4/3/24, 08:08 SIS 2.
Determining Diagnostic Trouble Codes (M0082989-21)
SMCS - 0785, 7490, 7569 i08193166
GRADE System on the Next Generation Excavators
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Monitor display
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(1) Touch screen
(2) Beeper
(3) Main connector
(4) Main menu (Grid) option
(5) Side menu option
The machine monitor display contains many applications, options, and functionality. The machine
monitor displays allow interaction with many of the machine system ECMs connected to the 2D
GRADE System. The monitor will provide wide variety of system menu options including the
following:
Setting
Calibration
Viewing and changing some system parameters
Monitoring system components values and dimensions in real time
Viewing and clearing an active or logged events and diagnostics code
Determining Diagnostic Trouble Codes
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Using the Machine Monitor to Determine Diagnostic Trouble Codes
Illustration 2 g06245827
Monitor display
The machine monitor display will display the active and logged diagnostics and events in real time.
The active and logged diagnostics and events will appear in the upper bar of the display. The
"Diagnostics" menu allows the technician to view the active, logged diagnostics and events list from
the machine ECM. The diagnostics menu will also provide detail information of the codes.
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Illustration 3 g06245828
Monitor display - navigation to diagnostics screen
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Illustration 4 g06245829
Monitor display - navigation to diagnostics screen
To view the active and logged diagnostics and events from the display:
1. Select and press the "Main menu" (grid) option on the bottom-right corner of the main display
screen.
2. Select and press the "Setting" menu option from the "Apps" menu list selections options.
3. Acknowledge and accept the warning on the "Setting" menu option.
4. Select and press "Service" menu option.
5. Enter the service menu password then press "Enter" to enter the service menu option list.
6. Select the "Diagnostics" menu option from the Service menu selection list.
The "Diagnostics" menu option allows the technician to view the following:
A - Active Diagnostics Codes
B - Logged Diagnostics Codes
C - Active Event Codes
D - Logged Event Codes
Pressing any of the above "Diagnostics" menu options (A, B, C, or D) will display the list of the
codes that was selected.
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Illustration 5 g06245830
Event code screen
Pressing any of the displayed active or logged diagnostics or event list will display the following
information about the code that was selected:
Module ID Name (ECM) that logged or registered the code error
The selected code Components ID number or the Event Identifier (EID)
The Failure Mode Identification (FMI) number of the selected code
Brief description of that code error
The Warning Category Indicators (WCI) number of that code error
The first and last time that code error occurred
The number of occurrences of that code error
The diagnostics active or logged diagnostics or event codes error can be viewed, deleted, or saved
from the selected "Diagnostics" menu options. Select and press the error code to view the
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described information about the active or logged diagnostics or event codes error. Press the "Back"
menu option to return back.
The following list contains some of the functions of the display module:
The diagnostic codes of the ECM systems are displayed.
The settings for the ECM are displayed.
The machine status parameters are shown in real time.
The number of occurrences and the clock hour of the first and last occurrence are displayed for
each of the events, active codes, and logged codes.
The definition for each logged diagnostic code and each event is displayed.
Troubleshooting Procedures
The diagnostic codes can be viewed with the Display Module or Cat® Electronic Technician (ET).
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. When each procedure is complete, clear the diagnostic codes that were caused by the
procedure.
Note: Before performing a procedure, always check all the circuit breakers. Repair the cause of any
circuit breaker that has tripped.
Event Identifier (EID)
An Event indicates a reading that is outside of normal operating ranges but within component limits.
An example might be a high oil temperature reading. The event will be identified by the ECM, the
EID, and a time stamp.
Component Identifier (CID)
The Component Identifier is a four-digit number that represents a particular component on the
machine. For example, each solenoid that is connected to the Machine ECM has an assigned
number.
Failure Mode Identifier (FMI)
The codes for the Failure Mode Identifier are defined by SAE standards. The following list contains
a Caterpillar version of definitions.
Table 1
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Failure Mode Identifier
FMI Description of Failure Potential Cause
0 -
1 Not Used on CDL
Data Erratic, Intermittent or
2 Short to battery, Short to Ground, or Open Circuit
Incorrect
3 Voltage Above Normal Short to battery
4 Voltage Below Normal Short to ground or Open Circuit
5 Current Below Normal Open Circuit
6 Current Above Normal Short to Ground
Mechanical System Not Responding
7
Properly
Abnormal Frequency, Pulse Width, Failed Component, Short to Battery, Short to
8
or Period Ground, or Open Circuit
Failed Component, Short to Battery, Short to
9 Abnormal Update Rate
Ground, or Open Circuit
Failed Component, Short to Battery, Short to
10 Abnormal Rate of Change
Ground, or Open Circuit
11 Failure Mode Not Identifiable
12 Bad Device or Component
13 Out of Calibration
14 Special Instruction
19 Received Network Data In Error
Failed Component, Short to Battery, Short to
20 Data Drifted High
Ground, or Open Circuit
21 Data Drifted Low
Refer to Operation and Maintenance Manual, M0082987 , "Cat® 2D and 3D GRADE System for
Next Gen Hydraulic Excavators."
Using the 3D GRADE Display (TD520) for
Troubleshooting System Components
The 3D GRADE display machine status displays the status of the machine system components in
the 3D system and some of the 2D GRADE system components. The TD520 GRADE display
communicates with the EC520 ECM over the Ethernet wires. The EC520 ECM communicates with
the machine ECM over the CAN 1 bus to obtain all the required 3D system data.
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Machine Status
Illustration 6 g06243234
TD520 GRADE display
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System status screen
"Machine Status" menu option will display the 3D system components communication status. These
data are obtained from the EC520 ECM.
GNSS Receiver - Left
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Illustration 8 g06252574
GNSS receiver-left menu
"GNSS Receiver - Left" menu will display the 3D system left - Global Navigation Satellite System
(GNSS) receiver communication status with the EC520 ECM. "GNSS Receiver - Left" menu will
also display the configuration status, the model, and the application version.
GNSS Receiver - Right
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Illustration 9 g06252580
GNSS receiver-right menu
"GNSS Receiver - Right" menu will display the 3D system right - GNSS receiver communication
status with the EC520 ECM. "GNSS Receiver - Right" menu will also display the configuration
status, the model, and the application version.
Machine Radio
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Illustration 10 g06252753
Machine radio menu
"Machine Radio" menu will display the 3D system machine radio communication status with the
EC520 ECM. "Machine Radio" menu will also display the configuration status, the model,
application version, band, frequency, wireless mode, dual-band, and other band.
System ECM (EC520)
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Illustration 11 g06252754
System ECM menu
"System ECM" (EC520) menu will display the 3D system ECM EC520 communication status with
machine ECM. "System ECM" (EC520) menu will also display the configuration status, model, and
the application version.
Display Technician User Interface (Web Interface)
The display Technician User Interface (Tech UI) provides access to view and change any of the
following:
System configurations
Setting
Calibration related to the 3D Cat GRADE system
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Illustration 12 g06252770
Machine summary screen
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Main Menu of the Tech UI web interface
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Onboard devices screen
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Correction source
The Tech UI web interface can also be used for troubleshooting the 3D system by viewing the
system and 3D on-board components status.
Using Cat® Electronic Technician (ET) to Determine
Diagnostic Trouble Codes
1. Connect Cat® Electronic Technician (ET) service tool to the ET port on the machine.
2. Turn the key switch to the RUN position.
3. Start the Cat ET software on the laptop. Cat ET will initiate communications with the Electronic
Control Modules (ECM) on the machine. After communication has been established, Cat ET will
list the ECMs that are used on the machine.
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Cat ET screen
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4. From the "File" menu, choose "Select ECM". Choose the desired ECM to view the diagnostic
codes associated with that ECM.
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Cat ET screen
5. Choose from either "Active Diagnostic Codes" or "Logged Diagnostic Codes".
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Illustration 18 g06244469
Typical Cat ET screen for active diagnostic trouble codes
Illustration 19 g06244476
Typical Cat ET screen for logged diagnostic trouble codes
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6. Review the code list. Active diagnostic information includes a component identifier (CID), a
failure mode identifier (FMI), and a text description of the problem. The logged diagnostic code
screen includes the CID, FMI, and a text description of the code. In addition, the logged
diagnostic data includes the number of occurrences, and the first and last time the problem has
occurred.
Note: Diagnostics are logged in non-volatile memory. When the machine is powered up, the
ECM clears any diagnostic trouble codes not detected or active within the last 150 hours of
machine operation.
7. After the diagnostic trouble codes have been determined using Cat ET, refer to "Diagnostic
Trouble Codes" in this manual. Find the code in the list to see which test procedure to use to
diagnose the failure.
8. Performing the test procedures may cause new diagnostic trouble codes to be logged.
Therefore, before any procedures are performed, make a list of all the active diagnostic trouble
codes to determine the system problems. Clear the diagnostic trouble codes that were caused
by the procedure when finished.
Note: Before performing a procedure, always check all circuit breakers and fuses. Repair the
cause of any tripped circuit breaker or blown fuse.
Electronic Service Tool Not Communicating with ECM
Probable Causes
Configuration for the communications adapter
J1 connectors for the other control modules
Communication adapter and/or cables
Electrical power supply to the service tool connector
Cat ET and related hardware
Electrical power supply to the ECM
Override switches
J1939 Data Link
Recommended Actions
1. Electrical Power Supply to the Service Tool Connector
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Verify that the battery voltage is present between terminal A and terminal B of the service tool
connector. If the communication adapter is not receiving power, the power light for the
communication adapter will not be on. Proceed to Test Step 2 if the power light is not illuminated.
Try turning OFF the key and shutting down Cat ET if the communication adapter is powered but is
still not communicating.
2. Communication Adapter and/or Cables
Insure all the connections are tight and dry. If you are using a 171-4401 Communication Adapter
Assembly, ensure that the firmware and software files for the adapter are the most current available.
If the firmware and the software do not match, the communication adapter will not communicate
with Cat ET. Proceed to Test Step 3.
3. Cat ET and Related Hardware
To eliminate Cat ET and the related hardware as the problem, connect Cat ET to a different engine.
If the same problem occurs on a different engine, check Cat ET and the related hardware to
determine the cause of the problem. If Cat ET and the hardware are good, proceed to Test Step 4. If
you cannot gain communications on another machine, proceed to Test Step 8.
4. J1 ECU Connectors
Check the J1 ECM connectors for the following problems:
Proper torque
Cleanliness of the terminals
Wires and terminals are properly installed into the connector.
Refer to Testing and Adjusting, "Electrical Connectors - Inspect" for additional information. Proceed
to Test Step 5.
5. Electrical Power Supply to the ECM
If the ECM is not receiving battery voltage, the ECM will not communicate. Check the electrical
power to the ECM. Proceed to Test Step 6 if there is no power to the ECM.
6. Override Switches
Verify that there are no aftermarket devices that are preventing battery voltage from reaching the
ECM. Some type of override switch is interrupting the power to the ECM if the following conditions
are true:
Communication occurs when the engine is running
No communication occurs when the engine is not running and the key switch is ON
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Try starting the engine and gaining communications. This procedure may solve the communication
problem. If the problem is not fixed, proceed to Test Step 7.
Perform the following procedure:
a. Turn the key switch to the OFF position.
b. Disconnect Cat ET.
c. Turn the key switch to the ON position.
d. Connect Cat ET.
7. J1939 Data Link
Troubleshoot the J1939 data link for possible problems. Refer to troubleshooting the "data link".
8. Configuration for the Communications Adapter
1. Access "Preferences" under the "Utilities" menu on Cat ET.
2. Verify that the correct "Communications Interface Device" is selected.
3. Verify that the correct "Port" is selected for use by the communication adapter. The most
commonly used port is "COM 1".
4. Check for any hardware that is utilizing the same port as the communications adapter. If any
devices are configured to use the same port, exit or close the software programs for that
device.
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© 2024 Caterpillar Inc.
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