CM871 and CM876 Electronic Control Systems, ISX and ISM Engines – FAULT CODE 1961

EGR Valve Control Circuit Calculated Over Temperature – Data Valid but Above Normal Operational Range – Least Severe Level


Overview

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

EGR Valve Control Circuit Calculated Over Temperature – Data Valid but Above Normal Operational Range – Least Severe Level. The EGR valve has detected a high temperature condition.

EGR valve operation will be disabled.

ISX – EGR Actuator Circuit
SMALL | MEDIUM | LARGE
ISM – VGT Actuator
SMALL | MEDIUM | LARGE

Circuit Description

The exhaust gas recirculation (EGR) valve is a smart device that receives commands from the engine electronic control module (ECM) via the J1939 datalink. The EGR valve performs its own internal diagnostics and reports failures back to the primary engine ECM using the J1939 datalink.

The EGR valve is opened by a motor located on top of the EGR valve. A motor shaft extends from the motor and contacts the dual-poppet valve to open the EGR valve. The EGR valve motor does not actually retract the EGR valve. The motor current is reduced and the spring pushes the EGR valve closed.

Component Location

The EGR valve location can vary depending on the engine application. Refer to Procedure 100-002 (Engine Diagrams) in Section E for a detailed component location view.

Conditions for Running the Diagnostics

The diagnostic runs continuously when the keyswitch is turned on.

Conditions for Setting the Fault Codes

This fault code logs when the internal temperature of the EGR valve motor is above 135°C [275°F].

Action Taken When the Fault Code is Active

  • The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
  • EGR valve operation will be disabled.

Conditions for Clearing the Fault Code

The fault code is set inactive when the internal temperature of the EGR valve motor is below 125°C [257°F].

Shop Talk

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.

This fault code is for information only. No action is taken when this fault code is logged.

Refer to Troubleshooting Fault Code t05-1961

Last Modified:  09-Jul-2010