The Caterpillar Electronic Technician (ET) can be used to monitor some parameters of the ECM.
A pyrometer can be used for monitoring the exhaust system.
Sensors are used in order to monitor engine operation. Wiring harnesses connect the sensors to the control modules. The ECM uses information from the sensors for monitoring and for controlling the engine. If an abnormal occurrence is detected, the information is also used to generate warnings, shutdowns, and diagnostic codes.
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| Illustration 1 | g01245287 |
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(1) Advisor monitor display
(2) "MANUAL PRELUBE" switch and "PRELUBE ACTIVE" indicator (3) Connector for the electronic service tool (4) "EMERGENCY STOP" button (5) Engine control switch (6) "DESIRED SPEED" dial | |
The "MANUAL PRELUBE" switch (2) will cause the prelube pump to operate until the switch for prelube oil pressure closes. When the output is activated, the "PRELUBE ON" indicator on the optional control panel is illuminated.
Connector (3) is for the Cat (ET).
"EMERGENCY STOP" button (4) is used to stop the engine in an emergency situation. When the button is pressed, the control module shuts off the fuel via the gas shutoff valve. The module also terminates the ignition.
The "EMERGENCY STOP" button and the mode control switch must be reset before the engine will start. To reset the "EMERGENCY STOP" button, turn the button clockwise. To reset the mode control switch, turn the switch to the OFF/RESET position.
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Only use the "Emergency Stop" button in order to stop the engine in an emergency situation. Do not use the "Emergency Stop" button for normal engine stopping. To prevent damage to the engine, use the mode control switch or use the remote start/stop initiate contact for normal engine stopping. |
Note: More than one "EMERGENCY STOP" button may be available for use.
Engine control switch (5) is used to control engine start-up and engine stopping.
Dial (6) is used to set the engine at the desired rpm.
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| Illustration 2 | g01245299 |
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(7) "Engine failure"
(8) "Left/Up" (9) "Active Alarm" (10) "Right/Down" (11) "Engine on" (12) "Previous" (13) Spare (14) "Home" (15) Spare (16) "OK/Select" | |
Advisor monitors the engine operations, diagnostic events, service intervals, and modes of operation. Advisor is used to change customer preferences and operation parameters. This allows additional means for the operator to increase engine efficiency.
If an action alarm, alert indicator, or warning occurs, the message will override any screen that was displayed on the Advisor monitor display.
"Engine Failure" (7) - This button will illuminate in the event of an engine failure.
"Left/Up" (8) - This button is used for the following purposes: navigating backward through the screens, navigating upward through the screens, entering data information and a decrease in a setting value.
"Active Alarm" (9) - This button will illuminate when an alarm is active.
"Right/Down" (10) - This button is used for the following purposes: navigating forward through the screens, navigating downward through the screens, entering data information and an increase in a setting value.
"Engine On" (11) - This button will illuminate when the engine is running.
"Previous" (12) - This button is used to return to the previous screen.
Spare (13) - This is a spare button.
"Home" (14) - This button will return you to the main menu.
Spare (15) - This is a spare button.
"OK/Select" (16) - This button is used to make selections on the screen. Also, use this button to confirm an password entry or use the button to save an operator profile.
Monitoring with Electronic Service Tools
The Cat ET will display diagnostic codes that are generated by the ECM. Cat ET can also be used to display the status of some parameters during engine operation.
The engine has a digital pyrometer.
The engine Electronic Control Module (ECM) and the Advisor receive data about the engine's exhaust temperatures. The temperatures are monitored with thermocouples that are connected to an exhaust temperature module. The module broadcasts the data to the ECM and to the Advisor via a CAN data link.
Note: For information on the exhaust temperature module, refer to Systems Operation/Testing and Adjusting, KENR5473, "251-9430 and 251-9450 Exhaust Temperature Modules".
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| Illustration 3 | g00763451 |
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Pyrometer | |
The pyrometer is an electronic scanner for exhaust temperatures. The scanner can monitor 24 points via standard type K thermocouples. An LCD displays the number of the channel and the temperature in °C or °F. The scanner has two switches that can be wired to alarms or relays. The scanner can provide readings, monitoring, and alarms for the temperatures of 20 cylinder exhaust ports and four turbocharger inlets and/or outlets.
The scanner has a microprocessor for processing the input signals. The microprocessor has non-volatile memory for storing programmable parameters and other data. The user interface is a keypad. The following functions are among the uses of the keypad:
- Change the display of the temperatures to °C or °F.
- Select automatic display or manual display for the scan.
- Display a history of channels which have exceeded the setpoints.
- Change the filter for the display in order to stabilize the readings for a signal that is fluctuating.
- Program the temperature setpoints.
- Lock the keypad in order to help prevent changing of the non-volatile memory.
- Calibrate the scanner.
The scanner can monitor temperatures from
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| Illustration 4 | g00764232 |
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Keypad | |
Note: Certain functions of the keypad can be locked in order to prevent changes to the scanner's non-volatile memory.
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"VIEW ALARMS" - This key enables the operator to perform the following activities: |
- View the status of the input for engine rotation.
- Review the log of the highest cylinder temperature.
- View the log of the channels that have exceeded the setpoints.
- Clear the logs.
The logs are helpful in determining the maximum cylinder temperature that has been reached and the thermocouples that have been responsible for activating an alarm.
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"SETUP" - This key is used to configure the scanner for the particular installation. |
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"RESET" - This key acts as a reset for the scanner. The "RESET" key enables the operator to reset the scanner if an alarm occurs. The key is used to clear the output switches. |
The "RESET" key can also reset the start-up timer.
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"ENTER/ACK" - This key is used for several functions. |
Save new data or a new configuration in non-volatile memory.
Acknowledge an active alarm.
Cancel the start-up timer.
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"SETPTS" (setpoints) - This key is used to view each of the six setpoints for the alarms. The key is also used to change the setpoints. When the key is pressed, the description of each setpoint and the temperature of the setpoint is displayed. |
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"ESC" (escape) - This key can be used at any time to return to the normal display. If the "ESC" key is pressed during programming, the revised values are discarded. The configuration returns to the saved values and the normal display is resumed. |
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Up Arrow and Down Arrow - These keys are used for several different functions. |
- During normal operation, each press of the up arrow key increments the channel one at a time. The down arrow key decreases the channel.
- Scroll through the selections in the setup mode.
- Change the values for the filter.
- Change the values of setpoints.
- Calibrate the scanner.