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Thursday, November 14, 2013

730C EJECTOR Articulated Truck/ Selective Catalytic Reduction Warning System

Selective Catalytic Reduction Warning System

The selective catalytic reduction (SCR) system is a system used to reduce NOx emissions from the engine. Diesel exhaust fluid (DEF) is pumped from the DEF tank and is sprayed into the exhaust stream. The DEF reacts with the SCR catalyst to reduce NOx and leaves a nitrogen and water vapor. The Exhaust Gas Recirculation (EGR) system cools, measures, and introduces recalculated exhaust gas into the intake manifold to aid in NOx reduction.


NOTICE
Stopping the engine immediately after the engine has been working under load can result in overheating of SCR components.Refer to the Operation and Maintenance Manual, "Engine Stopping" procedure to allow the engine to cool and to prevent excessive temperatures in the turbocharger housing and the DEF injector.



NOTICE
Allow at least 2 minutes after shutting down the engine before you turn the battery disconnect switch to OFF. Disconnecting the battery power too soon will prevent purging of the DEF lines after the engine is shut down.


Definitions

Observe the following definitions.
Self-correct - Fault condition no longer exists. An active fault code will no longer be active.
Notification - Action taken by the system to alert the operator of pending Inducement.
Inducement - Engine derates, vehicle speed limits, or other actions intended to prompt the operator to repair or maintain the emission control system.
Inducement Trigger - Fault conditions that result in activation of the inducement strategy. DEF level inducement faults have a diagnostic fault code. DEF quality fault, SCR tampering fault, SCR system fault, and EGR system faults will all have a related diagnostic fault code along with an inducement diagnostic fault code.
First occurrence - A DEF quality fault, SCR tampering fault, SCR system fault, or an EGR system fault becomes active for the first time.
Repeat occurrence - If any DEF quality fault, SCR tampering fault, SCR system fault, or an EGR system fault becomes active again within 40 hours of the first occurrence.


DEF Level Normal

Inducement Strategy for DEF Level

If the DEF level falls below 20%, an amber indicator will illuminate next to the DEF level gauge on the dash. To avoid further inducements, add DEF to the DEF tank. 
If the DEF level falls below 13.5%, a level 1 inducement event will occur. The check engine lamp and the emissions malfunction indicator lamp will illuminate. The amber indicator next to the DEF level gauge on the dash will continue to remain lit.

If the DEF level is below 7.5%, a level 2 inducement event will occur. The check engine lamp and the emissions malfunction indicator lamp will illuminate and a flashing action indicator will also illuminate. The amber indicator next to the DEF level gauge on the dash will remain lit. If the ECM is configured to "Reduced Performance" and the DEF level has reached 1%, the machine will be limited to 75% torque.

If the ECM is configured to "Reduced Performance" and the DEF tank has been emptied of all DEF, the engine will be in a level 3 final inducement. If the ECM is configured to "Reduced Time" and the DEF level is 3%, the engine will be in a level 3 final inducement. Prior to final inducement the check engine lamp and the emissions malfunction indicator lamp will illuminate, the flashing action indicator will illuminate, and an audible alarm will sound 20 seconds prior to the final inducement. The engine will be taken to low idle or will be shut down. Once shut down, the engine can be restarted for 5 minute periods at reduced speed and torque. If set to idle, the engine will idle indefinitely at reduced torque. The amber indicator next to the DEF level gauge on the dash will remain lit.

Inducement Strategy for DEF Quality, Tampering, SCR System Fault, and Impeded EGR

The emissions malfunction indicator lamp will illuminate for a fault resulting from poor DEF quality, SCR system tampering, SCR system fault, or an EGR system fault. If the fault is the result of poor DEF quality, SCR system tampering, or SCR system fault, a first occurrence will result in a level 1 inducement for a duration of 2.5 hours. The level 1 inducement will also illuminate the check engine lamp. Repeat occurrences will result in a level 1 inducement duration of 5 minutes. If the fault is the result of an EGR system fault, a first occurrence will result in a level 1 inducement for a duration of 35 hours. Repeat occurrences will result in a level 1 inducement duration of 48 minutes.

If a fault condition exists for the entire duration of inducement level 1, the strategy advances to inducement level 2. The check engine lamp and the emissions malfunction indicator lamp will illuminate and a flashing action indicator will also illuminate for a fault resulting from poor DEF quality, SCR system tampering, SCR system fault, or an EGR system fault. For poor DEF quality, SCR system tampering, and SCR system faults, the duration for a level 2 inducement is 70 minutes for the first occurrence. For EGR system faults, the duration for a level 2 inducement is 60 minutes for the first occurrence. Repeat occurrences for poor DEF quality, SCR system tampering, and SCR system faults will result in a level 2 inducement of 5 minutes. Repeat occurrences for EGR system faults will result in a level 2 inducement of 60 minutes.

If a fault condition exists for the entire duration of inducement level 2, the strategy advances to inducement level 3. The check engine lamp and the emissions malfunction indicator lamp will illuminate, flashing action indicator will illuminate, and an audible alarm will sound 20 seconds prior to the level 3 inducement. The engine will be taken to low idle or will be shut down. After the level 3 inducement you may cycle the key, which will allow 20 minutes of engine run time with full torque. After 20 minutes, the engine will be in level 3 final inducement and will allow idle only or be shut down until the issue has been resolved. Once shut down, the engine can be restarted for 5 minute periods at reduced speed and torque. If set to idle, the engine will idle indefinitely at reduced torque.
Note: Contact your Cat dealer for repairs if a fault occurs.


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