Cummins X12 CM2350 Fault Code 1961 |SPN 2791 |FMI 0/15 |PID S146

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FAULT CODE 1961

EGR Valve Control Circuit Over Temperature – Data Valid But Above Normal Operating Range – Least Severe Level

Overview

 

CODE REASON EFFECT
Fault Code: 1961
PID: S146
SPN: 2791
FMI: 0/15
LAMP: Amber
SRT:

 

High EGR valve driver temperature has been detected.

 

 

Possible reduced engine performance.

 
EGR Valve Circuit

Circuit Description

The exhaust gas recirculation (EGR) valve is controlled by a brushless motor located on top of the EGR valve. The EGR valve motor uses three different motor legs to move the valve through its range of motion. The ECM uses the EGR motor A, B, and C wires to command the EGR valve to the appropriate position in order to meet EGR flow targets.The EGR valve motor contains three position sensors that detect the location of the EGR valve. These sensors report the position of the valve back to the ECM over the EGR valve position A, B, and C wires.

The EGR valve motor contains three position sensors that detect the location of the EGR valve. These sensors report the position of the valve back to the ECM over the EGR valve position A, B, and C wires.

Component Location

The EGR valve device driver is internal to the ECM and can not be serviced separately.

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 temperature of the EGR valve driver internal to the ECM was greater than 150C [302F].

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 and stationary regeneration of the diesel particulate filter will be disabled.

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 INSITE electronic service tool 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 INSITE electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications

 

Shop Talk

This fault code may be inactive when the vehicle is in the shop because the EGR valve driver temperature has cooled down. Therefore, troubleshoot multiple inactive counts of this fault code as an active fault code.

Possible causes of this fault code include:

Malfunctioning ECM.

 

Troubleshooting Summary

  1. Fault code is for information only
  2. ECM calibration revision history check

Verification

Conditions

  • Turn keyswitch OFF.

Action

  • This solution is for information only stating that the EGR actuator internal temperature is above a calibrated threshold.

Specification

  • This solution is information only.

Linked Solutions

  • None

Repair

  • This fault code is for information only.
  • No repair is necessary.

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.