SPN 2791 - FMI 13 (Fault Code 1896)

SPN2791 FMI13
EGR Valve Controller - Out of Calibration

ISB, ISC, and ISL - EGR Valve Circuit

Fault Code: 1896
PID(P), SID(S): S146
SPN: 2791
FMI: 13/13
Lamp: Amber

REASON: EGR Valve Controller - Out of Calibration. The EGR valve has failed the automatic calibration procedure at initial key-on.

EFFECT: EGR valve actuation will be disabled.

Circuit Description:
The exhaust gas recirculation (EGR) valve is opened by a motor located on top of the EGR valve. A pin is extended from the motor and contacts the dual-poppet valve to open the EGR valve. The EGR valve motor is not used to close the EGR valve. The pin retracts and a spring is used to close the EGR valve.

Component Location:
The EGR valve location can vary, depending on the engine application.

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 EGR valve motor measures the position of the EGR valve at initial key-on. If the valve is detected to be greater than 20 percent open, the fault code is set active.

Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• The EGR valve will stop responding to commands and the spring will close the EGR valve.

Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE light and clear the fault code after the keyswitch is cycled and the diagnostic runs and passes.

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.

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. This fault code is logged when the following error conditions exist:
• The EGR valve motor measures the position of the EGR valve at initial key-on. If the valve is detected to be out of the normal position, this fault code will be logged.
• The EGR valve will close when the fault code is active.
• The fault code will remain active until the next key cycle.
The fault code will only go inactive if the initial key-on EGR position check passes.
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.

Read More:
SPN 101 - FMI 4 (Fault Code 1844)
SPN 411 - FMI 2 (Fault Code 1866)


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