B6.7 CM2450 B155B Fault Code: 6735 | SPN: 5569 | FMI: 16Aftertreatment 1 Diesel Particulate Filter 1 Soot Sensor ECU Internal Temperature – Data Valid But Above Normal Operating Range – Moderately Severe Level

Overview

Circuit Description

The aftertreatment particulate matter sensor is a smart device and communicates with the engine control module (ECM) via the J1939 data link. The aftertreatment particulate matter sensor performs internal diagnostics and reports malfunctions back to the primary ECM using the J1939 data link. The particulate matter sensor is permanently attached to the particulate matter control module. They are serviced as a single component and can not be replaced individually. The aftertreatment particulate matter sensor is used to measure the soot emissions at the outlet of the aftertreatment system.

Component Location

The aftertreatment particulate matter sensor location can vary depending on engine application. It is usually located in the exhaust system at the outlet of the selective catalytic reduction (SCR) catalyst.

Conditions for Running the Diagnostics

This diagnostic runs continuously when the engine is running.

Conditions for Setting the Fault Codes

The aftertreatment diesel particulate filter soot sensor module reported the internal circuit board temperature was too high.

Action Taken When the Fault Code is Active

• The ECM illuminates the amber CHECK ENGINE lamp and/or malfunction indicator lamp (MIL) after the diagnostic fails on two consecutive trips.

Conditions for Clearing the Fault Code

• Perform a key cycle.
• Start and idle the engine.
• To validate the repair, use the recommended Cummins® electronic service tool or equivalent to perform the “Aftertreatment Current Based Particulate Matter Sensor Regeneration Test” found in ECM Diagnostic Test.
• The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• 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.
• 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

This fault code indicates the internal temperature of the aftertreatment diesel particulate filter soot sensor module was too high. Troubleshoot the exhaust system for leaks, missing heat shields, or dirt and debris that could lead to overheating of the aftertreatment diesel particulate filter soot sensor module.