SPN 411 - FMI 18 (Fault Code 1899)
SPN411 FMI18
Exhaust Gas Recirculation Valve Delta Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level
CODES:
Fault Code: 1899
PID(P), SID(S): P411
SPN: 411
FMI: 1/18
Lamp: Amber
REASON: Exhaust Gas Recirculation Valve Delta Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level. The EGR differential pressure sensor has detected low EGR gas flow or the EGR differential pressure reading is not valid for engine operating conditions.
EFFECT: Exhaust gas recirculation (EGR) valve actuation will be disabled.
Circuit Description:
The EGR differential pressure sensor has two ports that sense exhaust pressure. The sensor outputs a voltage which represents the pressure difference between the two ports. The engine control module (ECM) uses this pressure to determine how much exhaust gas is flowing in the EGR connection tube to the intake manifold. This information is used to control the EGR valve for correct emission levels.
The ECM provides a 5 volt supply to the EGR differential pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The EGR differential pressure sensor provides a signal to the ECM on the EGR differential pressure sensor signal circuit. This sensor signal voltage changes based on the differential pressure in the EGR crossover tube.
The EGR differential pressure sensor measures the exhaust gas pressure drop across the EGR differential pressure orifice. This pressure drop is used to calculate the amount of EGR flow into the intake manifold.
Component Location:
The sensor is located near the air intake.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the following conditions are met:
• EGR valve position is greater than 5 percent open
• Engine speed is greater than a calibratible value
• Engine torque output is greater than a calibratible value.
Conditions for Setting the Fault Codes:
• EGR differential pressure is less than a calibratible value.
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 operation will be disabled.
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 ECM calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable fixes to the calibration stored in the ECM.
This diagnostic checks the EGR differential pressure sensor reading when the EGR valve is open. Since the EGR valve is open, the reading of the EGR differential pressure must be greater than zero. If the ECM detects a reading lower than expected with the EGR valve open, this fault code is logged.
Possible causes of this fault code include:
• A malfunctioning EGR differential pressure sensor
• A stuck closed EGR valve
• EGR differential pressure sensor flow port cross-drillings are plugged with soot or shellac
• A fouled EGR cooler.
Read More:
SPN 411 - FMI 2 (Fault Code 1866)
SPN 2791 - FMI 13 (Fault Code 1896)
Blog.Teknisi
Exhaust Gas Recirculation Valve Delta Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level
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| ISB, ISC, and ISL - Differential Pressure Sensor |
CODES:
Fault Code: 1899
PID(P), SID(S): P411
SPN: 411
FMI: 1/18
Lamp: Amber
REASON: Exhaust Gas Recirculation Valve Delta Pressure - Data Valid But Below Normal Operating Range - Moderately Severe Level. The EGR differential pressure sensor has detected low EGR gas flow or the EGR differential pressure reading is not valid for engine operating conditions.
EFFECT: Exhaust gas recirculation (EGR) valve actuation will be disabled.
Circuit Description:
The EGR differential pressure sensor has two ports that sense exhaust pressure. The sensor outputs a voltage which represents the pressure difference between the two ports. The engine control module (ECM) uses this pressure to determine how much exhaust gas is flowing in the EGR connection tube to the intake manifold. This information is used to control the EGR valve for correct emission levels.
The ECM provides a 5 volt supply to the EGR differential pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The EGR differential pressure sensor provides a signal to the ECM on the EGR differential pressure sensor signal circuit. This sensor signal voltage changes based on the differential pressure in the EGR crossover tube.
The EGR differential pressure sensor measures the exhaust gas pressure drop across the EGR differential pressure orifice. This pressure drop is used to calculate the amount of EGR flow into the intake manifold.
Component Location:
The sensor is located near the air intake.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the following conditions are met:
• EGR valve position is greater than 5 percent open
• Engine speed is greater than a calibratible value
• Engine torque output is greater than a calibratible value.
Conditions for Setting the Fault Codes:
• EGR differential pressure is less than a calibratible value.
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 operation will be disabled.
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 ECM calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable fixes to the calibration stored in the ECM.
This diagnostic checks the EGR differential pressure sensor reading when the EGR valve is open. Since the EGR valve is open, the reading of the EGR differential pressure must be greater than zero. If the ECM detects a reading lower than expected with the EGR valve open, this fault code is logged.
Possible causes of this fault code include:
• A malfunctioning EGR differential pressure sensor
• A stuck closed EGR valve
• EGR differential pressure sensor flow port cross-drillings are plugged with soot or shellac
• A fouled EGR cooler.
Read More:
SPN 411 - FMI 2 (Fault Code 1866)
SPN 2791 - FMI 13 (Fault Code 1896)
Blog.Teknisi
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