16740-ZY3-003 Honda REGULATOR ASSY., PRESSURE (Honda Code 6990196).

Table 1
Engine Sales Model Industrial Model Engine Software Aftertreatment Software
C9 Industrial ABC 556-3083 556-3084
C9 Industrial D 556-3085 556-3086
C13 Industrial ABC1 556-3067 556-3068
C13 Industrial C1C2D 556-3063 556-3064
C13 Agricultural 300 556-3061 556-3062
C13 Agricultural 340 556-3059 556-3060
C13 Agricultural 375 556-3057 556-3058
C13 Agricultural 300 Crosscut 556-3051 556-3052
C13 Agricultural 340 Crosscut 556-3049 556-3050
C13 Agricultural 375 Crosscut 556-3047 556-3048
C15 Industrial AB 556-3077 556-3078
C15 Industrial CD 556-3079 556-3080
C18 Industrial ABC1 556-3073 556-3074 Service Tool RequirementCat ® Electronic Technician ( ET) Service Tool 2018A or later required for this software release.
Changes Implemented In The Flash File
Exhaust Gas Recirculation (EGR) High Absolute Pressure Strategy
Issue
The previous software release implemented a de-rate based control strategy to protect the engine depending on the EGR absolute pressure.If the strategy cannot lower the pressure an adequate amount, then the de-rate will not be sufficient to lower EGR Pressure.These conditions result in a false tripping of a diagnostic code. This false diagnostic code will be logged which can lead to unnecessary machine servicing.Resolution
Changed the previous de-rate to a closed loop de-rate.High Crank Case Pressure Level 2 Shutdown
Issue
During a High Crank Case Pressure Level 2 Shutdown, the engine oil is sometimes pushed through the valve seals. This can blow oil through the turbocharger into the Diesel Particulate Filter (DPF) without sending a shutdown request.Resolution
A level 2 shutdown event will send an engine shutdown request if configured in service tool. The engine will be allowed to restart after shutdown event.Engine Control Module (ECM) Unable to Communicate
Issue
The ECM fails to communicate with the Cat ET service tool caused by tripped breaker, or blown fuses due to injector driver capacitor failure.Resolution
The software will turn off the injector driver circuit during 0 rpm state for applications that have continuous engine control module power. Turning off the injector driver circuit will avoid capacitor failure that can result in ECM replacement.Engine Restart Failure Without Power Cycling
Issue
Engine fuel delivery is limited on restart which can cause fail to start or no-start conditions.Resolution
The engine run timer will reset at the 0 rpm state which will activate the correct fuel delivery limits for the starting cycle.Diesel Exhaust Fluid (DEF) Concentration and Low Conversion Codes
Issue
There have been cases where both the tank refill method and continuous refill method have had a diagnostic code go active, then disappear, and the become active again over a short period.Resolution
The sensitivity and severity of the DEF concentration has been updated to address false diagnostic codes for DEF concentration and low conversion.De-Crystal Regeneration Priority over Common Rail System (CRS) Nozzle Heat Cycle
Issue
Currently the CRS nozzle heat cycles are preventing the high carbon evaporation-based Selected Catalyst Reduction (SCR) injector de-crystallization regeneration from running.The DEF injector failures occurring at early hours on Tier 4 Final in-line engine products are leading to fault codes and inducements which can cause customer downtime.Resolution
The de-crystallization regeneration will prevent a CRS nozzle heater cycle as long as there is no Nozzle Heater Event level 2.Implementation of DEF System Flow Evaluation
Issue
There was a high rate of partially blocked DEF injectors replaced under warranty.Resolution
Changed the DEF flow evaluation based on the DEF injector command and proportional change in DEF pump speed.Data Health Diagnostic Strategy Robustness
Issue
Diagnostic codes for data link communication have caused inducement to trigger and engine shutdowns.Complete loss of communication between the engine ECM and after-treatment ECM resulting in code 2348-9 SAE J1939 Data Link #2 : Abnormal Update Rate.Complete loss of communication between the after-treatment ECM and engine exhaust out NOx sensors, or between the Aftertreatment ECM and the Dosing Control Unit (DCU) resulting in code 5856-9 SAE J1939 Data Link #3 : Abnormal Update Rate.Resolution
Changed the response time for SAE J1939 Data Link #2 to allow for recovery of the datalink.Changed the response time for SAE J1939 Data Link #3 to allow for recovery of the datalink.NOx Sensor Diagnostic Robustness