The override parameters screen has multiple overrides. The parameters control various functions on the engine and Clean Emissions Module (CEM). These functions and features allow the technician to troubleshoot different engine systems.
- Connect to Cat ET.
- Select the appropriate ECM.
- Select the "Diagnostics" tab.
- Select the "Diagnostic Tests" tab.
- Select the "Override Parameter" tab.
Override Parameters Listed in the Engine ECM Menu
This override is used to turn off the fuel injector circuits in order to stop the engine from running.
The purpose of this screen is to show all of the active diagnostic codes.
- Connect to Cat ET.
- Select the appropriate ECM.
- Select the "Diagnostics" tab.
- 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 this engine. Refer to the Troubleshooting guide.
This tab is currently not available for this engine. 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 appropriate ECM.
- Select the "Diagnostics" tab.
- 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 this engine. Refer to the Troubleshooting guide.
This tab is currently not available for this engine. 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 appropriate ECM.
- Select the "Diagnostics" tab.
- Select the "Events" tab.
- 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 appropriate ECM.
- Select the "Diagnostics" tab.
- Select the "Events" tab.
- 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 this engine. Refer to the Troubleshooting guide.
This tab is currently not available for this engine. Refer to the Troubleshooting guide.
Cat ET diagnostic tests are listed below.
- Connect to Cat ET.
- Select the appropriate ECM.
- Select the "Diagnostics" tab.
- Select the "Diagnostic Tests" tab.
Diagnostic Tests Listed in the Engine ECM Menu
The purpose of the injector solenoid test is to diagnose injector wiring and injector solenoid functionality.
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.
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.
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.
Cat ET calibrations are listed below.
- Connect to Cat ET .
- Select the appropriate ECM.
- Select the "Service" tab.
- Select the "Calibrations" tab.
Calibrations Listed in the Engine ECM Menu
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.
Caterpillar 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 1 you can see each injector that falls in the box is a good injector that passed the tests.
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| Illustration 1 | g02157706 |
In Illustration 2 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 2 | g02157717 |
Note: If the injectors fall outside of the main window, the injectors are scrapped.
- Connect to Cat ET .
- Select the appropriate ECM.
- Select the "Service" tab.
- Select the "Dyno Mode" tab.
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.
- Select the "Dyno Mode" tab.
- Select "Enable" to enable dyno mode.
- Return to the "Service" tab.
- Select the "Service Procedures" tab.
Show/hide table
Illustration 3 g03147687 - Select the power train "Protection Reset" (Available on select models).
Show/hide table
Illustration 4 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 5 | g03137154 |
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| Illustration 6 | g03137153 |
Snapshots allow viewing of data in Cat ET approximately 9.5 seconds before and 3.5 seconds after the diagnostic trouble code was recorded.
- Select the "Information" tab. Select the "Snapshot" tab, then select the "Viewer" tab.
Show/hide table
Illustration 7 g03137100 - Select the diagnostic trouble code to be viewed. Select "View Data".
Show/hide table
Illustration 8 g03137099 - Select a group or select "Temporary Group"
Show/hide table
Illustration 9 g03137098 - Select the channels to view and add the channels to the group. Select "OK".
Show/hide table
Illustration 10 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.
Show/hide table
Illustration 11 g03137095 - Select the "View Graph" tab for graphic illustrations. Select the channels you want to view, and select "OK".
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| Illustration 12 | g03137092 |
Tab Functions At Bottom of Screen
This tab pulls up the histogram menu.
This tab is currently not available for this engine.
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 13 | g03137091 |
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The total amount of occurrences. | |
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| Illustration 14 | g03137090 |
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The amount of engine hours operated at indicated inlet temperature. | |
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| Illustration 15 | g03137088 |
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The amount of engine hours operated at indicated coolant temperature. | |
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| Illustration 16 | g03137087 |
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The amount of engine hours operated at indicated engine speed. | |
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| Illustration 17 | g03137086 |
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The amount of engine hours operated at indicated intake manifold air temperature. | |
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| Illustration 18 | g03137084 |
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The amount of engine hours operated at indicated intake manifold pressure. | |
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| Illustration 19 | 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 20 | 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 21 | 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 the high exhaust temperature will derate the engine in order to protect the engine system. This action is normal under most circumstances and no additional troubleshooting is necessary. | |
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| Illustration 22 | 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 turbocharger overspeed. In other words, the turbocharger has to work harder to maintain the desired boost pressure. This action is normal under most circumstances and no additional troubleshooting is necessary. | |