STUD 7B9504 - Caterpillar

Active Regeneration Device (ARD) Nozzle Heater Diagnostic
Issue
Code 3182-4 Aftertreatment #1 Fuel Injector #1 Heater : Voltage Below Normal clears on key cycle and does not remain an active diagnostic for Troubleshooting issue.Resolution
Changed the code to be persistent active when tripped for better Troubleshooting.Fixes
Diesel Exhaust Fluid (DEF) Tank and Coolant Temperature Kick Out
Issue
During the Aftertreatment function test, the test immediately aborts if conditions are not met.Resolution
Changed initiate requirements to allow preconditions of coolant temperature to be met then DEF conditions. If DEF conditions are not meet, the Aftertreatment function test will abort.Cooling System Capacity Test
Issue
The EGR Gas MASS Flow is unavailable in the Cooling System Capacity Test forcing technician to abort test to view EGR Gas MASS Flow.Resolution
Added Exhaust Gas Mass Flow Rate status parameter to Cooling System Capacity TestCaterpillar Regeneration System (CRS) Nozzle Heater
Issue
The CRS nozzle heater shorten cycle was causing heater nozzle plugging.Resolution
CRS nozzle heater timer resets and timer durations have been updated to correct this issue.Post Regen Main Fuel Spritz
Issue
A popping sound is noticed during the post regeneration main fuel spritz.Resolution
Spark has been disabled during the main fuel spritz action.Maintenance Timer (MTB)
Issue
Forced MTB regens with the auto regen capability disabled on applications are unable to reset the regen trigger request. This is leading subsequent regen requests without the trigger getting reset. This can lead to operator confusion in the field.Resolution
Logic was updated to go from MTB to Non-MTB at the end of the regen. This will allow the reset.Low Battery Voltage Diagnostic
Issue
False trip battery diagnostic during operator forced shutdown. This creates derate without active fault code.Resolution
Robustness of diagnostic was improved to reduce false tripping and derate issue.DPF #1 Intake Pressure Sensor Out of Calibration
Issue
False trip code 3464-13 under cold ambient temperature.Resolution
Changed the minimum DPF inlet temperature condition set point for DPF Intake Pressure Sensor Code 3464-13.SCR Inducement DEF Control Unit Faults
Issue
DCU faults were considered tampering faults which caused downtime and loss of productivity.Resolution
DCU faults have been categories into tampering and non-tampering. This new change will trigger final inducement in 20 hours and is applicable for EPA regulation.NOx Sensor J1939 Datalink Faults
Issue
Logged 5856-9 Data Link #3: Abnormal update Rate being logged.Resolution
Changed ECM request rate for NOx Sensor reading to match J1939 requests.Fuel Pressure Sensor False Trip
Issue
During sudden Engine Speed Drops or key cycle the after fuel filter pressure sensor experience momentary vacuum this created false trip of 460-21 code.Resolution
Debounce time was extended to allow sensor recover.Low Fuel Pressure Events
Issue
Level 1 low fuel pressure events are unavailable for DOC protection.Resolution
Added Level 1 low fuel pressure event.Low EGR Delta Pressure Event
Issue
False during on Low EGR delta P.Resolution
Improved diagnostics for EGR absolute pressure sensor and EGR differential pressure sensor.Exhaust Gas Recirculation (EGR) (ABS) & (DP) Sensor out of Calibration
Issue
EGR Absolute (ABS) and EGR Differential Pressure false tripping in cold ambient conditions.Resolution
Changed minimum conditions at cold ambient and zero engine speed to reduce false tripping.Level 1 Coolant Derate
Issue
Level 1 Coolant Temperature event comes up when the EGR protection derate occurs.Resolution
Separated the EGR derate from the PMS level 1 trip point. EGR