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| Illustration 1 | g00824707 |
Electronic instrument panel (1) Main display module (2) "SCROLL" switch (3) "CLEAR/MODE" switch (4) "LH/RH" switch (5) "EMERGENCY STOP" button (6) Action alarm (7) "ALARM SILENCER" switch (8) Backup ECM ready indicator (9) Backup ECM in control indicator | |
The electronic instrument panel is the center for engine control and for information about engine operation. Each component of the instrument panel is described below.
Main display module (1) - This module is the main component of the instrument panel. The module receives information from the switches, sensors and other electronic controls on the engine via the CAT Data Link. The module processes the information. The information is output to the gauge clusters and/or the action alarm.
"SCROLL" switch (2) - The main display module is capable of five different modes of operation. The "SCROLL" switch is used to display the various parameters that are within each mode. See the "Main Display Module" topic.
"CLEAR/MODE " switch (3) - This switch is used for selecting among the main display module's five modes of operation. This switch is also used for clearing information from the main display module.
"LH/RH" switch (4) - This toggle switch is used in order to display the exhaust temperature and the inlet air restriction for the left side or the right side of the engine.
"Emergency Stop" button (5) - This button is used to stop the engine quickly in an emergency situation. When this button is pressed, the fuel injection is disabled and the air shutoffs are activated.
Action alarm (6) - Annunciation of the alarm informs the operator of an abnormal operating condition or a problem with the monitoring system.
"ALARM SILENCER" switch (7) - This push button allows the operator to silence the action alarm. The switch will silence the alarm for five minutes. If the condition that initiated the alarm is not corrected within the five minute period, the alarm will sound again.
Backup ECM ready indicator (8) - This green indicator illuminates in order to indicate that the backup electronic control module (ECM) is ready for use.
Backup ECM in control indicator (9) - This yellow indicator illuminates in order to indicate that the primary ECM is no longer in control of engine operation. The backup ECM is in control.
Engine control switch - This switch is used to control the engine operation. The switch has these four positions: "AUTO", "MAN.START", "COOLDOWN/STOP" and "OFF/RESET".
"AUTO" - This position enables the operator to control the engine from a remote location.
"MAN.START" - When the switch is turned to this position, the engine will start. The engine will continue to run until the ECM receives a shut down signal.
"COOLDOWN/STOP" - This position is used for manual engine stopping. If the cooldown feature is programmed, the engine will operate for a cool down period. After the cooldown, the fuel injection is terminated in order to stop the engine. If the cooldown feature is not programmed, the engine will stop immediately. The power to the control panel is maintained when the switch is in this position.
"OFF/RESET" - When the switch is turned to this position, power is removed from the control panel. This position will also reset the system if any events have occurred. If the engine is operating, the engine is immediately shut off. This position is not recommended for normal engine shutoff.
Note: The engine control switch is mounted within the instrument panel that is located on the right side of the engine. The engine control switch is locked into the AUTO position with a pin. The operation of the engine is normally controlled through an instrument panel that is at a remote location.
Main Display Module
Indicators
The indicators illuminate in response to information that is received from the ECM via the CAT Data Link.
Note: The indicators will illuminate if a setpoint that is programmed into the monitoring system for a parameter is reached. For information on the setpoints, refer to this Operation and Maintenance Manual, "Monitoring System" topic (Operation Section).
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| Illustration 2 | g00749979 |
Indicators for the main control module (1) Active diagnostic code and engine shutdown (2) Low system voltage (3) Engine overspeed (4) Overcrank (5) Not in AUTO (6) Low engine oil pressure (7) High coolant temperature (8) Low coolant temperature (9) Low coolant level (10) Low fuel level | |
| Active diagnostic code and engine shutdown (1) - This RED indicator illuminates when any of the following conditions occur: |
- An engine shutdown is initiated by the ECM.
- A diagnostic code is active.
- An event code is active.
| Low system voltage (2) - This RED indicator illuminates if the system voltage (battery and alternator) that is supplied to the ECM is below the setpoint that is programmed. The indicator will also illuminate if the battery charger (if equipped) is not charging. |
| Engine overspeed (3) - This RED indicator illuminates when the ECM has detected an engine overspeed condition. |
| Overcrank (4) - This RED indicator illuminates if the engine fails to start within the time that is programmed for the crank cycle. If the engine fails to start within the preprogrammed amount of time, the system will terminate the starting sequence. In this case, the overcrank indicator (4) will flash. Another attempt to start the engine cannot be made until the engine control switch (ECS) is placed in the OFF/RESET position. |
| Not in AUTO (5) - This RED indicator illuminates when the engine control switch is not in the "AUTO" position. Automatic starting and stopping from a remote location is only possible when the engine control switch is in the "AUTO" position. |
| Low engine oil pressure (6) - This YELLOW indicator illuminates when the engine oil pressure is below the setpoint that is programmed at the factory. The setpoint is based on a map of minimum oil pressure versus engine speed. This value cannot be reprogrammed. |
| High coolant temperature (7) - This YELLOW indicator illuminates when the engine coolant temperature is above the setpoint. |
| Low coolant temperature (8) - This YELLOW indicator illuminates when the engine coolant temperature is below the setpoint. |
| Low coolant level (9) - This YELLOW indicator illuminates when the engine coolant level is low. The coolant level sensor is supplied by the customer. |
| Low fuel level (10) - This YELLOW indicator illuminates when the level of fuel in the tank is low. A fuel level switch with contacts that are normally closed is supplied by the customer. |
Liquid Crystal Display (LCD)
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| Illustration 3 | g00380856 |
Liquid crystal display (LCD) | |
The liquid crystal display (LCD) includes the following items:
- A row of six digits and two decimal points
- Nine symbols for units of measure
- An "X10" symbol for specific applications
- A symbol for the service hour meter
The operator can control the display of the LCD with switches that are on the instrument panel. The type of information that is displayed depends on the mode of the main display module.
Modes of the Main Display Module
The main display module has six different modes of operation. Each mode provides information about engine operation. To change the mode, push the "CLEAR/MODE" switch to the "MODE" position. Table 1 lists the modes.
| Modes Of The Main Display Module | |
| Mode | Mode Number |
| Normal | 0 |
| Numeric Readout | 1 |
| Service | 2 |
| Tattletale | 3 |
| Units | 4 |
| Harness Code | 5 |
Normal Mode (Mode 0)
This mode is used for normal engine operation. During Normal mode, the instrument panel performs the following functions:
- A self test is performed when the main display module is powered up. This indicates that the monitoring system is operating properly. See the "Self Testing" topic.
- The main display module continuously monitors the engine systems. Information for the positioning of the gauge needles is supplied by input from sensors. Most of the gauge needles indicate normal operating conditions when the needles are in the 12 o'clock position.
- If an abnormal operating condition occurs, the corresponding indicator flashes and the Action Alarm annunciates.
- If a diagnostic code is detected, "SERV CODE" appears on the LCD.
- When "RPM" is shown on the LCD, the engine rpm is displayed.
- When the symbol for the service hour meter is shown on the LCD, the sum of the hours of engine operation are displayed.
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| Illustration 4 | g00384915 |
Tachometer (1800 rpm) | |
Tachometer - This gauge indicates the engine rpm. When the LCD shows "RPM", the LCD is functioning as a tachometer. The high idle rpm and the full load rpm are stamped on the engine Information Plate.
To display the service hour meter, toggle the "SCROLL" switch.
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| Illustration 5 | g00384916 |
Service hour meter (384 service hours) | |
| Service Hour Meter - This meter indicates the total number of hours of engine operation. When the LCD shows the symbol for the hour meter, the LCD is functioning as a service hour meter. The value is continuously updated during engine operation. The ECM records the total number of service hours. |
Numeric Readout Mode (Mode 1)
Numeric Readout mode provides the operator with information about the following parameters:
- Engine load
- Fuel consumption
- Gauge readings
The information about engine load and fuel consumption is displayed on the LCD only. The gauge readings are displayed with more accuracy on the LCD.
To initiate Mode 1 operation, hold the "CLEAR/MODE" switch in the "MODE" position until "-1-" appears on the LCD.
- An identifier for the gauge will be displayed prior to a value for the parameter. The LCD will momentarily show the "GA-1"identifier. This identifies gauge 1.
- The value of the parameter will be displayed.
- When a value for a gauge is displayed, the corresponding gauge needle is active. All of the other gauge needles default to the minimum position.
Use the "SCROLL" switch to advance the display to the next parameter. The LCD will show the identifier for the gauge first. Next, the value for the parameter is displayed.
Table 2 is a list of the system identifiers that appear on the LCD and the corresponding parameters.
| Numeric Readout Mode (Mode 1) | |
| System Identifier | Parameter |
| "LOAD" | Percent of the rated rack |
| "FL-0" | Fuel consumption rate |
| "FL-1" | Total fuel consumption |
| "GA-1" | Engine oil pressure |
| "GA-2" | Coolant temperature |
| "GA-3" | System voltage |
| "GA-4" | Fuel pressure |
| "GA-5" | RH/LH Exhaust temperature |
| "GA-6" | RH/LH Air inlet restriction |
| "GA-7" | Fuel filter differential pressure (restriction) |
| "GA-8" | Oil filter differential pressure (restriction) |
| "GA-9" | Boost pressure (inlet manifold air pressure) |
| "GA-10" | Aftercooler coolant temperature |
| "GA-11" | Air inlet temperature |
| "GA-12" | Engine oil temperature |
Service Mode (Mode 2)
Note: For a list of the diagnostic codes, see the film that is supplied with the instrument panel or refer to the Service Manual, Troubleshooting module.
This mode assists service technicians with the troubleshooting of diagnostic codes. All recorded diagnostic codes can be shown on the LCD. Inactive diagnostic codes can be cleared from the main display module's memory during Mode 2 operation.
Note: An inactive diagnostic code may indicate an intermittent fault.
To initiate Mode 2 operation, hold the "CLEAR/MODE" switch in the "MODE" position until "-2-" appears on the LCD.
The following three identifiers are used to specify each diagnostic code. The identifiers are displayed on the LCD.
Module Identifier (MID) - The MID identifies the module that has generated a diagnostic code. The MID is a three-digit code that is shown on the LCD. The MID is displayed for approximately one second prior to display of the Component Identifier and Failure Mode Identifier (CID-FMI). The display continuously changes between displaying the MID and the CID-FMI.
Component Identifier (CID) - The CID identifies the component or the subsystem that has generated a diagnostic code. The CID is displayed by the first four digits of the LCD.
Failure Mode Identifier (FMI) - The FMI identifies the type of diagnostic code that has been generated. The FMI is displayed on the last two digits of the LCD. A decimal point separates the FMI from the CID. The CID and the FMI are displayed immediately after the display of the MID. The CID and the FMI are displayed simultaneously.
When Mode 2 operation is initiated, the LCD shows the first diagnostic code that is available. The diagnostic code that is shown is "on-hold". When a diagnostic code is "on-hold", the display continuously changes between the MID and the CID-FMI.
Note: When no diagnostic codes are available, "- - -" is shown on the LCD.
Use the "SCROLL" switch to advance to the next recorded diagnostic code. To reveal all of the recorded diagnostic codes, continue scrolling through the display. After the final diagnostic code has been displayed, "END" will show on the LCD.
The main display module activates a "SERV CODE" display for active diagnostic codes.
- If the diagnostic code is active, the "SERV CODE" display is on.
- If the diagnostic code is not active, the "SERV CODE" display is off.
Note: Active diagnostic codes cannot be cleared from memory.
The main display module records diagnostic codes. The diagnostic codes may remain stored for future reference or the codes can be cleared from memory. To clear a logged diagnostic code, push the "MODE/CLEAR" switch to the "CLEAR" position while the code is displayed on the LCD.
Tattletale Mode (Mode 3)
This mode is useful for monitoring the ranges of the engine systems operation. The information can be used for management and maintenance of the engine.
Note: The following information is not included with the values of the tattletale: date, time and duration of the occurrence.
The main display module records the extreme value for each engine system that is monitored. A value for a system is updated when a more extreme value occurs. These values are ignored for a short period of time after each engine start-up. This allows the engine systems to stabilize before the old values can be updated with new values.
To initiate Mode 3 operation, hold the "CLEAR/MODE" switch in the "MODE" position until "-3-" appears on the LCD.
All of the gauges will display values that have been attained for the corresponding subsystems of the engine. The highest gauge readings are for values that abnormally increase. The lowest readings are for values that abnormally decrease.
The values of the gauges can be more accurately displayed with the LCD. Advance the LCD to the first value by using the "SCROLL" switch. The instrument panel will show the following displays:
- An identifier for the subsystem of the engine will be displayed. The LCD will momentarily identify the gauge with a number "-GA-1-".
- The value for the tattletale will be displayed.
- The corresponding gauge needle is activated. All of the other gauge needles default to the minimum position.
Press the "SCROLL" switch again in order to review the other tattletales.
The values of the tattletales are retained until the information is cleared from the main display module's memory.
To clear an individual tattletale, push the "MODE/CLEAR" switch to the "CLEAR" position while the value is displayed on the LCD.
To clear all of the tattletales from the memory, push the "MODE/CLEAR" switch to the "CLEAR" position while "- -" is displayed on the LCD. After the information is cleared, all the tattletales are reset to a nominal value. Then new extreme values can be recorded.
Units Mode (Mode 4)
This mode is used to change the LCD between metric units and English units. To initiate Mode 4 operation, hold the "CLEAR/MODE" switch in the "MODE" position until "-4-" appears on the LCD.
When Mode 4 is activated, the LCD will indicate the current units.
- "SI" is displayed when metric units are selected.
- "US" is displayed when English units are selected.
To toggle the units between "SI" and "US", press the "SCROLL" switch.
Harness Code Mode (Mode 5)
Note: This mode is for use by service technicians for troubleshooting.
This mode displays a code that represents the engine configuration. An incorrect code will result in incorrect operation of the monitoring system. This could result in the generation of excessive diagnostic service codes.
To initiate Mode 5 operation, hold the "CLEAR/MODE" switch in the "MODE" position until "-5-" appears on the LCD. The code will automatically be displayed.
Warning Operation
The Caterpillar Monitoring System notifies the operator of problems with the engine systems. Warning operation begins if either of the following conditions occur:
- The main display module receives a signal that indicates an abnormal operating condition.
- The main display module detects a problem with the monitoring system.
A warning is indicated by the following occurrences:
- The appropriate indicator flashes approximately nine times per second.
- The Action Alarm annunciates. The alarm is on for one second and off for two seconds, etc.
An alarm condition will not shut down the engine. However, an alarm may precede a shutdown. An alarm indicates a serious condition that requires immediate attention. Annunciation of the alarm informs the operator of an abnormal operating condition or a problem with the monitoring system. The alarm is activated by the main display module when the following conditions occur:
- A diagnostic code is active. A diagnostic code indicates a specific problem with the electronic circuitry.
- An LED indicator on the main display module flashes.
- The monitoring system detects an active event. Events can include an alarm, a derating, and a shutdown.
Self Testing
The self test verifies that the main display module and the gauge cluster modules are operating properly. The main display module performs an automatic self test when power is supplied to the instrument panel.
The internal circuits and the outputs are automatically checked. The operator must observe the following outputs in order to determine that the outputs are operating properly:
- The indicators and the LCD are tested for approximately one second. The indicators and the LCD flash on and off.
- The Gauge Cluster modules are tested for approximately three seconds. The needles of the gauges move to half scale, to zero, and then to full scale. After the needles reach full scale, the needles return to the positions that indicate the current conditions.
- The Action Alarm annunciates one time.
After the self test, the main display module defaults to the Normal mode of operation (Mode 0).
If an output does not function properly during the self test, refer to the Service Manual. Consult your Caterpillar dealer for assistance.
Internal Switches of the Electronic Instrument Panel
Illustration 6 shows three switches that are inside of the instrument panel.
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| Illustration 6 | g00799585 |
(1) Low idle switch (generator set engines) or prelube override switch (marine engines) (2) Manual crank start switch (3) Overspeed verify switch | |
Note: Engine prelube is an optional feature.
Prelube override switch (1) - This switch is intended for use when immediate engine start-up is required. When the switch is activated, the ECM will not initiate the engine prelube prior to starting the engine. The ECM will immediately begin to crank the engine.
Manual crank start switch (2) - This switch will override any other engine controls and/or protective systems. When this switch is activated, the starting motor will crank the engine. The starting motor can be engaged even during these conditions:
- The engine control switch is in the "OFF/RESET" position.
- The ECM has completed the cycle crank.
- The ECM has completed a remote shutoff.
Switch (2) is used for troubleshooting, for maintenance, and for starting the engine when the backup ECM is in control. DO NOT use this switch for normal engine operation.
Overspeed verify switch (3) - When this switch is activated, the ECM will cause an engine shutdown at 75 percent of the setpoint for the overspeed shutdown. The switch is used for verifying that the overspeed protection system is operating properly and for troubleshooting.