931C caterpillar track loader service manual pdf download

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1. 931C TRACK LOADER
Printed by Heavy Equipment Manuals



Printed in U.S.A
v2.20
Heavy Equipment Manuals

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Product: TRACK LOADE R
Mo del: 93 1C TRACK LOADER 6RF
Co nfig uration: 93 1C & 93 1C LGP T RASH LOADE RS 6RF00 001-UP (MACH INE) POWE RE D BY 3 204 E NGINE
Troubleshooting
Product Link 121S/300
Media Number -RENR7911-13 Publ ication Date -01/10/2014 Date Updated - 19/09/2016
i0 56 618 22
Diagnostic Capabilities
SMCS - 7610-DTN
Connecting a Computer to the Product Link System
Required Software
This system requires Caterpillar Electronic Technician (Cat ET) version 2004B or later.
Note: Cat ET (version 2007A) is recommended. Always update Cat ET to the latest version in order to
access all of the available functionality of Product Link.
Supported Hardware Connections
The PL121SR Radio and PL300 ECM are configured with Cat ET that use the following communications
interfaces:
•For PL121SR installations only, the 245-7310 Serial Service Cable is connected between the PC
serial port and the serial service connector on the radio legacy harness or the conversion harness. The
CatET"Communications Interface Device" is configured for the "Embedded Communications
Adapter".
•For PL121SR plus the PL300 installations only, the 171-4400 Caterpillar Communications Adapter
II hardware is connected between the machine service connector and the PC serial port or parallel
port. The Cat ET "Communications Interface Device" is configured for the "Caterpillar
Communications Adapter II (RP1210)".
Note: The configuration parameters for the "Communications Interface Device" are found in Cat ET under
"Utilities" menu, "Preferences" drop-down menu.
Configure Computer Interface Communications for Cat ET
The following screen examples show how to configure computer communications in order to use Cat ET.
1.Use the 245-7310 Serial Service cable to connect a computer with the required Cat ET software to
the serial service connector of the wiring harness.
2.Select "Utilities" on the menu bar.

6. Illustration 1 g01362853
"Preference" Screen of Cat ET
3.From the drop-down list, select "Preference".
Illustration 2 g01361220
"C aterpillar Embe dded Com munications Adapter " Screen
4.Select the "Communications" tab (if the tab has not already been automatically selected). Click on
the arrow for the drop-down menu in order to expand the menu. Select "Caterpillar Embedded
Communication Adaptor".

7. Diagnostic Capabilities for PL121SR Radio
PL121SR Radio
Illustration 3 g01114501
263-9088 Com munication Radio Gp (PL121SR Radio)
(1) Yellow LED - VHF Com munication Fix Status
(2) Orange LED - GPS Fix Sta tus
(3) Green LED - Engine Running
The green LED is ON when the engine is running. If the green LED is OFF, the engine is OFF.
The orange LED flashes while the GPS receiver searches for GPS satellites. When the system obtains a
valid fix, the LED does not flash but the LED remains illuminated.
The yellow LED flashes while the PL121S radio antenna searches for VHF provider satellite connections.
When the antenna obtains a fix on the VHF provider satellites, the LED does not flash but the LED
remains illuminated.
Diagnostics That Use Caterpillar Electronic Technician (Cat ET)

8. Illustration 4 g01100021
The Com munic ations Adapter shown is only for use in a PL321 system. The PL121 requires the 245-7310 Control Harness
Assembly (Ser vice cable ).
The Caterpillar Electronic Technician (Cat ET) is a software program that is used to access data. The
service technician can use Cat ET in order to perform maintenance on the machine. Some of the options
that are available with Cat ET are listed below:
•Viewing of the diagnostic codes (Refer to the Systems Operation, Troubleshooting, Testing and
Adjusting, "Diagnostics Code List" in order to view a list of the codes.)
•Viewing active event codes and logged event codes
•Viewing the status of parameters
•Viewing clear active diagnostic codes and clear logged diagnostic codes
•Performing calibration of machine systems
•Programming the ECM (Flash) with the "Winflash" program Refer to the Systems Operation,
Troubleshooting, Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program".
•Printing reports.
The following list contains some of the diagnostic functions and programming functions that are performed
by the service tools.
•The failures of the ECM system are displayed.
•The status of most of the inputs and the outputs are displayed.
•The settings for the ECM are displayed.
•Display the status of the input and output parameters in real time.
•Display the clock hour of the internal diagnostic clock.

9. •The number of occurrences and the clock hour of the first occurrence and the last occurrence is
displayed for each logged diagnostic code.
•The definition for each logged diagnostic code and each event is displayed.
•Load new FLASH software.
Refer to the Systems Operation, Troubleshooting, Testing and Adjusting, "Diagnostic Code List" for the
list of diagnostic codes for the PL300 ECM.
Status Groups for Caterpillar Electronic Technician
In order to access the status groups, follow the procedure that is listed below.
1.Select the "Information" tab on the menu bar.
2.Click "Status" (1) or click the "Status" icon (2) on the tool bar. Refer to Illustration 5.
The status groups should be used in order to verify that the installation of the Product Link module has
been successful.
Illustration 5 g01126711
(1) Status on M enu Bar
(2) Status Icon on Tool Bar
There are as many as six status groups which have screens available in Cat ET for verifying and servicing
the Product Link system .
Note: Some of the status group screens are for use only with the PL121SR system where other screens are
for use with the PL321 system.
"Queued Messages" From "Message Queue"

10. Illustration 6 g01362236
"Queued Sta tus" Scr een for PL121SR
Illustration 7 g01362237
"Queue Status" Screen for PL321SR
The PL121SR system "Message Queue" screen for Product Link in Illustration 6 shows a current count of
the messages that are pending to be sent by the Product Link module. For the PL321 system "Message
Queue" screen, refer to Illustration 7. Table 1 explains the possible values for the queued messages and the
types of queued messages.
Table 1

11. "Queue Status Screen" Information
Queue Information System Description
Queued Status
Messages
PL121SR and
PL321SR
This value is the current count of status messages that are
pending to be sent by the Product Link module. This number
can be up to 3.
Queued Event
Messages
PL321SR
This value is the current count of event messages that are
pending to be sent by the Product Link module. This number
can be up to 5.
Queued Diagnostic
Messages
PL321SR
This value is the current count of diagnostic messages that are
pending to be sent by the Product Link module. This number
can be up to 5.
Queued Registration
Messages
PL121SR and
PL321SR
This value is the current count of registration messages that
are pending to be sent by the Product Link module. This
number is either 0 or 1.
Queued Administration
Messages
PL121SR and
PL321SR
This value is the current count of administration messages
that are pending to be sent by the Product Link module. This
number is either 0 or 1.
Queued De-
Registration Messages
PL121SR and
PL321SR
This value is the current count of de-registration messages
that are pending to be sent by the Product Link module. This
number is either 0 or 1.
Queued Service Meter
Change Messages
PL121SR and
PL321SR
This value is the current count of hour change messages for
the service meter that are pending to be sent by the Product
Link module. This number can be up to 5.
Queued Position
Report
PL121SR and
PL321SR
This value is the current count of position report messages
that are pending to be sent by the Product Link module. This
number is either 0 or 1.
Queued SMU Report
PL121SR and
PL321SR
This value is the current count of report messages for the
service meter unit that are pending to be sent by the Product
Link module. This number is either 0 or 1.
Queued Fuel Report PL321SR
This value is the current count of fuel reports that are pending
to be sent by the Product Link module. This number is either
0 or 1.
Queued Time and Geo-
Fencing Report
PL121SR and
PL321SR
This value is the current count of "Time and Geo-Fencing
Report" messages that are pending to be sent by the Product
Link module. This number can be up to 3.
Queued ECM List
Report
PL321SR
This value is the current count of ECM list reports that are
"pending to be sent" by the Product Link module. This
number can be up to 5.
Test messages can be added to the queues by selecting "PLM Commands" from the "Service" drop-down
menu. Then, the user must select the desired message. All pending messages can be cleared by selecting
"Clear Message Queue" from this menu.
Note: Do not clear out event messages (legitimate) or diagnostic messages that need sent. Messages will
not be created again unless an event or a diagnostic occurs again.

12. Illustration 8 g01450724
View of "Messa ge Buffer " Screen
If the message buffer is full, Cat ET will display a message of "Unable to send the PLM Command. The
command was denied because the message buffer is full.". Refer to Illustration 8.
"Message Buffer Full" - If Cat ET is showing a message that is still in the queue, the user must wait up to
15 minutes before queueing an additional message of the same type. If the user attempts to queue an
additional message of the same type prior to the 15 minute period, the "Message Buffer Full" message will
display.
"Message Timer Not Expired" - If Cat ET is not showing a message in the queue, the user must wait up
to 15 minutes before queueing an additional message of the same type. If the user attempt to queue an
additional message of the same type prior to the 15 minute period, the "Message Timer Not Expired"
message may display.
"PLM Operational Status" Screen
The Product Link "Status parameters" screens in Illustration 9 and Illustration 10 show the current
operational status of the Product Link module.
Illustration 9 g01331522

13. Device C onfiguration and Status Screen for PL121SR
Illustration 10 g01363208
Device C onfiguration and Status Screen PL321SR
Refer to Table 2 for an explanation of the PLM parameters.
Table 2
Device Configuration and Status Information for Product Link
Product Link
Information
System Description
PLM Registration
Status
PL121SR
and
PL321SR
Registered: The PLM is properly registered on the
communications system. The PLM must be registered for
messages to be transmitted.
De-registered: The PLM is not registered on the
communications system and will not transmit any messages
except a registration command.
Confirmation Pending: The PLM is awaiting confirmation that
the registration was successfully processed in the back office.
Failed: The PLM registration was not processed successfully.
Verify that the parameters are correct.
Primary
Communication Link
PL121SR
and
PL321SR
On Line: A communications satellite is in view allowing the
PLM to send and receive messages.
Off Line: There are no communications satellites in view so no
messages can be transmitted.
Power Mode Status PL121SR
and
PL321SR
Power Mode 1: The machine has operated in the last 48 hours.
If the key is OFF, The PL121 will check for messages and wake
up the PL300 as needed (if installed).
Power Mode 2: The machine has not operated for at least 48
hours, but the machine has operated in the last 7 days. The
PLM will wake up periodically (every 6 hours by default) to
send and receive messages.

14. Power Mode 3: The machine has not operated In the last seven
days. The PLM will wake up every 24 hours to send and
receive messages. All modules with the latest software are in
Power Mode 3 until initial registration.
PL121 and PL321"operation" refers to Engine running.
Alternator Running
Input
PL121SR
and
PL321SR
Engine Running: The Alternator R-Terminal reflects that the
engine is currently running.
Engine Off: The Alternator R-Terminal reflects that the engine
is not currently running.
GPS Receiver
PL121SR
and
PL321SR
Functional: The hardware for the GPS receiver is functional.
Not Functional: The hardware for the GPS receiver is not
functional.
Status of the
Keyswitch
PL121SR
and
PL321SR
On: The machine keyswitch is in the ON state. The PLM will
be powered up.
Off: The machine keyswitch is in the OFF state. The PLM will
periodically power up in order to send messages and receive
messages depending on the Power Mode.
Possible Periods of
Communication
Blockage
PL121SR
and
PL321SR
Yes: The PLM has not seen a communications satellite for an
extended period of time causing scheduled reports to be missed.
This value is reset automatically after the status is reported to
the office.
No: The PLM has not experienced a loss of communications
and has been communicating as scheduled.
Possible Device
Power Disconnection
PL121SR
and
PL321SR
Yes: The PLM has missed reports due to a power loss. This
value is reset automatically after the status is reported to the
office.
No: The PLM has not missed any scheduled reports due to
power loss.
Status of the Security
System
PL321SR
Available: MSS is detected
Unavailable: MSS is not detected
"Digital Input" Status (PL321 only)

15. Illustration 11 g01363225
"Digital Inputs" Screen
The digital sensor information is shown in "Digital Inputs". Refer to Illustration 11. Refer to Table 3 for an
explanation of related parameters for the digital sensor.
Table 3
Configuration and Status Information for the Digital Sensor
Digital Sensor System Description
Digital Sensor Input #1 PL321SR
Active: The switch is operating outside of normal conditions.
Not Active: The switch is operating within normal conditions.
Not Configured: The switch has not been configured or installed.
Digital Sensor Input #2 PL321SR
Active: The switch is operating outside of normal conditions.
Not Active: The switch is operating within normal conditions.
Not Configured: The switch has not been configured or installed.
Digital Sensor Input #3 PL321SR
Active: The switch is operating outside of normal conditions.
Not Active: The switch is operating within normal conditions.
Not Configured: The switch has not been configured or installed.
Digital Sensor Input #4 PL321SR
Active: The switch is operating outside of normal conditions.
Not Active: The switch is operating within normal conditions.
Not Configured: The switch has not been configured or installed.
"Time and Geo-Fencing" Status

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17. Illustration 12 g01364433
"Time and Geo- Fencing" Scre en
The Product Link "Time and Geo-Fencing" screen that is shown in Illustration 12 shows the current status
of the "Fence" parameters. "Fencing" allows tracking of the movement of a machine. There are three types
of "Fences" that are available:
"Geographic Exclusion" - When active, the option "Geographic Exclusion" of "Fencing" will generate a
report if a machine moves into an unknown area.
"Geographic Inclusion" - When active, the "Geographic Inclusion" option of "Fencing" will generate a
report if a machine moves out of a specified area.
"Time Based" - If a machine is operated outside of a specified time period, the "Fencing" option will
generate a report.
Refer to Table 4 for an explanation of the Fence parameters.
Table 4
Fence Status Group Parameters
Status Values Description
Time Based Activation
Status
Active
Time Based Product Watch has been properly configured and
is currently activated.
Not
Active
There is currently no Time Based Product Watch properly
configured and/or it is not currently activated.
Geographical Exclusion
Activation Status
Active
Geographical Exclusion Product Watch has been properly
configured and is currently activated.
Not
Active
There is currently no Geographical Exclusion Product Watch
properly configured and/or it is not currently activated.
Geographical Inclusion
Activation Status
Active
Geographical Inclusion Product Watch has been properly
configured and is currently activated.

18. Not
Active
There is currently no Geographical Inclusion Product Watch
properly configured and/or it is not currently activated.
Time Based Alarm
On There is an active Time Based Alarm.
Off There is not an active Time Based Alarm.
Geographical Exclusion
Boundary Alarm
On There is an active Geographical Exclusion Boundary Alarm.
Off
There is not an active Geographical Exclusion Boundary
Alarm.
Geographical Inclusion
Boundary Alarm
On There is an active Geographical Inclusion Boundary Alarm.
Off
There is not an active Geographical Inclusion Boundary
Alarm.
"GPS Information" Status
Illustration 13 g01363341
"GP S Inform ation" Screen
The Product Link PL121SR "GPS Information" screen shown in Illustration 13 shows the current status of
the Product Link GPS. Refer to Table 5 for an explanation of the GPS-related parameters.
Table 5
GPS Information Parameters
Status Description
PC Current
Date/Time
The current Date and Time of the host PC is displayed.
GPS Position
Status
Valid: The Product Link Module has previously calculated a valid fix.
Invalid: The Product Link Module has not calculated a previous fix.

19. GPS Time Stamp The time stamp from the last fix is displayed. The time can be compared to the
Current Date/Time to verify that the time since the last position was calculated.
GPS Latitude The last valid GPS Latitude is displayed.
GPS Longitude The last valid GPS Longitude is displayed.
Number of GPS
Satellites
The number of GPS satellites currently in use by the GPS receiver.
(1)
(1)
Three or more satellites are needed to get an updated position fix.
"Satellite Information" Status
Illustration 14 g01450732
Satellite Information Screen
Note: Disregard the value of the "Average Wireless Communication Error Count" when satellite
communication status value equals "Not Established". To have a "Average Wireless Communication Error
Count" is normal, if communication with the satellite is not established.
The "Satellite Information" screen for the Product Link PL121SR that is shown in Illustration 14 shows the
current satellite communications status. Refer to Table 6 for an explanation of satellite communications
status parameters.
Table 6
Satellite Communications Status Information
Communications
Status Information
System Description Notes
Satellite
Communication
Status
PL121SR
and
PL321SR
Established: The PLM has an active
connection to a satellite.

20. Not Established: The PLM does not
have an active connection to a
satellite.
This is not an error mode.
Satellites move quickly.
Often times a satellite has
moved out of view of the
antenna and another has not
yet moved into view of the
antenna.
Satellite Network
Control Center
Communication
Status
PL121SR
and
PL321SR
Established: The satellite that the
PLM is communicating with has a
connection to a Network Control
Center (ground station).
Not Established: The satellite that
the PLM is communicating with
does not have a connection to a
Network Control Center (ground
station).
This is not an error mode.
Satellites move quickly.
Often times a satellite has
moved out of view of the
antenna and another has not
yet moved into view of the
antenna.
Average Wireless
Communication
Error Count
PL121SR
and
PL321SR
This value is an indication of the
quality of the connection with the
satellite used for troubleshooting
satellite connections. The lower the
number, with a minimum of 0, the
better the signal strength. As the
value increases, the amount of
transmit time for signals increases.
Communications
Satellite
Identification
Number
PL121SR
and
PL321SR
This value identifies the particular
communications satellite that the
PLM is tracking.
If no satellite is in range, the
indication will be
"Conditions not met".
Communications
Modem Signal to
Noise Ratio
PL121SR
and
PL321SR
This value indicates quality of the
communications signal expressed as
a number. The higher the number,
the better the signal.
A value below 10 will
typically cause no
transmissions. The higher
the value above 10, the
better the chances of
successful message
transmission.
Communications
Modem Signal
Quality
PL121SR
and
PL321SR
This value indicates the overall
quality of the communications signal
based on several factors expressed as
a percentage.
0% = poor quality
100% = Best quality
Communications
Modem Status
PL121SR
and
PL321SR
This value indicates the provisioning
status of the communications
modem.
Normal status is enabled. If
status is "Disabled" or
"Pending", contact your
Caterpillar Technical
Communicator.
Communications
Modem Activation
Delay Time
PL121SR
and
PL321SR
This value indicates the time that the
communications modem has
remaining in a "pending" status.
Displayed in h/m/s format.
Message
Transmission Status
Indications are: No Message
in Queue

21. PL121SR
and
PL321SR
This status indicates where the
queued message lies in its
transmission cycle.
Ready to send
Clear to send
Sending
Sent
Requeuing
Message
Transmission
Timestamp
PL121SR
and
PL321SR
This is an indication to show the
exact date and time that the last
message was successfully
transmitted to the communications
satellite.
Displayed in number format
date/time with an AM/PM
suffix.
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Fri Aug 2 1 11 :22: 19 UTC+05 30 20 20

22. 

Product: TRACK LOADER
Model: 931C TRACK LOADER 6RF
Configuration: 931C & 931C LGP TRASH LOADERS 6RF00001-UP (MACHINE) POWERED BY 3204 ENGINE
Troubleshooting
Product Link 121S/300
Media Number -RENR7911-13 Publication Date -01/10/2014 Date Updated -19/09/2016
i05662649
Diagnostic Code List
SMCS - 7569
Table 1
Module Identifier 122 Diagnostic Codes
(1)
CID 0168 Electrical System
FMI 03 for PLVIMS and PL GSM Voltage above normal
FMI 04 for PLVIMS and PL GSM Voltage below normal
CID 0254 Electronic Control Module
FMI 04 Voltage below normal
FMI 12 Failed Module
CID 0269 Sensor Power Supply
FMI 03 Voltage above normal
FMI 04 Voltage below normal
CID 1250 Remote Communication Module
FMI 09 Unable to establish communication
CID 1251 Alternator R-Terminal
FMI 03 Voltage above normal
(1)
For troubleshooting, see the procedure with the same CID FMI.
Note: A machine ECM will self-erase a diagnostic if the diagnostic does not reappear after 100
operating hours. When this event happens, the event history screen in the EquipmentManager
application will show a code that occurred 100 hours in the past that no longer shows up in Cat ET
because the diagnostic has not reoccurred.

23. Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Fri Aug 21 11:25:38 UTC+0530 2020

24. 

Product: TRACK LOADER
Model: 931C TRACK LOADER 6RF
Configuration: 931C & 931C LGP TRASH LOADERS 6RF00001-UP (MACHINE) POWERED BY 3204 ENGINE
Troubleshooting
Product Link 121S/300
Media Number -RENR7911-13 Publication Date -01/10/2014 Date Updated -19/09/2016
i05662620
Diagnostics and Events Not Available
SMCS - 0785-038-UE; 7610-038
System Operation Description:
There are problems that could be reported with the Product Link system but the problems are not
caused by the Product Link system. The problem can be described as the diagnostic information or
events are not received at the office. This section contains steps that are used to determine the
possible cause. Check for active diagnostic codes for the Product Link. Correct any diagnostic
codes before proceeding. The following items should be visually inspected for damage: PL121SR
radio, PL300 module, antenna and cables. Verify that there are no loose connections.
The Product Link system depends on several communication links in order to transfer data from
the machine to the office. The following procedures assume that these communication links are
operating properly. The proper communication links are listed below:
•The satellite network for VHF communications is operational in the geographic area of
concern. The network is operational when messages can travel to the satellite and the
messages can travel to the earth and Caterpillar.
•The Product Link system is correctly configured to communicate on the network for VHF
communications.
•The worldwide network of Caterpillar's computers is passing messages to software of the
Caterpillar Equipmentmanager (EM).
•The Caterpillar Electronic Technician (Cat ET) is configured properly and the software is
functioning.
The PL121SR radio or the PL300 module should not be replaced without verifying that these
issues have been investigated. Contact your Caterpillar Technical Communicator for aid in
resolving these issues.
The Product Link can be configured in order to transmit diagnostics and events to the office.
These transmissions are highly dependent on the configuration of the Product Link. The following
troubleshooting steps assume that the position and the Standard Report are being received.

25. Test Step 1. ACCESS THE PRODUCT LINK THROUGH THE CAT ET SERVICE TOOL.
A.Connect the Cat ET service tool to the machine.
B.Verify that the ECM (Product Link) is available.
Expected Result:
The ECM (Product Link) is available.
Results:
•OK - The ECM (Product Link) is available. Proceed to Test Step 2.
•NOT OK - The ECM (Product Link) is not present in the Cat ET screen.
Repair: Verify that the wiring for the Product Link has been installed correctly. Check the
wiring with a multimeter. If the ECM ( Product Link) is not available, see Systems
Operation, Troubleshooting, Testing and Adjusting, "Electronic Service Tool Does Not
Communicate with ECM".
STOP
Test Step 2. VERIFY THAT THE PRODUCT LINK MODULE IS CONFIGURED
PROPERLY.
A.Go to the "Configuration" screen. See Systems Operation, Troubleshooting, Testing and
Adjusting, "Installation Parameters Configure" for more information.
B.Verify that the "Warning Level 3 Report Configuration" is set to either "Immediate" or
"Next Scheduled".
C.Verify that the "Warning Level 2 Report Configuration" is set to either "Immediate" or
"Next Scheduled".
D.Verify that the "Warning Level 1 Report Configuration" is set to either "Immediate" or
"Next Scheduled".
E.Verify that the "Diagnostic Report Configuration" is set to either "Immediate" or "Next
Scheduled".
Expected Result:
All settings are correct.
Results:
•OK - The Product Link is configured correctly. Proceed to Test Step 3.
•NOT OK - The Product Link is not configured correctly.
Repair: Configure the Product Link again. Refer to Systems Operation, Troubleshooting,
Testing and Adjusting, "Installation Parameters Configure".
STOP

26. Test Step 3. CHECK FOR LOGGED EVENTS OR DIAGNOSTICS THAT MAY HAVE
OCCURRED.
Use the Cat ET service tool in order to verify the existence of logged events or diagnostics on
other ECM systems to report to the office. Note any events and diagnostics that are not reported.
Expected Result:
There are no logged events or diagnostics that should have been reported.
Results:
•OK - There are no logged events or diagnostics that should have been reported. The Product
Link appears to be working correctly.
STOP
•NOT OK - There are logged events or diagnostics that should have been reported. Monitor
the operation of the Product Link for reporting of events and diagnostics. Problems in this
area are not usually a problem with the module. Ensure that the "Event/Diagnostic Report
Interval (SMU)" and the "Event/Diagnostic Message Interval (RT)" are configured properly.
Ensure that the module is reporting as expected based on those settings. The module should
not be replaced.
STOP
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Fri Aug 21 11:24:24 UTC+0530 2020

27. 

Product: TRACK LOADER
Model: 931C TRACK LOADER 6RF
Configuration: 931C & 931C LGP TRASH LOADERS 6RF00001-UP (MACHINE) POWERED BY 3204 ENGINE
Troubleshooting
Product Link 121S/300
Media Number -RENR7911-13 Publication Date -01/10/2014 Date Updated -19/09/2016
i06045349
ECM Does Not Communicate with User Interface
SMCS - 7606-038-EK2
Test Step 1. Off-Site Diagnostics.
Note: Some steps of the "Off-Site Diagnostics" sections are dependent on the customer being on
site.
A.Determine the Subscription Status
Check the status of the customers Product Link subscription within the "Trimble VisionLink
Store".
a.If the subscription status is not current, refer to Step 2. Product Link Subscription
Status is Not Current.
b.If the subscription status is current, refer to Step 3. Product Link Subscription Status
is Current.
B.Product Link Subscription Status is Not Current
Check to see if the subscription is set up correctly, or is out of date. Contact your dealer
administrator for subscription services.
C.Product Link Subscription Status is Current
a.Log on to the equipment page through Vision Link.

28. Illustration 1 g03773257
Refresh button shown with arrow.
b.On the equipment page click on the refresh button.
- If the equipment checks in with new data, then the equipment was more than likely
out of coverage. The equipment should continue to check in from this point as long as
coverage remains available.
- If the equipment does not respond to the "Refresh", continue to Step c.
Do not operate or work on this equipment unless you have read and
understand the instructions and warnings in the Operation and
Maintenance Manuals. Failure to follow the instructions or heed the
warnings could result in injury or death. Contact your Caterpillar
dealer for replacement manuals. Proper care is your responsibility.
c.Request the location of the equipment. With the customer at the location of the
equipment, the following questions may or may not be answered. Ask the customer if
the equipment is powered ON, and located where the radios have clear line of sight to
the sky.
- If the equipment was inside of a building, under/next to a large obstacle, or has the
battery power OFF, have the customer do the following:
Turn the equipment power ON if the power was OFF.
Attempt to move the equipment to a more open location with a clear line of
sight to the sky.

29. Try the "Refresh" again.
- If the equipment was ON and in a good location for data transfer, have the customer
check to see if the equipment has a radio disable switch installed. If the equipment has
a radio disable switch, have the customer check to see if the radio disable switch was
disabled.
Results:
•Off-Site diagnostics were performed prior to sending a tech on site to troubleshoot the
Product Link Not Communicating problem and the Vision Link "Refresh Button"
does not return new data, continue to "Test Step 2. CHECK THE INSTALLATION
OF THE ANTENNA" -
STOP
Test Step 2. CHECK THE INSTALLATION OF THE ANTENNA.
Observe installation of the antenna for the Product Link. Verify that the antenna is installed with a
clear view of the sky. The Product Link antenna and coaxial cable must be in a location that is not
close to radio frequency interference (RFI). Examples of interference may include but are not
limited to include the following items:
•Product Link radio antenna located too close to sources of radio frequency interference
(RFI) such as:
- Rotating Beacon lights, Halogen Strobe lights, and AC Fans. Refer to Special Instruction,
REHS2365, "Installation Guide for Product Link PL121SR and PL321", "Interference from
Warning Beacons". Also Refer to Service Magazine, SEPD1639, "Product Link Signal
Communication Improvements Are Now Available on Certain Large Wheel Loaders, Landfill
Wheeled Dozers, and Landfill Compactors" which addresses adequate shielding to prevent radio
interference with Product Link antenna.
- LED lights are recommended. Refer to Service Magazine, SEPD1908, "Revision to "Reports and
Messages Not Available" Troubleshooting Procedure for Cat® Products with Cat® Product Link
121/321" for the recommended LED lights.
- Other communication antennas on the roof of the machine.
Refer to Special Instruction, REHS2365, "Installation Guide for Product Link PL121SR and
PL321" for additional details on optimal installation of the antenna.
- Tie-wrap tightness on coax hold-downs should be snug enough to limit rubbing but not over-
tightened to prevent crushing or pinching of the coax shielding.
- Coax should be located a minimum of 9 mm (0.35 inch) from any Control module.
- Last coax tie-wraps should secure within 175 mm (6.89 inch) of the coax connector.
Expected Result:
The antenna is installed properly according to the guidelines and specifications listed in this
procedure and Referenced publications.
Results:

30. •OK - The antenna for the Product Link is installed properly. Verify that all of the
connections for the antenna are tight. Proceed to Test Step 3.
•NOT OK - The installation of the antenna is not optimal.
Repair: Reinstall the antenna at a superior location.
STOP
Test Step 3. ACCESS THE PRODUCT LINK THROUGH CATERPILLAR ELECTRONIC
TECHNICIAN (CAT ET).
A.Connect Cat ET to the machine.
B.Verify that the ECM (Product Link) is available.
Expected Result:
The ECM (Product Link) is available.
Results:
•OK - The ECM (Product Link) is available. Proceed to "Test Step 5. VERIFY PRODUCT
LINK SETTINGS AND CONFIGURATIONS ARE CORRECT.".
•NOT OK - The ECM (Product Link) is not present in the Cat ET screen.
Proceed to Test Step 4. VERIFY THE PRODUCT LINK WIRING.
Test Step 4. VERIFY THE PRODUCT LINK WIRING.
Note: Ensure the Master Disconnect is closed and the Key Switch is ON.
•Check for a blown fuse and replace if necessary.
•Check to see if there is an optional "Radio Disable Switch" installed. If there is a "Radio
Disable Switch" installed, make sure that the switch is in the ON position. Refer to Special
Instruction, REHS2365, "Installation Guide for Product Link PL121SR and PL321 -
Optional Installation of Product Link Blast Zone Switch" for more information
•Verify that the green LED on the radio is ON. The green LED signifies that the radio is
receiving system voltage and key switch power.
•If the LED is not visible, use a voltmeter to verify that the radio has system voltage on pin 1
(battery +) and switched power on pin 3 (key switch).
•For PL321 systems, verify that the PL300 has system voltage on pin 52 or 53 (battery +)
and switched power on pin 70 (key switch).
•Verify the data link wiring from the Product Link to Cat ET, including any Communication
Adapter being used.
Expected Result:

31. For PL121 systems, if all wiring is OK and the radio is receiving the proper power, replace the
radio and verify that the replacement resolved the issue. Refer to section "Select a Location for
Mounting the PL121SR Radio" to make sure that the radio is mounted optimally.
For PL321 systems, if all wiring is OK and the Product Link is receiving the proper power,
replace the PL300 and verify that the replacement resolved the issue. Refer to section "Select a
Location for the PL300 ECM" to make sure that the PL300 is mounted optimally.
Results:
•OK - All wiring is correct. PL121 and PL321 systems are properly working.
•NOT OK - If any wiring discrepancies were found, repair or correct the issue and verify
that the issue was resolved.
STOP
Test Step 5. VERIFY PRODUCT LINK SETTINGS AND CONFIGURATIONS ARE
CORRECT.
Reference: Special Instruction, REHS2365, "Installation Guide for Product Link PL121SR and
PL321", "Configure and Register Product Link PL121SR Radio and PL300 ECM"
Reference: Special Instruction, REHS2365, "Installation Guide for Product Link PL121SR and
PL321", "Review Product Link Device Configuration and Status"
A.Verify that the Product Link module has been registered.
Verify that the "PLM Registration Status" is "Registered". Refer to Systems Operation,
Troubleshooting, Testing and Adjusting, RENR7911, "Product Link 121S/300", "Diagnostic
Capabilities" for an explanation of the "PLM Registration Status".
Refer to Special Instruction, REHS2365, "Installation Guide for Product Link PL121SR and
PL321", "Configure and Register Product Link PL121SR Radio and PL300 ECM".
B.Verify that the Product Link module is properly configured.
Verify that the following configurations are correct:
Dealer Code
"DBS Machine Make Code"
"Machine Serial Number"
"Maintenance Mode" is "Off"
"Global Gram Mode" setting is correct
Note: "Global Gram Mode" default setting is "disabled" and should not be changed for the
majority of machines. Users should contact the DSN before enabling Global Gram Mode.
Results:

32. •OK - Product Link settings listed above are correctly configured. Proceed to Test Step 6:
VERIFY SATELLITE COMMUNICATIONS LINK
Test Step 6. VERIFY SATELLITE COMMUNICATIONS LINK.
In Cat ET, navigate to the Message Queue status screen and observe the number of queued
messages. Take note of how many messages are pending in each message queue.
Each message queue has a maximum allowable number of messages that can be queued at the
same time. In the most current production Product Link software, the maximum message count
limits are:
•Status Messages: 10
•Event Messages: 5
•Diagnostic Messages: 5
•All other message types: 1
If any queue contains a number higher than the maximum listed above, replace the PL121 radio
and retest.
In Cat ET, navigate to the Satellite Information status screen and monitor the various satellite
parameters for a minimum of 15 minutes. Note the values shown in the following parameters:
•Average Wireless Communication Error Count
•Communication Satellite Identification Number
•Communications Modem Signal to Noise Ratio
•Communications Modem Signal Quality
Average Wireless Communications Error Count - An indication of the number of errors
occurring in the communication traffic between the PL121 and the satellite. This number must be
at or near zero in order for the Product Link to successfully transmit.
Communication Satellite Identification Number - The actual identification number of the
satellite that the Product Link is attempting to communicate with.
Communications Modem Signal to Noise Ratio - A measure of the amount of noise in the
communication signal between the PL121 and the satellite. The higher the number, the better the
chances are of the PL121 successfully transmitting a message. On average, a signal-to-noise level
of 7.5 or higher is required to successfully transmit a message, although communications
sometimes succeed with lower numbers.
Communications Modem Signal Quality - A general indication of the quality of the
communication link between the PL121 and the satellite. On average, a signal quality of 50% or
higher is required to successfully transmit a message.
For PL121 Systems:
A. PL121 system with no messages in the queues.

33. This is the sample of the sample click on
the download link for complete manual
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34. This is the sample of the sample click on
the download link for complete manual
DOWNLOAD LINK
For some reason if link does not work
download this pdf and then click