Overview
| CODE | REASON | EFFECT |
| Fault Code: 3137 PID: SPN: 5019 FMI: 4/4 LAMP: Amber SRT: |
Low signal voltage detected at the EGR orifice pressure sensor.
|
Possible reduced engine performance. |
Circuit Description
The engine control module (ECM) provides a 5 volt supply to the EGR orifice pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The EGR orifice pressure sensor provides a signal to the ECM on the EGR orifice pressure sensor signal circuit. This sensor signal voltage changes based on the pressure at the EGR orifice pressure sensor.
Component Location
The EGR orifice pressure sensor is mounted on the EGR mass measurement assembly near the EGR differential pressure sensor.
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 the EGR orifice pressure sensor signal voltage was less than 0.25 volts for 5 seconds.
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.
Exhaust gas recirculation (EGR) valve operation will be 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, 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.
- 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:
Signal circuit open or shorted to ground in the engine harness or sensor
- Supply wire open or shorted to ground.
Troubleshooting Summary
Solution: S00000062
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:
- Sensor supply 1: 352
- Sensor supply 2: 187
Linked Solutions
- None
Repair
- Perform a search on the appropriate fault codes.
Validation
- None
Solution: S00003033
Verification
Conditions
- Turn keyswitch OFF.
- Disconnect the EGR outlet pressure sensor from the engine wiring harness.
Action
- Inspect the pins and connectors for damage.
- Turn keyswitch ON.
- Measure the voltage between the EGR outlet pressure sensor SUPPLY pin and the EGR outlet pressure sensor RETURN pin at the sensor connector of the engine wiring harness.
- Refer to the circuit diagram or wiring diagram for connector pin identification.
Specification
- Proceed to the Linked Solutions section if voltage is not within the following specification: 4.75 – 5.25 VDC
Repair
- No additional action is required for this solution.
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: S00003034
Verification
Conditions
- Turn keyswitch OFF.
Action
- Disconnect the engine wiring harness from the ECM.
- Inspect the pins and connectors for damage.
- Turn keyswitch ON.
- Measure the voltage between the EGR outlet pressure sensor SUPPLY pin and the EGR outlet pressure sensor RETURN pin at the ECM.
- Refer to the circuit diagram or wiring diagram for connector pin identification.
Specification
- A malfunctioning ECM has been detected if voltage at the ECM connector is not within the following specification: 4.75 – 5.25 VDC
- A malfunctioning OEM wiring harness has been detected if voltage at the ECM connector is within the following specification: 4.75 – 5.25 VDC
Linked Solutions
- None
Repair
Repair or replace only the components that were found to be out of specification.
- Replace the ECM.
- Repair or replace the engine wiring harness.
Validation
- None