- If the resistance is less than 100k ohms, then a malfunctioning aftertreatment diesel exhaust fluid controller harness has been detected.
Linked Solutions
- None
Repair
- Repair or replace aftertreatment diesel exhaust fluid controller harness.
Validation
- Connect all components
- Connect the recommended Cummins® electronic service tool or equivalent.
- Disable 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: S00003184
Verification
Conditions
- Turn keyswitch OFF.
- Disconnect the 86-pin aftertreatment diesel exhaust fluid controller OEM wiring harness connector.
- Disconnect the aftertreatment diesel exhaust fluid dosing unit from the aftertreatment diesel exhaust fluid controller wiring harness.
Action
- Inspect the pins and connectors for damage.
- Measure the resistance between the aftertreatment diesel exhaust fluid dosing unit SIGNAL pin at the aftertreatment diesel exhaust fluid controller wiring harness 86-pin connector and all other pins in the connector.
- Refer to the circuit diagram or wiring diagram for connector pin identification.
Specification
- A malfunctioning aftertreatment diesel exhaust fluid controller wiring harness has been detected if the resistance is less than the following specification: 100k ohms
Linked Solutions
- None
Repair
- Repair or replace aftertreatment diesel exhaust fluid controller wiring harness.
Validation
- Connect all components
- Connect the recommended Cummins® electronic service tool or equivalent.
- Disable 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: S00003120
Verification
Conditions
- Turn keyswitch ON.
- Connect the recommended Cummins® electronic service tool or equivalent.
Action
- Use the recommended Cummins® electronic service tool or equivalent.
- Verify the present aftertreatment diesel exhaust fluid controller software phase.
Specification
- If the aftertreatment diesel exhaust fluid controller software phase revision is not the latest, then proceed to the Repair section.
Linked Solutions
- None
Repair
- Download the updated diesel exhaust fluid controller calibration code.
Validation
- Connect all components
- Connect the recommended Cummins® electronic service tool or equivalent.
- Disable 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: S00003185
Verification
Conditions
- Connect the 86-pin connector to the aftertreatment diesel exhaust fluid controller.
- Connect the aftertreatment diesel exhaust fluid dosing unit to the aftertreatment diesel exhaust fluid controller.
- Turn keyswitch ON.
Action
- Verify all preceding solution verifications for this fault code have been performed.
Specification
- If the fault code is still active after all the preceding solution verifications have been performed, then a malfunctioning aftertreatment diesel exhaust fluid dosing unit has been detected.
Linked Solutions
- None
Validation
- Connect all components
- Connect the recommended Cummins® electronic service tool or equivalent.
- Disable 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.