Overview
| CODE | REASON | EFFECT |
| Fault Code: 1977 PID: S382 SPN: 3556 FMI: 5/5 LAMP: Amber SRT: |
High resistance, short circuit, or open circuit detected on the aftertreatment fuel injector circuit.
|
Possible reduced engine performance. |
Circuit Description
The aftertreatment fuel injector is electronically controlled by the engine electronic control module (ECM) through a pulse width modulated (PWM) signal. The amount of fuel injected is determined by how long the PWM signal to the injector is on.
Component Location
The aftertreatment fuel injector is installed in the exhaust system in the turbocharger adapter pipe. The aftertreatment fuel pressure sensor and aftertreatment fuel shutoff valve are installed in the shutoff valve manifold. The aftertreatment purge air actuator is located above the shutoff valve manifold.
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 Engine Control Module (ECM) detected a circuit error within the aftertreatment fuel injector circuit.
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.
Active regeneration of the aftertreatment diesel particulate filter will be disabled unitl the next key cycle.
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, start the engine and perform the recommended Cummins® electronic service tool or equivalent Aftertreatment Diesel Particulate Filter Regeneration Test.
- 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.
- 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:
An open circuit in the supply or return wire in the engine harness
An open circuit in the aftertreatment fuel injector solenoid
A short circuit to ground in the engine harness
A short circuit to voltage source in the engine harness
High resistance in the aftertreatment fuel injector solenoid
An extremely low resistance in the aftertreatment fuel injector solenoid
A damaged ECM.
Troubleshooting Summary
Solution: S00002869
Verification
Conditions
- Turn keyswitch OFF.
- Disconnect the aftertreatment fuel injector from the engine wiring harness.
Action
- Inspect the pins and connectors for damage.
- Measure the resistance between the aftertreatment fuel injector SIGNAL pin and aftertreatment fuel injector RETURN at the aftertreatment fuel injector connector.
- Refer to the circuit diagram or wiring diagram for connector pin identification.
Specification
- If the resistance is not between 0.5 and 2 Ω, then a malfunctioning aftertreatment fuel injector has been detected.
Linked Solutions
- None
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: S00002936
Verification
Conditions
- Turn keyswitch OFF.
- Disconnect the aftertreatment fuel injector from the engine wiring harness.
Action
- Inspect the pins and connectors for damage.
- Measure the resistance between the aftertreatment fuel injector SIGNAL pin and the metal case of the aftertreatment fuel injector.
- Refer to the circuit diagram or wiring diagram for connector pin identification.
Specification
- A malfunctioning aftertreatment fuel injector has been detected if the resistance is less than the following specification: 100k Ω
Linked Solutions
- None
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: S00003135
Verification
Conditions
- Turn keyswitch OFF.
- Disconnect the aftertreatment fuel injector from the engine wiring harness.
- Disconnect the engine wiring harness connector from the ECM.
Action
- Inspect the pins and connectors for damage.
- Measure the resistance between the aftertreatment fuel injector SIGNAL pin at the aftertreatment fuel injector engine wiring harness connector and aftertreatment fuel injector SIGNAL pin at the engine wiring harness ECM connector.
- Measure the resistance between the aftertreatment fuel injector RETURN pin at the aftertreatment fuel injector engine wiring harness connector and aftertreatment fuel injector RETURN pin at the engine wiring harness ECM connector.
- Refer to the circuit diagram or wiring diagram for connector pin identification.
Specification
- A malfunctioning engine wiring harness has been detected if the resistance is greater than the following specification: 10 Ω
Linked Solutions
- None
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: S00003151
Verification
Conditions
- Turn keyswitch OFF.
- Disconnect the engine wiring harness connector from the ECM.
- Disconnect the aftertreatment fuel injector from the engine wiring harness.
Action
- Inspect the pins and connectors for damage.
- Measure the resistance between the aftertreatment fuel injector SIGNAL pin at the engine wiring harness ECM connector and engine block ground.
- Measure the resistance between the aftertreatment fuel injector RETURN pin at the engine wiring harness ECM connector and engine block ground.
- Refer to the circuit diagram or wiring diagram for connector pin identification.
Specification
- A malfunctioning engine wiring harness has been detected if the resistance is less than the following specification: 100k Ω
Linked Solutions
- None
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: S00003149
Verification
Conditions
- Turn keyswitch OFF.
- Disconnect the engine wiring harness connector from the ECM.
- Disconnect the aftertreatment fuel injector from the engine wiring harness.
Action
- Inspect the pins and connectors for damage.
- Measure the resistance between the aftertreatment fuel injector SIGNAL pin at the engine wiring harness ECM connector and all other pins in the connector.
- Measure the resistance between the aftertreatment fuel injector RETURN pin at the engine wiring harness ECM connector and all other pins in the connector .
- Refer to the circuit diagram or wiring diagram for connector pin identification.
Specification
- A malfunctioning engine wiring harness has been detected if the resistance is less than the following specification: 100k Ω
Linked Solutions
- None
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.