Overview
| CODE | REASON | EFFECT |
| Fault Code: 7896 PID: SPN: 1761 FMI: 11/31 LAMP: Amber SRT: |
The aftertreatment diesel exhaust fluid tank level has fallen below the critical warning level.
|
Possible reduced engine performance. |
Circuit Description
The aftertreatment diesel exhaust fluid level sensor is used to monitor the diesel exhaust fluid level inside the diesel exhaust fluid tank.
Component Location
The aftertreatment diesel exhaust fluid tank level sensor is located in the aftertreatment diesel exhaust fluid tank. Location of the tank and level sensor is OEM dependent. 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 diesel exhaust fluid tank was critically low.
Action Taken When the Fault Code is Active
- The diesel exhaust fluid lamp will be flashing.
- The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
- Engine torque will be severely reduced.
Vehicle speed will be limited to 8 km [5 mi] per hour after the engine has been shutdown, 1 hour of engine idle time, or the fuel tank has been refilled.
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 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 indicates that the Diesel Exhaust Fluid (DEF) level is critically low and there will be a power loss. Engine power will be reduced automatically.This can be corrected by refilling the DEF tank. Normal engine power will be restored after refilling the DEF tank.
Troubleshooting Summary
Solution: S00000546
Verification
Conditions
- Turn keyswitch ON.
- Connect the recommended Cummins® electronic service tool or equivalent.
Action
- Inspect the pins and connectors for damage.
- Visually check the level of the aftertreatment diesel exhaust fluid in the aftertreatment diesel exhaust fluid tank.
- Monitor the position of the aftertreatment diesel exhaust fluid level with the recommended Cummins® electronic service tool or equivalent.
- Compare the reading from the recommended Cummins® electronic service tool or equivalent to the actual level of the aftertreatment diesel exhaust fluid.
Specification
- If the actual aftertreatment diesel exhaust fluid level is within specification and the recommended Cummins® electronic service tool or equivalent reading is not the same as the actual level, then a malfunctioning aftertreatment diesel exhaust fluid level sensor have been detected.
Linked Solutions
- None
Repair
- Replace the aftertreatment diesel exhaust fluid tank level sensor.
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: 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.