Aftertreatment Fuel Shutoff Valve 1 – Mechanical System Not Responding Properly or Out of Adjustment
|Fault Code: 1963 (ISX)
Aftertreatment Fuel Shutoff Valve 1 – Mechanical System Not Responding Properly or Out of Adjustment. The aftertreatment fuel shutoff valve has been detected to be stuck closed.
Active aftertreatment diesel particulate filter regeneration will be disabled.
ISX and ISM – Aftertreatment Fuel Injector System
This fault code checks for system errors in the aftertreatment fuel injection system. This diagnostic can detect fuel leaks in the system, as well as failures of the aftertreatment fuel injector, aftertreatment fuel shutoff valve, and aftertreatment fuel drain valve.
Every time the engine is started, a diagnostic test on the system is performed. The aftertreatment fuel drain valve opens and relieves fuel pressure in the line. The aftertreatment fuel pressure sensor must be reading atmospheric pressure at this point in the test. The aftertreatment fuel drain valve closes and the aftertreatment fuel shutoff valve opens. This pressurizes the aftertreatment fuel system to gear pump operating pressure. The diagnostic then checks to make sure the aftertreatment fuel pressure sensor is reading gear pump operating pressure. The aftertreatment fuel shutoff valve then closes and traps the fuel between the aftertreatment fuel shutoff valve and the aftertreatment fuel injector. The diagnostic checks to make sure the system maintains fuel pressure. The aftertreatment fuel injector then briefly opens and relieves some of the fuel pressure trapped between the aftertreatment fuel shutoff valve and the aftertreatment fuel injector. The aftertreatment fuel drain valve then opens and relieves the remaining pressure in the system.
The aftertreatment fuel injector is installed in the exhaust system in the turbocharger outlet flange. The aftertreatment fuel pressure sensor, aftertreatment fuel shutoff valve, and aftertreatment fuel drain valve are installed in the shutoff valve manifold. Refer to Procedure 100-002 in Section E.
Conditions for Running the Diagnostics
This diagnostic runs:
- During the first 5 minutes of engine operation
- Prior to injecting fuel for an active regeneration, but only if greater than 2 hours have elapsed since the previous regeneration event or key-on
- After an active regeneration.
Conditions for Setting the Fault Codes
The electronic control module (ECM) has detected that the aftertreatment fuel shutoff valve has been detected to be stuck closed.
Action Taken When the Fault Code is Active
- The ECM will illuminate the amber CHECK ENGINE lamp immediately after the diagnostic runs and fails.
- Active regeneration of the aftertreatment diesel particulate filter will be disabled.
Conditions for Clearing the Fault Code
The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
Clear the fault code by starting and idling the engine for 5 minutes.
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.
Possible causes of this fault code include:
- Stuck closed aftertreatment fuel shutoff valve
- Fuel restriction between the fuel system and the aftertreatment fuel shutoff valve assembly
- On ISM engines, remove the aftertreatment fuel line connection from the cylinder head. Inspect the fuel rail in the cylinder head for a plastic plug or ”stringer” that may be blocking the fuel supply to the aftertreatment system