FAULT CODE 2387
VGT Actuator Driver Circuit (Motor) – Mechanical System Not Responding or Out of Adjustment
Overview
| CODE | REASON | EFFECT |
| Fault Code: 2387 PID: S27 SPN: 641 FMI: 7/7 LAMP: Amber SRT: |
The smart VGT controller has detected incorrect stop limits, or the VGT is unable to move to the closed position.
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Possible reduced engine performance.
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VGT Actuator Circuit
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Circuit Description
The variable geometry turbocharger (VGT) is electronically activated by the VGT actuator. The VGT actuator is a smart device and receives information via the J1939 data link from the primary engine control module (ECM). The VGT actuator performs its own diagnostics and reports malfunctions back to the primary engine ECM, using the J1939 data link. The ECM then decodes the error message and converts it to a fault code.
Component Location
The VGT actuator is located on the turbocharger bearing housing.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is running.
Conditions for Setting the Fault Codes
The Variable Geometry Turbocharger (VGT) actuator position could not meet the commanded position for greater than 10 seconds.
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.
- The VGT actuator will continue to attempt to meet commanded position, even when the CHECK ENGINE lamp is on.
- Active and stationary regeneration of the diesel particulate filter will be disabled.
- Exhaust gas recirculation (EGR) valve operation will be disabled.
- 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
- To validate the repair using a Diagnostic Road Test, utilize a route that incorporates both stop and go city type driving and steady state highway type driving. It may be necessary to load the unit for certain diagnostics in the ECM to run.
- To validate the repair using a Chassis Dynamometer, utilize a routine that incorporates acceleration and motoring events, steady state highway type operation, and load. This will simulate normal driving and allow the diagnostics in the ECM to run.
- The ECM will turn off the amber CHECK 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 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 turbocharger
- A malfunctioning turbocharger actuator
Troubleshooting Summary
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: 1896, 2353, 2357, 2359, 2961, 2962
- Turbocharger: 1894, 2636, 6432
Linked Solutions
- None
Repair
- Perform a search on the appropriate fault codes.
Validation
- None
Verification
Conditions
- Reconnect previously disconnected components.
- 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 Diesel Particulate Filter Regeneration Analyzer Test.
- Verify the recommended Cummins electronic service tool or equivalent has a version that supports this test.
Specification
- If the Aftertreatment Diesel Particulate Filter Regeneration Analyzer Test does not pass, then reset the search to Aftertreatment Diesel Particulate Filter Regeneration Analyzer Did Not Pass. Only select the solution title that matches the error messages in the recommend Cummins electronic service tool or equivalent.
- If the Aftertreatment Diesel Particulate Filter Regeneration Analyzer Test will not start, then reset the search to Aftertreatment Diesel Particulate Filter Regeneration Analyzer Did Not Start.
- If the Aftertreatment Diesel Particulate Filter Regeneration Analyzer Test does not complete, then reset the search to Aftertreatment Diesel Particulate Filter Regeneration Analyzer Did Not Complete.
Linked Solutions
- None
Repair
- No additional action is required for this solution.
Validation
- None
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.