ALTERNATOR GROUP 3N6592 - Caterpillar

Table 1
Diagnostic Trouble Code
J1939 Code Code Description Conditions That Must Be Present Notes
523602-0 High Frequency of Regeneration Battery voltage is normal
Key switch is in the ON position Occurs when the time between completing an active regeneration and starting another active regeneration is within a 30 minute time frame. This would need to occur for three consecutive times.
Occurs when an active regeneration occurs within a 30 minute time frame for three consecutive times.
Engine derates
EGR stops This code occurs when an active regeneration is needed within a 30 minute time frame and this occurs 3 consecutive times.The only way to change this code from active to logged is to perform the “DPF Regeneration Time Interval Reset”. Refer to “CAT ET Service Features” story in this manual for the procedure. Unlike most other engine codes, this code will not stop a regeneration.Note: If the machine is continued to operate with this code active, fuel dilution can occur. Caterpillar recommends to checking the oil level and obtain an oil sample. Change the oil and oil filter if needed.This code should be indicating a DPF that is getting full. However this could be due to a break in the wires for the DPF Differential Pressure Sensor circuit. One of the triggers for an active regeneration is high DPF Differential Pressure. Refer to the “General Information” and “Regeneration Levels of the Diesel Particulate Filter (DPF)” for more information.An intermittent fault in the wiring harness could send a faulty signal to the Engine ECM for a high differential pressure. The intermittent fault can occur without creating a logged coded. The intermittent fault is the most common cause of the 523602-0 code on low hour machines. The code must be investigated thoroughly prior to removing a DPF when this code is present. Contact the local Caterpillar Technical Communicator (TC) prior to removing a DPF when this code is present.If suspected that (523602-0) High Frequency of Regeneration is occurring due to a full DPF, then refer to the machines Operation and Maintenance Manual for the recommended cleaning interval. If the engine hours exceeds the service interval, the DPF should be cleaned.If the engine hours are less than the service interval, then consult your dealer technical communicator (TC) before removing and cleaning the DPF. If the DPF is found full on an engine with hours less than the service interval, then investigate the root cause. These include failures that result in consuming oil, such as a failed turbo or worn cylinders. These would have other symptoms like low engine oil, high oil consumption, oil sample with high wear metals.Other causes are not using Ultra Low Sulfur Diesel or not using low ash engine oil. Refer to the machines Operation and Maintenance Manual for approved engine oils.Note: After making the appropriate repairs, the “DPF Regeneration Time Interval Reset” in CAT ET under the service tab must be performed to change the 523602-0 from an active code to a logged code. Refer to “Cat ET Service Features” for more information.