SPN 3250 - FMI 13 (Fault Code 1691)
SPN3250 FMI13
Catalyst Efficiency - Out of Calibration
CODES:
Fault Code: 1691
PID(P), SID(S): None
SPN: 3250
FMI: 13/13
Lamp: Amber
REASON: Catalyst Efficiency - Out of Calibration. The temperature increase across the aftertreatment diesel oxidation catalyst is lower than expected.
EFFECT: None on performance. 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 (DOC) inlet temperature sensor is located after the turbocharger outlet at the inlet of the aftertreatment system. The aftertreatment diesel particulate filter inlet temperature sensor is located between the aftertreatment diesel oxidation catalyst and the aftertreatment diesel particulate filter. The aftertreatment diesel particulate filter outlet temperature sensor is located after the aftertreatment diesel particulate filter. The temperature sensors around
the aftertreatment diesel oxidation catalyst are used to monitor the temperature differential across the catalyst during active regeneration of the aftertreatment system.
Component Location:
The aftertreatment diesel oxidation catalyst is located in the exhaust system. The location of the catalyst can vary, depending on the original equipment manufacturer (OEM).
Conditions for Running the Diagnostics:
Active regeneration of the aftertreatment diesel particulate filter must be occurring before the diagnostic will run.
Conditions for Setting the Fault Codes:
The electronic control module (ECM) has calculated DOC efficiency to be less than required to successfully complete a regeneration.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code:
• Perform INSITE™ electronic service tool Aftertreatment Reset procedure.
• Perform INSITE™ electronic service tool Aftertreatment Diesel Particulate Filter Regeneration Test.
• This fault code also clears following a key cycle.
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.
This fault code is logged when the conversion efficiency of the DOC is calculated to be less than that required to perform an effective regeneration.
Possible causes of this fault code include:
• Soot plugging the front face of the aftertreatment diesel oxidation catalyst
• Engine oil or fuel contamination of the aftertreatment diesel oxidation catalyst
• A cracked or contaminated aftertreatment diesel oxidation catalyst
• A leaking exhaust system between the turbocharger and the diesel oxidation catalyst.
• Excessive automatic/stationary regenerations causing soot plugging on the front face of the aftertreatment diesel oxidation catalyst. An in-range malfunction of the aftertreatment diesel oxidation catalyst temperature sensor or the aftertreatment diesel particulate filter inlet temperature sensor 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 3249 - FMI 3 (Fault Code 1675)
SPN 3249 - FMI 2 (Fault Code 1676)
Blog.Teknisi
Catalyst Efficiency - Out of Calibration
 |
| ISB, ISC, and ISL - Aftertreatment System |
CODES:
Fault Code: 1691
PID(P), SID(S): None
SPN: 3250
FMI: 13/13
Lamp: Amber
REASON: Catalyst Efficiency - Out of Calibration. The temperature increase across the aftertreatment diesel oxidation catalyst is lower than expected.
EFFECT: None on performance. 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 (DOC) inlet temperature sensor is located after the turbocharger outlet at the inlet of the aftertreatment system. The aftertreatment diesel particulate filter inlet temperature sensor is located between the aftertreatment diesel oxidation catalyst and the aftertreatment diesel particulate filter. The aftertreatment diesel particulate filter outlet temperature sensor is located after the aftertreatment diesel particulate filter. The temperature sensors around
the aftertreatment diesel oxidation catalyst are used to monitor the temperature differential across the catalyst during active regeneration of the aftertreatment system.
Component Location:
The aftertreatment diesel oxidation catalyst is located in the exhaust system. The location of the catalyst can vary, depending on the original equipment manufacturer (OEM).
Conditions for Running the Diagnostics:
Active regeneration of the aftertreatment diesel particulate filter must be occurring before the diagnostic will run.
Conditions for Setting the Fault Codes:
The electronic control module (ECM) has calculated DOC efficiency to be less than required to successfully complete a regeneration.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code:
• Perform INSITE™ electronic service tool Aftertreatment Reset procedure.
• Perform INSITE™ electronic service tool Aftertreatment Diesel Particulate Filter Regeneration Test.
• This fault code also clears following a key cycle.
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.
This fault code is logged when the conversion efficiency of the DOC is calculated to be less than that required to perform an effective regeneration.
Possible causes of this fault code include:
• Soot plugging the front face of the aftertreatment diesel oxidation catalyst
• Engine oil or fuel contamination of the aftertreatment diesel oxidation catalyst
• A cracked or contaminated aftertreatment diesel oxidation catalyst
• A leaking exhaust system between the turbocharger and the diesel oxidation catalyst.
• Excessive automatic/stationary regenerations causing soot plugging on the front face of the aftertreatment diesel oxidation catalyst. An in-range malfunction of the aftertreatment diesel oxidation catalyst temperature sensor or the aftertreatment diesel particulate filter inlet temperature sensor 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 3249 - FMI 3 (Fault Code 1675)
SPN 3249 - FMI 2 (Fault Code 1676)
Blog.Teknisi
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