The override parameters screen has multiple overrides. The parameters control various functions on the engine and CEM. These functions and features allow the technician to troubleshoot different engine systems.
- Connect to Cat ET.
- Select engine Engine Control Module (ECM)
- Select the Diagnostics tab.
- Select the Diagnostic Tests tab.
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Illustration 1 g03136981 - Select the Override Parameter tab.
Engine Exhaust Manifold Bank #1 Flow Balance Valve Solenoid Override
This override will energize the exhaust balance valve solenoid to on or off. This override will be used when troubleshooting the exhaust balance valve.
Aftertreatment #1 Fuel Injector Heater Override
This override activates the output for the heated nozzle in order to clean the nozzle. The output remains activated for approximately 1 hour. The engine coolant temperature must be greater than
N/A
This override is used to activate the ether injection solenoid circuit to ensure that it is working properly. The ether canister must be removed during testing of the ether solenoid circuit.
Aftertreatment Fuel Pump Relay Override
This override will allow the CRS pump to provide fuel to the CEM. This override will be used when pressure testing the CRS pump.
ARD Fuel Flow Diverter Actuator Override
This override is used to cycle the position of the diverter valve on the CRS pump. The diverter valve changes the path of the fuel between the engine and the CEM.
DPF Differential Pressure Line Override
This override when Activated, will ignore any fault code from the DPF Delta P sensor. This override will be used when using the DPF crack detection procedure.
ARD Air Pressure Control Position Override
The ECM sends a command to the ARD air valve to open to a specified percentage. The override is used to check the operation of the valve while disassembled.
System Troubleshooting Settings
The "System Troubleshooting Settings" screen will allow overrides to be enabled. The overrides will remain active even if the screen is exited.
- Connect to Cat ET.
- Select the Diagnostics tab.
- Select the Diagnostic Tests tab.
- Select "System Troubleshooting Settings".
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Illustration 2 g03146182 - Select the appropriate tab.
Aftertreatment #1 Ignition Transformer Primary Override
This override will energize the CRS spark system to on or off. This override will be used when troubleshooting the ARD ignition system.
This override will allow the user to perform a regeneration that is similar to the operator using the force switch.
Note: This override does not have any enhanced diagnostic ability. All regeneration system troubleshooting should utilize the service tests and not this override.
This override will allow the user to disable the injectors from activating when performing certain troubleshooting procedures.
The purpose of this screen is to show all of the active diagnostic codes.
- Connect to Cat ET.
- Select the Diagnostics tab.
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Illustration 3 g03146216 - Select the Active Diagnostic Codes tab.
Tab Functions At Bottom of Screen
This tab will reset all of the active codes.
This tab is currently not available for Tier 4 engines. Refer to the Troubleshooting guide.
This tab is currently not available for Tier 4 engines. Refer to the Troubleshooting guide.
The purpose of this screen is to show all of the logged diagnostic codes.
- Connect to Cat ET.
- Select the Diagnostics tab.
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Illustration 4 g03146741 - Select the Logged Diagnostic Codes tab.
Tab Functions At Bottom of Screen
This tab will clear specific codes when highlighted.
This tab will clear all logged diagnostic codes.
This tab is currently not available for Tier 4 engines. Refer to the Troubleshooting guide.
This tab is currently not available for Tier 4 engines. Refer to the Troubleshooting guide.
The purpose of this screen is to show all of the active event codes.
- Connect to Cat ET.
- Select the Diagnostics tab.
- Select the Events tab.
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Illustration 5 g03146780 - Select the Active Events tab.
Tab Function At Bottom of Screen
This tab will reset all of the active codes. Some of the event codes will "latch" to active status. Repairing the system will not "unlatch" the event codes and the event codes must be reset with Cat ET.
The purpose of this screen is to show all of the logged event codes.
- Connect to Cat ET.
- Select the Diagnostics tab.
- Select the Events tab.
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Illustration 6 g03146802 - Select the Logged Events tab.
Tab Functions At Bottom of Screen
This tab will clear specific codes when highlighted.
This tab will clear all logged diagnostic codes.
This tab is currently not available for Tier 4 engines. Refer to the Troubleshooting guide.
This tab is currently not available for Tier 4 engines. Refer to the Troubleshooting guide.
Cat ET diagnostic tests are listed below.
This is a diagnostic test to initiate an ARD fuel system air purge sequence to remove any air trapped in the system after assembly or repair/service in the field that can introduce air into the system.
The test allows a quantity of fuel to flow through the ARD fuel supply lines by enabling the electric priming/ARD fuel pump, and activating the pilot and main fuel valves until it senses that there is consistent and adequate fuel pressure on the main and pilot fuel control pressure signals.
The purpose of the injector solenoid test is to diagnose injector wiring and injector solenoid functionality.
- Connect to Cat ET.
- Select the Diagnostics tab.
- Select the Diagnostic Tests tab.
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Illustration 7 g03146818 - Select the Injector Solenoid Test tab.
This test identifies an open circuit or a short circuit in the circuit for the injector solenoids. The test activates the injector solenoids one at a time while the engine is not running. A good solenoid will create an audible click when the solenoid is activated. Cat ET indicates the status of the solenoid as "OK", "Open", or "Short".
The cylinder cutout test allows one cylinder or multiple cylinders to be cut out. The cylinder cutout test is useful when troubleshooting poor engine performance or a suspected injector failure
- Connect to Cat ET.
- Select the Diagnostics tab.
- Select the Diagnostic Tests tab.
- Select the Cylinder Cutout Test tab.
The cylinder cutout test disables the injector by not providing the injector pulse to the solenoid. The cylinder cutout test can be performed on one injector or multiple injectors at once.
The purpose of the Wiggle Test is to detect intermittent electrical faults in electronic control systems. The Wiggle Test function allows the user to determine if there is an intermittent wiring problem. The test will indicate (by changing the value reading) which parameter moved beyond a predetermined range while wiggling the wiring harness, sensor, or connector.
- Connect to Cat ET.
- Select the Diagnostics tab.
- Select the Diagnostic Tests tab.
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Illustration 8 g03146838 - Select the Wiggle Test tab.
This test requires that the engine is OFF and the key switch is in the ON position (or ECM energized and 0 engine speed). If the engine is started with the wiggle test active, the wiggle test will abort.
The Wiggle Test will reduce all ECM requirements to trip fault codes, making the diagnostics sensitive. Under normal operation some fault codes need multiple occurrences before the code will log. But during this test the fault codes will trip the first time.
The mechanic wiggles and shakes the wiring to see if codes go active. An audible alarm is also activated if the ECM sees any parameter change state electrically. Once the test has ended, the ECM returns to normal diagnostic state.
The high-pressure fuel pump contains two assemblies for pressurizing fuel. Each assembly contains a solenoid. This test checks each solenoid to make sure that the solenoids are working properly.
- Connect to Cat ET.
- Select the Diagnostics tab.
- Select the Diagnostic Tests tab.
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Illustration 9 g03146848 - Select the Fuel Rail Pump Solenoid Test tab.
During the Fuel Rail Pump Solenoid Test, the ECM pulses 105-volt to each solenoid. The pulses are sent at the proper time and for the correct duration for a given engine load and speed. The ECM monitors the current flow through the circuit for each solenoid. If the current flow is too high or too low, the ECM activates one of the following diagnostic codes:
- 1779-5 Fuel Rail Pump #1 Output Current Below Normal
- 1779-6 Fuel Rail Pump #1 Output Current Above Normal
- 1780-5 Fuel Rail Pump #2 Output Current Below Normal
- 1780-6 Fuel Rail Pump #2 Output Current Above Normal
The Fuel System Verification Test compensates for wear of the internal components of each injector over a time. Internal component wear contributes to lower volumes of fuel being delivered into the cylinder. Injector wear also increases the amount of leakage past each injector back to the fuel tank. This test evaluates the health of each injector.
- Connect to Cat ET.
- Select the Diagnostics tab.
- Select the Diagnostic Tests tab.
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Illustration 10 g03146891 - Select the Fuel System Verification Test tab.
The engine ECM determines whether the injector is delivering the correct volume of fuel into the cylinder. Also the engine ECM determines if the injector is delivering a low volume of fuel into the cylinder based on Valve Closing Time. Valve Closing Time is the difference between the time the engine ECM stops sending current to the injector solenoid and the time the valve takes to return to the valve seat. When the test is performed, Cat ET indicates the status of each injector as "Success" or "Failed".
Note: Perform the Fuel System Verification Test after an injector is replaced. Also perform when a -2 or -7 code is active.
The ARD ignition test is used when completing maintenance to the ARD system, or for diagnosing a failed ignition event, or for loss of combustion.
- Connect to Cat ET.
- Select the Diagnostics tab.
- Select the Diagnostic Tests tab.
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Illustration 11 g03147036 - Select the ARD Ignition Test tab.
The technician can initiate an ARD Ignition Test below 80 percent soot level. The test is a shortened regeneration (approx. 4 minutes). The test checks all the components of ARD system. The ARD ignition test checks the functionality of the system to verify that ignition has occurred and combustion is maintained. The ARD Ignition test also actuates the Main Fuel Solenoid (If Equipped).
The Fuel System Functional Test contains four separate tests that evaluate various aspects of the common rail fuel system. The test is a self-guided test that will advance to the next test in the series if the current test passes. If a test in series fails, the test will abort.
- Connect to Cat ET.
- Select the Diagnostics tab.
- Select the Diagnostic Tests tab.
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Illustration 12 g03147340 - Select the Fuel System Functional Test tab.
- The Fuel Pump Gear Installation Test evaluates if the high-pressure fuel pump was installed correctly.
- The Fuel Rail Low Pressure Test checks for leaks at low rail pressure. The test momentarily cuts out pumping and injection and measures the resulting rail pressure drop. The test then calculates the fuel quantity leaving the rail and compares to the expected results.
- The Fuel Rail High Pressure Test checks for fuel leaks at high rail pressure. The test momentarily cuts out pumping and injection and measures the resulting rail pressure drop. The test then calculates the fuel quantity leaving the rail and compares to the expected results.
- The Fuel Pump Flow Pump Test assesses adequate fuel pump flow. The test measures rail pressure response during a single pump event while fuel injection is disabled.
- Fuel Pump Not Timed Correctly
- Fuel Pump Flow Too Low
- Fuel Rail High Pressure Decay Too High
- Fuel Rail Low Pressure Decay Too High
This test determines if an injector is causing an engine performance problem. The ability of each injector to deliver a certain amount of fuel is tested.
- Connect to Cat ET.
- Select the Diagnostics tab.
- Select the Diagnostic Tests tab.
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Illustration 13 g03147378 - Select the Injector Fuel Delivery Test tab.
Each injector is tested at various rail pressures. This test runs for a maximum of 9 minutes. The test helps identify problems with injectors at higher rail pressures.
Method to determine the EGR System health and determine if the EGR system is functioning properly. The test will exercise the EGR valve, and check for exhaust gas flow.
- Connect to Cat ET.
- Select the Diagnostics tab.
- Select the Diagnostic Tests tab.
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Illustration 14 g03137051 - Select the EGR System Test tab.
The test is conducted with the engine running at a constant speed and load with machine/vehicle speed zero.
There are two phases to the test:
- EGR Response Test: Known conditions are established for the engine. The EGR valve is commanded from open to closed. The response is checked for the EGR Delta Pressure Sensor, EGR Absolute Pressure Sensor, and fuel quantity. Each input has a unique response time, which will be compared to a threshold. The commanded EGR valve positions are held for a fixed amount of time to allow the inputs to stabilize. This procedure is repeated several times to increase accuracy and repeatability.
- EGR Valve Sweep: Known conditions will be established for the engine. The EGR valve is swept from open to closed repeatedly to check for satisfactory response of the EGR flow.
The purpose of the ARD air system service test is to determine if the ARD air valve is controlling the airflow as commanded by the controller. This test will determine if the ARD air valve is functioning properly.
- Connect to Cat ET.
- Select the Diagnostics tab.
- Select the Diagnostic Tests tab.
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Illustration 15 g03137054 - Select the ARD Air System Service Test tab.
The ARD air valve is cycled while the ECM monitors boost and aftertreatment secondary air pressure. The ECM looks for a specific amount of drop in boost and aftertreatment secondary air pressure when the valve is actuated. The values must be higher than the threshold in order to pass the test.
ARD Nozzle Heater Circuit Test
The ARD Nozzle Heater Circuit Test allows the technician to verify that the heated nozzle and nozzle circuit are functioning properly.
- Connect to Cat ET.
- Select the Diagnostics tab.
- Select the Diagnostics Tests tab.
- Select the ARD Nozzle Heater Circuit Test tab.
The test cycles the ARD fuel nozzle heater on for 3 minutes, or until the test is aborted by the technician. The 3 minutes will give the technician time to perform an electrical check on the heater. Perform the electrical test by hooking a current probe around the heater wire to verify that the heater is getting the proper current. Engine speed must be present while this test is running to allow coolant to circulate through the ARD head. Once the current has been measured, the test can be aborted.
Cat ET calibrations are listed below.
Injector trim files calibrate each injector. The injectors are calibrated so the injectors will deliver a precise amount of fuel at the exact time needed.
- Connect to Cat ET.
- Select the Service tab.
- Select the Calibrations tab.
- Select the Injector Trim Calibration tab.
AVSpare tests each injector to verify the accuracy of the injector duration and timing. If the injectors do not pass, the injectors are not used. If the injectors do pass, trim files are created and the injectors are installed. The trim file adjusts the duration and timing of each injector, so the injectors all function the same. When new injectors are installed, the technician records the serial numbers of each injector and searches for the injectors in SIS Web. The trim files can be downloaded and stored on a pc. The technician loads the trim file for each injector into the ECM.
In Illustration 16 you can see each injector that falls in the box is a good injector that passed the tests.
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| Illustration 16 | g02157706 |
In Illustration 17 you can see that the trim files have been applied. The trim files correct the injectors back to nominal so the injectors all inject the same amount at the same time.
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| Illustration 17 | g02157717 |
Note: If the injectors fall outside of the main window, the injectors are scrapped.
Air Inlet Temperature Sensor Installation Calibration
- Click on the Service tab, select Calibrations.
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Illustration 19 g03147463 - Select Air Inlet Temperature Sensor Installation Calibration and click Start.
- Click Next and then click Accept.
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Illustration 20 g03147678 - Click Yes and the engine should be placed under a relatively high load and high engine speed operating condition. This does not necessarily have to be the highest possible load the installation could see. If loading the engine is not possible increase the engine speed to 1800 RPM.
- Enter the ambient temperature from thermocouple or hand held thermometer, then click OK. The ambient temperature must be below the Air Inlet Temperature displayed in the window. Measure the ambient temperature in the shade away from hot air flow generated from the fan. Make sure to use Celsius if Cat ET is set up in Celsius.
- The engine should be placed under a relatively high load and high engine speed for 2 minutes then click Next. If loading the engine is not possible, increase the engine speed to 1800 RPM for 2 minutes then click Next.
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Illustration 21 g03147742 - Click Yes and decrease the engine speed to low idle (600 - 700 RPM) and remove any load from the engine.
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Illustration 22 g03147748 - Enter the ambient temperature from thermocouple or hand held thermometer, then click OK. The ambient temperature must be below the Air Inlet Temperature displayed in the window. Measure the ambient temperature in the shade away from hot air flow generated from the fan. Make sure to use Celsius if Cat ET is set up in Celsius.
- Run the engine at low idle (600 - 700 RPM) and remove any load from the engine for 2 minutes and then click Next.
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Illustration 23 g03327553 - The calibration value has been calibrated. Write down the calibration so you can enter the calibration value in the configuration parameters. Next, click Accept.
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Illustration 24 g03147698 - Calibration Successful, ignore "Conditions Not Met" displayed in above window for Engine Intake Manifold Mass Flow Rate. Go to Configuration, select System Settings and enter the calibrated value into the Air Inlet Temperature Sensor Calibration. You will need Factory Passwords to program this value.
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| Illustration 18 | g03137056 |
Cat ET service procedures are listed below.
Dyno Mode is used to run an engine on a dyno without derates or diagnostic trouble codes tripping from missing machine components. Normally, while in chassis an ECM is looking for inputs from various machine components, like the transmission ECM or body ECM. Dyno Mode does not require the CEM to be installed. If the ECM does not see the inputs, the ECM assumes that something is wrong and sets a diagnostic trouble code.
- Connect to Cat ET.
- Select the Service tab.
- Select the Service Procedures tab.
- Select the Dyno Mode tab.
- Select "Enable" to enable dyno mode.
- Return to the Service tab.
- Select the Service Procedures tab.
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Illustration 25 g03147687 - Select the Powertrain Protection Reset ( Available on select models).
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Illustration 26 g03137155 - Select "Reset Protection".
The engine is installed on the dyno and the technician selects Dyno mode. Dyno mode tells the engine ECM that the engine is on a dyno and the ECM ignores all the normal inputs from the machine. Once in dyno mode, if the engine has multiple power ratings the highest rating should be selected.
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| Illustration 27 | g03137154 |
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| Illustration 28 | g03137153 |
This regeneration is used to clean 100 percent of the soot out of the DPF prior to performing a diesel particulate filter cleaning.
- Connect to Cat ET.
- Select the Service tab.
- Select the Service Procedures tab.
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Illustration 29 g03137152 - Select the Ash Service Regeneration tab.
This regeneration has a fixed length of time that the regeneration heats up the DPF and burns out soot that has built up during operation. This service procedure is done before an ash servicing has taken place, and the regeneration makes the ash cleaning more effective.
Manual Regenerations are used by the technician to regenerate the DPF and troubleshoot the aftertreatment system.
- Connect to Cat ET.
- Select the Service tab.
- Select the Service Procedures tab.
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Illustration 30 g03137150 - Select the Manual DPF Regeneration tab.
This type of regeneration lasts a minimum of 10 minutes, and soot loading is at 0 percent. If a problem is encountered during the regeneration, the diagnostics are tuned to alert the technician. This regeneration also tests the ARD nozzle for plugging by comparing desired and actual DPF inlet temperature.
The engine ash model must be reset whenever the filter is cleaned or replaced. Reseting the ash model places the DPF ash volume back to the "Clean State". The resetting will allow the regeneration of the DPF to function properly.
- Connect to Cat ET.
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Illustration 31 g02477962 - Select "Service" from the top menu and highlight "Service Procedures".
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Illustration 32 g02477961 - From the "Service Procedures" menu, highlight "DPF Ash Service". Select "Start".
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Illustration 33 g02495621 Show/hide table
Illustration 34 g02477958 - Select "Ash Service Reset" to start the test procedure.
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Illustration 35 g02477960 - Choose the correct replacement type of diesel particulate filter in the menu that appears. The types of replacements for the diesel particulate filter are the following:
- "Field cleaned" A filter that has been cleaned and reapplied
- "New" - A new filter replacement
- "Remanufactured" - A remanufactured filter replacement
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Illustration 36 g02495643 Show/hide table
Illustration 37 g02478024 - Once the reset is completed, a log of the reset is captured and visible as a new row of information in the DPF ash service screen. Resetting the engine ash model does not reset the soot level.
- Perform a "Manual DPF Regeneration" with Cat ET to reset the soot level
The ARD Fuel Line Flush enables the service technician to flush potential debris from the ARD fuel lines. The flushing helps to prevent the ARD nozzle from becoming plugged after being serviced.
- Connect to Cat ET.
- Select the Service tab.
- Select the Service Procedures tab.
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Illustration 38 g03137128 - Select the ARD Fuel Line Flush tab.
The ARD Fuel Line Flush allows a quantity of fuel to flow through the ARD supply lines. The flush is accomplished by enabling the electric priming/ARD fuel pump, and activating the pilot and main valve. The ECM cycles the pilot and main solenoid on for 10 seconds and off for 10 seconds. The ECM repeats the cycles four times. The pilot and main lines MUST be disconnected from the ARD head and allowed to flow fuel into a container. The container must be able to hold 5 gal of fuel for this procedure.
Note: DO NOT ATTEMPT TO RUN THIS TEST WITH THE FUEL LINES STILL CONNECTED. The DPF could be damaged.
Aftertreatment Regeneration Trigger History
Provides specific details about an aftertreatment regeneration.
- Connect to Cat ET.
- Select the Information tab.
- Select the History tab.
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Illustration 39 g03137126 Show/hide table
Illustration 40 g03137124 (1) Aftertreatment Regeneration Speed Type
(2) Aftertreatment Regeneration Trigger Type
(3) ARD Auto Regeneration Enable Status
(4) Regeneration Start Time
(5) Regeneration Trigger Service Hours
(6) Application Regeneration Readiness Status
(7) Aftertreatment Regeneration Trigger Percent Soot
(8) Regeneration End Time
(9) Regeneration Completion Service Hours
(10) Aftertreatment Regeneration End Percent Soot
(11) Aftertreatment Regeneration End Status - Select the Aftertreatment Regeneration History tab.
- (Column 1) Aftertreatment Regeneration Speed Type
The regeneration was low speed (stationary) or high speed (working).
- (Column 2) Aftertreatment Regeneration Trigger Type
What triggered the regeneration.
Service - Triggered through the ET service tool
Soot - Triggered by the ECM soot calculation
Pressure - Triggered by the DPF differential pressure sensor
Time - Triggered because a specified amount of time has elapsed since a complete regeneration occurred
- (Column 3) ARD Auto Regeneration Enable Status
What the ECM configuration file was programmed to at the time of the regeneration.
Enabled - All regeneration types are allowed
Automatic Low Speed Regeneration Only - Stationary or forced regenerations are the only regeneration types allowed
Disabled - Regeneration is disabled through Cat ET
- (Column 4) Regeneration Start Time
Displays the date and time the regeneration occurred.
- (Column 5) Regeneration Trigger Service Hours
Machine hour meter reading at the start of the regeneration.
- (Column 6) Application Regeneration Readiness Status
Status values 1 through 3 are indicative of a high speed regeneration. Status values 4 and above are indicative of a low speed regeneration.
Note: Industrial Engines will only show a status value of a 2 or a 5 in this column. Status value 5 means that low speed or high speed regenerations are allowed. Status value 2 means that only high speed regenerations are allowed.
- (Column 7) Aftertreatment Regeneration Trigger Percent Soot
The percent of soot when the regeneration was triggered.
- (Column 8) Regeneration End Time
The date and time the regeneration completed.
- (Column 9) Regeneration Completion Service Hours
The machine hour reading when the regeneration stopped. The regeneration could stop when the regeneration was successfully completed or when the regeneration was stopped by the operator.
- (Column 10) Aftertreatment Regeneration End Percent Soot
The percent of soot when the regeneration completed.
- (Column 11) Aftertreatment Regeneration End Status
What stopped the regeneration.
Unsuccessful - The regeneration did not complete or stop normally
Complete - Regen completed
Work - Machine went back to work
Off - Machine was turned off
Disabled - Operator disabled the regeneration
Snapshots allow the user to view data in Cat ET approximately 9.5 seconds before and 3.5 seconds after the time the diagnostic trouble code was recorded.
- Select the "Information" tab. Select the "Snapshot" tab, then select the "Viewer" tab.
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Illustration 42 g03137100 - Select the diagnostic trouble code to be viewed. Select "View Data".
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Illustration 43 g03137099 - Select a group or select "Tempory Group"
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Illustration 44 g03137098 - Select the channels to view and add the channels to the group. Select "OK".
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Illustration 45 g03137096 - The sliding time bar indicates when the diagnostic trouble code was recorded. Data can be viewed 9.5 seconds before and 3.5 after the time the code was recorded .
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Illustration 46 g03137095 - Select the "View Graph" tab for graphic illustrations. Select the channels you want to view, and select "OK".
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| Illustration 41 | g03137101 |
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| Illustration 47 | g03137092 |
Tab Functions At Bottom of Screen
This tab pulls up the histogram menu.
This tab is currently not available for Tier 4 engines.
This tab will clear the current histogram data for this key cycle.
This labels all bars in the graph.
This labels each bar in the graph as the mouse pointer is moved over the bar.
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| Illustration 48 | g03137091 |
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The total amount of occurrences. | |
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| Illustration 49 | g03137090 |
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The amount of engine hours operated at indicated inlet temperature. | |
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| Illustration 50 | g03137088 |
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The amount of engine hours operated at indicated coolant temperature. | |
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| Illustration 51 | g03137087 |
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The amount of engine hours operated at indicated engine speed. | |
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| Illustration 52 | g03137086 |
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The amount of engine hours operated at indicated intake manifold air temperature. | |
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| Illustration 53 | g03137084 |
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The amount of engine hours operated at indicated intake manifold pressure. | |
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| Illustration 54 | g03137083 |
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This screen is used to help understand the operator use of the disable switch and at what soot load the regenerations take place. Manual disable status 0 = regenerations allowed due to switch position. Manual disable status 1= regenerations not allowed due to switch position. | |
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| Illustration 55 | g03137081 |
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This screen is used to illustrate load percentage at the current engine speed. This screen can be helpful in understanding how the engine is being used. The screen can also be used for comparison between similar machines and/or operators. | |
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| Illustration 56 | g03137080 |
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This histogram is populated when the engine system has calculated a condition in which high exhaust temperatures are present. A fault code will not be logged when the system calculates a high exhaust temperature condition, but will activate a derate to the engine in order to protect the engine system. This is normal under most circumstances and no additional troubleshooting is necessary. Refer to Troubleshooting, "Exhaust Temperature is High" for additional information. | |
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| Illustration 57 | g03137079 |
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There are certain engine conditions that put the engine in danger of turbocharger overspeed. The engines are calibrated and certified up to a certain altitude and ambient temperature limit. If the engine is operated outside this limit, the engine is more likely to experience overspeed of the turbo. In other words, the turbo has to work harder to maintain the desired boost pressure. This is normal under most circumstances and no additional troubleshooting is necessary. | |