Using the Message Display to Display Event and Diagnostic Code Information
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| Illustration 1 | g03412481 |
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Message Display for accessing diagnostic or event information (1) "Four way" button (2) OK button (3) "Back to previous screen" button (4) Main Menu Button (5) Display | |
Event and diagnostic codes alert the operator or technician that an abnormal operating condition exists in one of the machine systems.
When an ECM activates an event or diagnostic code, the operator or the technician will be alerted by the Message Display. Most active events will be logged by the ECM. Some events are active only. Active only events are not logged. Diagnostic codes are also either logged or active. All event and diagnostic codes can be viewed with the following:
- Message Display
- Cat® Electronic Technician (Cat ET)
Accessing the Diagnostic and Event Menus
The monitoring system displays event codes and diagnostic codes in the service menu. The diagnostic codes and event codes are reported by the ECM.
Access the service menu by using the following steps:
- Go to the main menu by pressing the menu button (4).
The main menu (5) will appear on the display module.
- Scroll to "Service" with the 4-way button (1).
- Press the "OK" button (2) in order to view the service menu.
- Scroll and select "Diagnostic " using the 4-way button (1).
- Access the diagnostic mode with the "OK" button (2) from the service menu.
The events, active codes, and logged codes will now be displayed.
View the codes and events in more detail by pressing the "OK" button (2) again.
View all codes and events on the list by pressing the 4-way button (1).
- Press the main menu button (4) in order to "Exit" the service menu.
For event codes, each line in each list shows the following:
- Component Description
- Warning Level
The text message for the diagnostic codes will include the following:
- The reporting ECM (MID)
- Identity of the component that has failed (CID)
- An explanation of the failure
- Number of occurrences
- The time (service hour) of the first occurrence
- The time of the last occurrence of the code or event
- The status of the code
Note: The Diagnostics code option may be viewed at any time. Logged codes cannot be cleared until the technician has successfully entered the Four Digit Machine Password. Refer to Service Manual, UENR3162, "621H, 623H, 627H Wheel-Tractor Scraper Monitoring System" for additional information.
Indications and System Response
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| Illustration 2 | g03715122 |
The warning indicators for the subsystem on the Message Display may illuminate when an Event Identifier (EID) is activated. When a specific Component Identifier (CID) or Event Identifier is active, different notifications will be annunciated depending on the warning level of the CID or EID.
Level 1 diagnostics/events provide a mixture of illuminated indicators and messages on the display menu. Some Level 1 diagnostics/events do not provide any indication that they are active.
The action Indicator flashes red when a Level 2 warning or Level 3 warning is active.
The action alarm is driven as an output directly from the Message Display. If a Level 3 warning is active, the action alarm sounds a tone that is pulsing. The action alarm sounds these tones to alert the machine operator that immediate action is required.
If two warnings of a different level are active at the same time, the highest level warning will be displayed.
Using AVSpare Electronic Technician to Determine Diagnostic Codes
Connect the Cat® Electronic Technician to the machine. Turn the Key Start switch to the ON position. Start the Cat ET. The Cat ET will initiate communications with the Electronic Control Modules on the machine. After communication has been established, the Cat ET will list the Electronic Control Modules. Choose the desired Electronic Control Module. After the diagnostic codes have been determined with the Cat ET, see the test procedure for the corresponding diagnostic code.
Reference: Troubleshooting, "Service Tools"
Active Diagnostic Codes
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| Illustration 3 | g02625416 |
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Typical Cat ET screen for Active Diagnostic codes | |
The following procedures may cause new diagnostic codes to be logged. Therefore, before any procedures are performed, make a list of all the active diagnostic codes to determine the system problems. Clear the diagnostic codes that were caused by the procedure, when each procedure is complete.
Note: Before performing a procedure, always check all the circuit breakers. Repair the cause of any circuit breaker that is tripped.
A screen is provided in Cat ET for active diagnostic codes. The screen will display diagnostic information that is active according to the ECM. Active diagnostic information shall include a component identifier (CID), a failure mode identifier (FMI) and a text description of the problem.
Logged Diagnostic Codes
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| Illustration 4 | g02625437 |
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Typical Cat ET screen for Logged Diagnostic codes | |
A screen is provided in Cat ET for logged diagnostic codes. The screen will display diagnostic codes that are logged. Cat ET displays information logged by the ECM. The logged diagnostic data shall include a component identifier (CID), a failure mode identifier (FMI), and a text description of the problem. Also, the logged diagnostic data shall include the number of occurrences of the problem and two time stamps. The time stamp displays the first occurrence of the problem and the time stamp displays the most recent occurrence of the problem.
Diagnostics are logged in non-volatile memory. On powerup, the ECM will clear any diagnostic codes that have not been detected or active within the last 150 hours of machine operation.