26SI Series Alternator – Reports and Messages Not Available

System Operation Description:

There are problems that could be reported with the PL522 or 523 system but the problems are not caused by the PL522 or 523 system. Check for active diagnostic codes for the PL522 or 523. Correct any diagnostic codes before proceeding. Visually inspect the following for damage: module, antenna and cables. Verify that there are no loose connections.

The PL522 or 523 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 cellular network for communications is operational in the geographic area of concern. The network is operational when messages can travel to the cell tower and then to Caterpillar.

  • The PL522 or 523 system is correctly configured to communicate on the network for cellular communications. Correct configuration was verified during manufacturing tests.

  • The PL522 or 523 is configured properly and the software is functioning.

The PL522 or 523 module should not be replaced without verifying that these issues have been investigated. Contact your Caterpillar Technical Communicator for aid in resolving these issues. Subscriptions to the PL522 or 523 module must be up to the current date.

If reports and messages are not available, perform the following steps in order to determine the cause.

Test Step 1. ACCESS THE PL522 AND 523 THROUGH CATERPILLAR ELECTRONIC TECHNICIAN (CAT ET ).

  1. Connect Cat ET to the machine.
  1. Verify that the ECM (VIMS Main Module) is present.

Expected Result:

The ECM (VIMS Main Module) is present.

Results:

  • OK – The ECM (VIMS Main Module) is available. Proceed to Test Step 4.

  • NOT OK – The ECM (VIMS Main Module) is not present in the Cat ET screen.

    Repair: Verify that the wiring for the PL522 or 523 has been installed correctly. Check the wiring with a multimeter. If the ECM (VIMS Main Module) is not present, refer to Systems Operation, Troubleshooting, Testing and Adjusting, “Electronic Service Tool Does Not Communicate with ECM”.

    STOP

Test Step 2. VERIFY THAT THE PL522 or 523 MODULE HAS NOT BEEN DISABLED.

  1. Go to the “GSM (Cellular) Information” screen in Cat ET.
  1. Verify that the “Cellular Network Coverage Status” is “In Coverage”.

Expected Result:

The “Cellular Network Coverage Status” module is “In Coverage”, PL522 or 523 is reporting.

Results:

  • OK – The “Cellular Network Coverage Status” for PL522 or 523 is “In Coverage”. Go to Test Step 4.

  • NOT OK – The “Cellular Network Coverage Status” for PL522 or 523 is “Out of Coverage”. Got to Test Step 4.

  • NOT OK – The “Cellular Network Coverage Status” for PL522 or 523 is “Network Not Allowed”. Proceed to Test Step 3

Test Step 3. VERIFY THAT THE PL522 or 523 MODULE IS RECEIVING CELLULAR SIGNALS.

  1. Go to the “GSM (Cellular) Information” status screen inCat ET.
  1. Verify that the “Cellular Signal Quality” is greater than 25 percent.
  1. Verify that the antenna is correctly installed.
  1. Verify that the unit is in cellular map coverage of the provider.

Expected Result:

The “Cellular Signal Quality” detected is greater than 25 percent.

Results:

  • OK – There is cell coverage in the area and the antenna is correctly installed. Proceed to Test Step 5.

  • NOT OK – Either the unit is out of cell coverage or antenna is installed incorrectly. Verify that the unit is in cellular map coverage of the provider. Proceed to Test Step 8 to check antenna installation.

Test Step 4. VERIFY THAT THE PL522 or 523 MODULE IS CONFIGURED PROPERLY.

  1. Go to the “APN Configuration” screen.
  1. Verify that the “APN Cellular Carrier” is configured to the correct cellular service provider.
  1. Verify that the “APN Username” is configured to the correct cellular network. Refer to cellular provider for correct APN info.
  1. Verify that the “APN Password” is configured with the correct password for cellular network. Refer to cellular provider for correct APN info.
  1. Verify that the “APN SIM PIN” is configured with the correct SIM Card PIN. Refer to SIM Card Provider to determine and program SIM PIN.
  1. Go to the “Configuration” screen.
  1. Verify that the “Machine Serial Number” is configured with the correct machine serial number.
  1. Verify that “Maintenance Mode” is configured as “OFF”.

Expected Result:

All settings are correct.

Results:

  • OK – The PL522 and 523 is configured correctly. Proceed to Test Step 5.

  • NOT OK – The PL522 and 523 is not configured correctly.

    Repair: Correct the configuration of the PL522 and 523. The “APN Configuration” can be verified in the “Cellular Network Coverage Status” within “GSM Information” of Cat ET.

    STOP

Test Step 5. VERIFY WHICH POWER MODE THE PL522 AND 523 IS IN.

  1. Go to “Status Parameters” of Cat ET.
  1. Verify that the “Power Mode Status” is “Power Mode 1” or “Power Mode 2”. Verify that the “Key Switch Status” is “On”.

Expected Result:

The Cat ET screen shows that the machine is in “Power Mode 1” or “Power Mode 2” and “Key Switch On”.

Results:

  • OK – The Cat ET screen is correct. The PL522 or 523 should send a Standard report and a position report daily. Proceed to Test Step 7.

  • NOT OK – Cat ET shows an incorrect power mode. A report of the position is sent in the incorrect power mode. Proceed to Test Step 6.

Test Step 6. VERIFY THAT THE PL522 or 523 MODULE MONITORS THE “MACHINE RUN STATUS” PROPERLY.

  1. Go to “Status Parameters” of Cat ET.
  1. Start the machine.
  1. Verify that the “Power Mode Status” changes to “Power Mode 1”.
  1. Verify that the “Alternator Running Input” changes to “Engine Running”.
  1. Verify that the “Key Switch Status” is “On”.

Expected Result:

The Cat ET Status screen changes to “Power Mode 1” and “Engine Running”. The “Key Switch Status” should be “On”.

Results:

  • OK – The Cat ETscreens are correct. The PL522 or 523 will send a standard report and a position report daily. The power mode can be viewed in VisionLink.STOP

  • NOT OK – ENGINE OFF – The Cat ET screen shows “Engine Off”.

    Repair: Verify that the Alternator R-Terminal wiring has not been damaged. Machine SMH and the SMH of PL522 or 523 no longer matching is likely. Refer to Systems Operation, Troubleshooting, Testing and Adjusting, “Operating Hours Discrepancy”.

    STOP

  • NOT OK – POWER MODE 2 – Cat ET shows “Power Mode 2”.

    Repair: Verify that the wiring for the switched power 308-YL has not been damaged. Repair the wiring.

    STOP

Test Step 7. CHECK FOR “ACTIVE” AND/OR “LOGGED” CODES FOR THE PL522 or 523 ECM.

  1. Follow the steps in the Special Instruction, REHS2365 in order to connect a laptop computer to the PL522 or 523 system.
  1. Go to the menu bar for Cat ET. Select the “Diagnostics” tab. From the drop-down menu, choose the type of code. Choose “Active Codes” or “Logged Codes”.

Results:

  • OK – There are no “active” or “logged” diagnostic codes. Proceed to Test Step 8.

  • Not OK – An “active” or “logged” diagnostic code exists.

    Repair: Refer to the Systems Operation, Troubleshooting, Testing and Adjusting, “Diagnostic Code List” in order to correct possible problems.

    STOP

Test Step 8. CHECK THE INSTALLATION OF THE ANTENNA.

Observe installation of the antenna for the PL522 or 523. Verify that the antenna is installed with a clear view of the sky. The antenna must be in a location that is free from interference. Examples of interference include the following items:

  • Devices on the roof of the machine that could potentially be sources of radio frequency interference

  • Other antennas that are close to the antenna for the PL522 or 523

  • The machine is inside a metal building or another similar structure

  • The machine is under large signs that are lighted

  • The machine is under power lines

Note: Refer to Special Instruction, REHS2365 for additional details on optimal installation of the antenna.

Expected Result:

The antenna is installed on the highest point on the machine. There is a clear view of the sky.

Results:

  • OK – The antenna for the PL522 and 523 is installed properly. Verify that all of the connections for the antenna are tight. Proceed to Test Step 9.

  • NOT OK – The installation of the antenna is not optimal.

    Repair: Accept the current performance of the communication or reinstall the antenna at a superior location.

    STOP

Test Step 9. CHECK THE VOLTAGE FOR THE PL522 or 523 AT THE CONNECTION FOR THE GPS ANTENNA.

With the disconnect closed, check the voltage for the PL522 or 523 at the connection for the GPS antenna on the ECM.

Expected Result:

With neg. lead on the shield and pos. lead on the center pin, the voltage is approximately 3.3 VDC.

Results:

  • OK – The voltage is 3.3 VDC. Proceed to Test Step 10.

  • NOT OK – The voltage is greater than 3.3 VDC or less than 3.3 VDC. The measurement is incorrect.

    Repair: Replace the module. Verify that the system is operating correctly.

    STOP

Test Step 10. CHECK THE COAXIAL CABLE FOR THE CELLULAR ANTENNA.

The cellular antenna can be checked in order to determine if the antenna cable has a broken center conductor. Use an ohmmeter to check resistance between the center conductor of the TNC connector for the cellular antenna to the threaded metal socket at the top of the hard mount antenna or magnetic mount antenna.

Refer to Table 1 for making resistance checks. First column is positive lead and first row is negative lead of the multimeter.

Table 1
Measurements for the PL522 and 523 Antenna (1)    
    Cellular Center Connector     Cellular Outer Connector     GPS Center Connector     GPS Outer Connector     Metal Base of Antenna    
Cellular Center Connector     0 + 3 Ohm     9K +/- 5% Ohm     495K +/- 15K Ohm     9K +/- 5% Ohm     9K +/- 5% Ohm    
Cellular Outer Connector     9K +/- 5% Ohm     0 + 3 Ohm     486K +/- 15K Ohm     0 + 3 Ohm     0 + 3 Ohm    
GPS Center Connector     584K +/- 15K Ohm     575K +/- 15K Ohm     0 + 3 Ohm     574K +/- 15K Ohm     574K +/- 15K Ohm    
GPS Outer Connector     9K +/- 5% Ohm     0 + 3 Ohm     486K +/- 15K Ohm     0 + 3 Ohm     0 + 3 Ohm    
( 1 ) Valid only for Fluke 87 Series Multimeters

Note: All measurements taken with a Fluke 87 V. Different multimeters might provide varying results.

Results:

    Continue to the next test step.

Test Step 11. VERIFY THAT THE CENTER CONDUCTOR OF THE ANTENNA HAS NOT SHORTED TO THE SHIELD.

  1. Disconnect the GPS and the cellular antenna cable from the radio.
  1. Measure the resistance from the shield of the antenna cable (GPS) and the cellular antenna cable to the conductor at the center of each of the cable connectors. The shield is the threaded part of the connector.

Refer to Table 1 for a complete listing of resistance checks for the antenna and resistance values.

Expected Result:

The resistance for the GPS antenna meets the defined specifications in Table 1.

The resistance for the cellular antenna meets the defined specifications in Table 1.

Results:

  • OK – The resistance for the GPS antenna meets the specifications that are defined in the tables that are listed above. The resistance for the cellular antenna meets the specifications that are defined in the tables that are listed above. The resistance is correct.STOP

  • NOT OK – The resistance for the GPS antenna does not meet the specifications that are defined in the tables that are listed above. The resistance for the cellular antenna does not meet the specifications that are defined in the tables that are listed above. The resistance is incorrect.

    Repair: The antenna cable or the antenna has a short from the center conductor to the outer shield. Replace the antenna assembly. Verify that the radio is operating correctly.

    STOP

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