SPN 633 - FMI 11 (Fault Code 2311)
SPN633 FMI11/31
Electronic Fuel Injection Control Valve Circuit - Condition Exists
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| ISB, ISC, and ISL with CM2150 - Electronic Fuel Injection Control Valve Circuit |
Fault Code: 2311
PID(P), SID(S): S018
SPN: 633
FMI: 11/31
Lamp: Amber
REASON: Electronic Fuel Injection Control Valve Circuit - Condition Exists. Fuel pump actuator circuit resistance too high or too low.
EFFECT: Possible low power.
Circuit Description:
The circuit is a pulse width modulated driver in the electronic control module (ECM) that controls the electronic fuel control actuator. The actuator is grounded in the ECM. The ECM varies the current to this valve to provide the correct fuel flow to the high-pressure pump based on engine operating conditions. The electronic fuel control actuator valve is a normally open valve. High circuit resistance can cause fuel pressure to be higher than commanded at light loads.
Component Location:
The fuel pump actuator valve is located on the engine-mounted fuel pump housing.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position.
Conditions for Setting the Fault Codes:
This fault is set when the fuel pump actuator circuit has intermittent circuit problems.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• Fuel rail pressure will be higher than the commanded rail pressure.
Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE light immediately after 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.
If this fault code occurs during road test, verify that all connectors are clean and free of corrosion before replacing components. This fault code can become active for any of the following reasons:
• Fuel pump actuator high resistance
• Engine harness high resistance
• Loose, worn, or corroded connectors or pins
• Fuel pump actuator with low internal resistance
• Fuel pump actuator or engine harness that has shorted to ground
• Intermittent circuit failures that cause the fuel pressure to exceed the fuel rail pressure relief valve opening pressure.
If an intermittent electrical circuit problem of the fuel pump actuator circuit exists, it is possible for the fault code to become active then inactive during normal engine operation. For example, if a poor connection causes an intermittent open or short circuit, the normally open valve will open in a fraction of a second while the circuit is faulty, causing the fuel rail pressure relief valve to open. Following the event that caused the fuel rail pressure relief valve to open, the ECM will attempt to reset the fuel rail pressure relief valve, provided the fuel pump actuator circuit is not still faulty.
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