SPN 3241 - FMI 11 (Fault Code 1663)
SPN3241 FMI11
Catalyst Inlet Temperature Sensor Swapped with Outlet - Condition Exists
CODES:
Fault Code: 1663
PID(P), SID(S): None
SPN: 3241
FMI: 11/31
Lamp: Amber
REASON: Catalyst Inlet Temperature Sensor Swapped with Outlet - Condition Exists. The inlet and
outlet catalyst temperature sensor connections are swapped.
EFFECT: Active aftertreatment diesel particulate filter regeneration will be disabled.
Circuit Description:
The aftertreatment system is monitored by three temperature sensors that are located in the exhaust system. The aftertreatment diesel oxidation catalyst inlet temperature sensor is located after the turbocharger outlet. The aftertreatment diesel particulate filter inlet temperature sensor is located between the aftertreatment catalyst and aftertreatment particulate filter. The aftertreatment diesel particulate filter outlet temperature sensor is located after the aftertreatment particulate filter. These sensors monitor the temperatures in the aftertreatment system and determine if the aftertreatment catalyst is missing.
Component Location:
The aftertreatment temperature sensors are located in the aftertreatment system. Refer to the original equipment manufacturer (OEM) troubleshooting and repair manual for specific exhaust gas temperature sensor locations.
Conditions for Running the Diagnostics:
This diagnostic runs when the aftertreatment system is actively regenerating the aftertreatment diesel particulate filter. The diagnostic also runs during engine warm-up.
Conditions for Setting the Fault Codes:
The engine control module (ECM) detects the aftertreatment diesel oxidation catalyst inlet temperature reading is higher than the aftertreatment diesel particulate filter inlet temperature during an active regeneration event of the diesel particulate filter.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• Active regeneration of the aftertreatment diesel particulate filter will be disabled.
• The exhaust gas recirculation (EGR) valve operation will be disabled.
Conditions for Clearing the Fault Code:
The fault code will be set inactive following a key cycle if the fault was triggered during a regeneration event. If the fault code is active at key ON, allow the after-treatment temperatures to cool below 49°C [120°F] and then start and run the engine at high idle for 10 minutes to clear the fault code.
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 fault code is activated when the ECM determines that the temperature reading from the aftertreatment diesel oxidation catalyst inlet temperature sensor and the aftertreatment diesel particulate filter inlet temperature sensor are reading backwards. The most likely cause of this fault code is that the aftertreatment diesel oxidation catalyst inlet temperature sensor and the aftertreatment diesel particulate filter inlet temperature sensor connectors are swapped at the OEM harness.
The diesel oxidation catalyst inlet temperature sensor and the diesel particulate filter outlet temperature sensor are the same part number and have the same electrical connections. The diesel particulate filter inlet temperature sensor has a different connector key to prevent it from being swapped with the other temperature sensors. Verify that the aftertreatment temperature sensors are correctly installed.
An in-range failure of the aftertreatment diesel oxidation catalyst or the aftertreatment diesel particulate filter inlet temperature can cause this fault code. Make sure there are not any fault codes related to the aftertreatment temperature sensors before following this troubleshooting tree.
Read More:
SPN 91 - FMI 2 (Fault Code 1242)
SPN 2623 - FMI 4 (Fault Code 1241)
Blog.Teknisi
Catalyst Inlet Temperature Sensor Swapped with Outlet - Condition Exists
 |
| ISB, ISC, and ISL - Aftertreatment Temperature Sensors |
CODES:
Fault Code: 1663
PID(P), SID(S): None
SPN: 3241
FMI: 11/31
Lamp: Amber
REASON: Catalyst Inlet Temperature Sensor Swapped with Outlet - Condition Exists. The inlet and
outlet catalyst temperature sensor connections are swapped.
EFFECT: Active aftertreatment diesel particulate filter regeneration will be disabled.
Circuit Description:
The aftertreatment system is monitored by three temperature sensors that are located in the exhaust system. The aftertreatment diesel oxidation catalyst inlet temperature sensor is located after the turbocharger outlet. The aftertreatment diesel particulate filter inlet temperature sensor is located between the aftertreatment catalyst and aftertreatment particulate filter. The aftertreatment diesel particulate filter outlet temperature sensor is located after the aftertreatment particulate filter. These sensors monitor the temperatures in the aftertreatment system and determine if the aftertreatment catalyst is missing.
Component Location:
The aftertreatment temperature sensors are located in the aftertreatment system. Refer to the original equipment manufacturer (OEM) troubleshooting and repair manual for specific exhaust gas temperature sensor locations.
Conditions for Running the Diagnostics:
This diagnostic runs when the aftertreatment system is actively regenerating the aftertreatment diesel particulate filter. The diagnostic also runs during engine warm-up.
Conditions for Setting the Fault Codes:
The engine control module (ECM) detects the aftertreatment diesel oxidation catalyst inlet temperature reading is higher than the aftertreatment diesel particulate filter inlet temperature during an active regeneration event of the diesel particulate filter.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
• Active regeneration of the aftertreatment diesel particulate filter will be disabled.
• The exhaust gas recirculation (EGR) valve operation will be disabled.
Conditions for Clearing the Fault Code:
The fault code will be set inactive following a key cycle if the fault was triggered during a regeneration event. If the fault code is active at key ON, allow the after-treatment temperatures to cool below 49°C [120°F] and then start and run the engine at high idle for 10 minutes to clear the fault code.
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 fault code is activated when the ECM determines that the temperature reading from the aftertreatment diesel oxidation catalyst inlet temperature sensor and the aftertreatment diesel particulate filter inlet temperature sensor are reading backwards. The most likely cause of this fault code is that the aftertreatment diesel oxidation catalyst inlet temperature sensor and the aftertreatment diesel particulate filter inlet temperature sensor connectors are swapped at the OEM harness.
The diesel oxidation catalyst inlet temperature sensor and the diesel particulate filter outlet temperature sensor are the same part number and have the same electrical connections. The diesel particulate filter inlet temperature sensor has a different connector key to prevent it from being swapped with the other temperature sensors. Verify that the aftertreatment temperature sensors are correctly installed.
An in-range failure of the aftertreatment diesel oxidation catalyst or the aftertreatment diesel particulate filter inlet temperature can cause this fault code. Make sure there are not any fault codes related to the aftertreatment temperature sensors before following this troubleshooting tree.
Read More:
SPN 91 - FMI 2 (Fault Code 1242)
SPN 2623 - FMI 4 (Fault Code 1241)
Blog.Teknisi
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