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Reason:
Aftertreatment Diesel Particulate Filter Differential Pressure – Data Valid But Above Normal Operating Range – Least Severe Level. The soot load of the aftertreatment diesel particulate filter has exceeded the recommended limits.

Effect:
Possible reduced engine performance

Circuit Description:
The engine aftertreatment system monitors the soot load in the aftertreatment diesel particulate filter. Under normal operating conditions, the aftertreatment diesel particulate filter is self-cleaning, where soot is converted to carbon dioxide, nitrogen, and water. Under light load operating conditions, it can be necessary to perform a stationary regeneration of the aftertreatment diesel particulate filter. The soot load in the aftertreatment diesel particulate filter is estimated, using the aftertreatment differential pressure sensor and the calculated soot output of the engine.

Component Location:
The aftertreatment diesel particulate filter is located in the exhaust system and is installed by the original equipment manufacturer (OEM). Refer to the OEM service manual.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the soot load of the aftertreatment diesel particulate filter had reached the first stage of plugging.

Action Taken When the Fault Code is Active:
1) The ECM will illuminate the aftertreatment diesel particulate filter lamp immediately after the diagnostic is set.
2) The ECM will flash the aftertreatment dash lamp as the severity of the soot load increases.
3) Torque output of the engine will be reduced as the soot load in the aftertreatment diesel particulate filter increases.

Conditions for Clearing the Fault Code:
1) To validate the repair, start the engine and perform the INSITE™ electronic service tool
2) Aftertreatment Diesel Particulate Filter Regeneration Test.
3) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
4) The ECM will turn off the aftertreatment diesel particulate filter lamp immediately after the diagnostic runs and passes.
5) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
Note: This fault code indicates that the aftertreatment diesel particulate filter requires maintenance by performing a stationary regeneration procedure. This is a maintenance procedure only and is not covered by Cummins Inc. warranty.

Note: Repeated occurrences of this fault code may indicate the engine requires frequent regeneration. Refer to symptom tree t147 (Aftertreatment Diesel Particulate Filter-Excessive Automatic and/or Stationary Regeneration) to identify the cause of frequent regeneration.

Possible Causes:
1) The engine has been operating in light load operating conditions that prevent exhaust temperatures from being high enough to regenerate the aftertreatment diesel particulate filter
2) Possible engine damage that causes excessive black smoke to be generated.

Reason:
Engine Coolant Temperature – Condition Exists. The EGR valve was closed to reduce engine coolant temperature.

Effect:
Possible reduced engine performance.

Circuit Description:
The coolant temperature sensor is a variable resistor sensor and is used to measure the temperature of the coolant of the engine. The engine control module (ECM) supplies 5 volts to the coolant temperature signal circuit. The ECM monitors the change in voltage caused by changes in the resistance of the sensor to determine the coolant temperature.

Component Location:
The engine coolant temperature sensor is located on the thermostat housing.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the engine coolant temperature was above a threshold and closed the EGR valve to reduce the engine coolant temperature.

Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
2) Exhaust Gas Recirculation (EGR) valve operation will be disabled.
3) Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.

Conditions for Clearing the Fault Code:
1) To validate the repair, perform a key cycle, and leave the key in the ON position for 1 minute.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
4) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
When the engine coolant temperature nears the engine protection limits, the EGR valve will be closed to reduce the coolant temperature. This fault code is used as an information fault code, only indicating that the EGR valve has closed. No malfunction has occurred to cause this fault code. Other engine protection fault codes will be active if the engine coolant temperature has exceeded the engine protection limits.

Possible Causes:
1) Inactive fault codes
2) Faulty ECM

Reason:
Engine Coolant Temperature – Condition Exists. The EGR valve was closed to reduce engine coolant temperature.

Effect:
Possible reduced engine performance.

Circuit Description:
The coolant temperature sensor is a variable resistor sensor and is used to measure the temperature of the coolant of the engine. The engine control module (ECM) supplies 5 volts to the coolant temperature signal circuit. The ECM monitors the change in voltage caused by changes in the resistance of the sensor to determine the coolant temperature.

Component Location:
The engine coolant temperature sensor is located on the thermostat housing.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the engine coolant temperature was above a threshold and closed the EGR valve to reduce the engine coolant temperature.

Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
2) Exhaust Gas Recirculation (EGR) valve operation will be disabled.
3) Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.

Conditions for Clearing the Fault Code:
1) To validate the repair, perform a key cycle, and leave the key in the ON position for 1 minute.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
4) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
When the engine coolant temperature nears the engine protection limits, the EGR valve will be closed to reduce the coolant temperature. This fault code is used as an information fault code, only indicating that the EGR valve has closed. No malfunction has occurred to cause this fault code. Other engine protection fault codes will be active if the engine coolant temperature has exceeded the engine protection limits.

Possible Causes:
1) Inactive fault codes
2) Faulty ECM

Reason:
At Least One Unacknowledged Most Severe Fault – Condition Exists

Effect:
None on performance.

Circuit Description:
There is at least one unacknowledged severe fault in the system.

Component Location:
The reset button or switch location depends on the original equipment manufacturer (OEM). Refer to the OEM troubleshooting and repair manual for component location.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected a fault that has not set the lamp within a calibrated threshold.

Action Taken When the Fault Code is Active:
The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
The ECM will turn off the red STOP ENGINE lamp immediately after the diagnostic runs and passes.

Shop Talk:
This fault code occurs as a result of other fault codes becoming active or inactive. Fault Code 2661 will remain active until reset by the operator. Fault Code 2661 is designed to latch onto other fault codes that have become active or have gone inactive. The light is an indicator that will remain lit to inform the operator that there has been a fault code generated. The fault has no effect on engine performance.

Possible Causes:
1) Inactive fault codes
2) Faulty ECM

Reason:
At Least One Unacknowledged Most Severe Fault – Condition Exists

Effect:
None on performance.

Circuit Description:
There is at least one unacknowledged severe fault in the system.

Component Location:
The reset button or switch location depends on the original equipment manufacturer (OEM). Refer to the OEM troubleshooting and repair manual for component location.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected a fault that has not set the lamp within a calibrated threshold.

Action Taken When the Fault Code is Active:
The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
The ECM will turn off the red STOP ENGINE lamp immediately after the diagnostic runs and passes.

Shop Talk:
This fault code occurs as a result of other fault codes becoming active or inactive. Fault Code 2661 will remain active until reset by the operator. Fault Code 2661 is designed to latch onto other fault codes that have become active or have gone inactive. The light is an indicator that will remain lit to inform the operator that there has been a fault code generated. The fault has no effect on engine performance.

Possible Causes:
1) Inactive fault codes
2) Faulty ECM

Reason:
At Least One Unacknowledged Moderately Severe Fault – Condition Exists

Effect:
None on performance

Circuit Description:
There is at least one unacknowleged moderately severe fault in the system.

Component Location:
The reset button or switch location depends on the original equipment manufacturer (OEM). Refer to the OEM troubleshooting and repair manual for component location.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected a fault that has not set the lamp within a calibrated threshold.

Action Taken When the Fault Code is Active:
The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.

Shop Talk:
Fault Code 2662 triggers from other moderately severe fault codes that have become active or have gone inactive. Fault Code 2662 will remain active until reset by the operator. The light is an indicator that will remain lit to inform the operator that there has been a fault code generated. The fault has no effect on engine performance.

Possible Causes:
1) Inacrive fault codes
2) Faulty ECM

Reason:
At Least One Unacknowledged Moderately Severe Fault – Condition Exists

Effect:
None on performance

Circuit Description:
There is at least one unacknowleged moderately severe fault in the system.

Component Location:
The reset button or switch location depends on the original equipment manufacturer (OEM). Refer to the OEM troubleshooting and repair manual for component location.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected a fault that has not set the lamp within a calibrated threshold.

Action Taken When the Fault Code is Active:
The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.

Shop Talk:
Fault Code 2662 triggers from other moderately severe fault codes that have become active or have gone inactive. Fault Code 2662 will remain active until reset by the operator. The light is an indicator that will remain lit to inform the operator that there has been a fault code generated. The fault has no effect on engine performance.

Possible Causes:
1) Inacrive fault codes
2) Faulty ECM

Reason:
Antitheft Password Valid Indicator – Data Erratic, Intermittent, or Incorrect. Engine ignition attempt without authorization from the immobilizer anti-theft device.

Effect:
The engine will not start.

Circuit Description:
The immobilizer anti-theft device is connected to the primary engine electronic control module (ECM) through a J1939 data link network. Messages sent from the immobilizer anti-theft device are received by the Cummins® ECM and are used to control the anti-theft features. The Cummins® ECM and immobilizer anti theft device must be configured properly so that proper operation of the multiplexed components will occur.

Component Location:
The J1939 data link wiring and location of original equipment manufacturer (OEM) installed J1939 devices varies by OEM. Refer to the OEM service manual for component location.

Conditions for Running the Diagnostics:
The diagnostic runs continuously when the keyswitch in in the ON position.

Conditions for Setting the Fault Codes:
This fault code is active when the immobilizer antitheft device has not been deactivated.

Action Taken When the Fault Code is Active:
The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
The ECM will turn off the red STOP ENGINE lamp immediately after the diagnostic runs and passes.

Shop Talk:
This fault code is active when the anti-theft device has not been deactivated. The engine will not start until proper authorization has been activated.

Possible Causes:
1) Inactive fault codes
2) Faulty ECM

Reason:
Antitheft Password Valid Indicator – Data Erratic, Intermittent, or Incorrect. Engine ignition attempt without authorization from the immobilizer anti-theft device.

Effect:
The engine will not start.

Circuit Description:
The immobilizer anti-theft device is connected to the primary engine electronic control module (ECM) through a J1939 data link network. Messages sent from the immobilizer anti-theft device are received by the Cummins® ECM and are used to control the anti-theft features. The Cummins® ECM and immobilizer anti theft device must be configured properly so that proper operation of the multiplexed components will occur.

Component Location:
The J1939 data link wiring and location of original equipment manufacturer (OEM) installed J1939 devices varies by OEM. Refer to the OEM service manual for component location.

Conditions for Running the Diagnostics:
The diagnostic runs continuously when the keyswitch in in the ON position.

Conditions for Setting the Fault Codes:
This fault code is active when the immobilizer antitheft device has not been deactivated.

Action Taken When the Fault Code is Active:
The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
The ECM will turn off the red STOP ENGINE lamp immediately after the diagnostic runs and passes.

Shop Talk:
This fault code is active when the anti-theft device has not been deactivated. The engine will not start until proper authorization has been activated.

Possible Causes:
1) Inactive fault codes
2) Faulty ECM