Overview

Code

Fault Code: 1896

PID: S146

SPN: 2791

FMI: 13/13

LAMP: Amber

SRT:  

Reason

The EGR valve has failed the automatic calibration procedure at initial key ON

Effect

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.

Component Location

The EGR Valve and EGR Differential Pressure Sensor location varies depending on engine model.

Conditions for Running the Diagnostics

This diagnostic runs at key OFF with coolant temperature above 85°C [185° F].

Conditions for Setting the Fault Codes

The Engine Control Module (ECM) detected the EGR valve failed the autozero span check.

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, bring the engine up to operating temperature and run it in normal loaded conditions for 15 minutes.
• Turn the key switch OFF and allow the ECM to completely powerdown.
• Start and idle the engine 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 after the diagnostic runs and passes.
• For On-Board Diagnostics (OBD) engines, the ECM will turn off the 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

When the keyswitch is initially turned ON and at various times during engine operation, the closed position of the EGR valve is checked. This diagnostic checks to make sure the EGR valve is not stuck open.

The EGR valve will close when the fault code is active. The fault code will remain active until the next key cycle.

The aftertreatment system must be inspected after making the appropriate repair outlined in this fault code troubleshooting tree. Progressive damage to the aftertreatment system may have occurred. Perform the Snap-Acceleration Test to check for a malfunctioning diesel particulate filter.

Contact Us

Whatsapp: +84.858.966.333
Facebook: VIETVehicle Remote Delete Service
YouTube: VIETVehicle – ECM Delete Tuning
Tiktok: VIETVehicle.com
Website: VIETVehicle.com