CM871 and CM876 Electronic Control Systems, ISX and ISM Engines – FAULT CODE 2637

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Overview

ISX and ISM – Aftertreatment System SMALL | MEDIUM | LARGE

Circuit Description

This fault code is set when the inlet face of the diesel oxidation catalyst is detected to be plugged with soot.

The aftertreatment system is monitored by three temperature sensors that are located in the exhaust system. The temperature sensors around the aftertreatment diesel oxidation catalyst are used to monitor the temperature differential across the catalyst during active regeneration of the aftertreatment system.

Component Location

The aftertreatment diesel oxidation catalyst is located in the exhaust system. The location of the catalyst may vary depending on the original equipment manufacturer (OEM). Refer to the OEM service manual.

Conditions for Running the Diagnostics

This diagnostic runs continuously when the engine is running and an active regeneration of the aftertreatment is occurring.

Conditions for Setting the Fault Codes

The ECM detects that the conditions for face plugging of the diesel oxidation catalyst are present and that plugging may have occurred.

Action Taken When the Fault Code is Active

• The fault code is logged immediately when the diagnostic runs and fails.
• Active aftertreatment diesel particulate filter regeneration will be disabled.
• The exhaust gas recirculation (EGR) valve operation will be disabled.

Conditions for Clearing the Fault Code

The fault code will be set to inactive after performing the INSITE™ electronic service tool Diesel Oxidation Catalyst Maintenance Reset procedure found under the Aftertreatment Maintenance section of Advanced ECM Data, or when the condition for diesel oxidation catalyst face plugging are no longer occurring.

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, calibrate the ECM. Refer to Procedure 019-032 in Section 19.

This fault code is set when the inlet face of the diesel oxidation catalyst is detected to be plugged with soot.

Possible causes of this fault code include:

• Engine oil or fuel plugging the front face of the aftertreatment diesel oxidation catalyst.

Refer to Troubleshooting Fault Code 2637.