26SI Series Alternator – Position Reports Not Available

System Operation Description:

This section contains steps that can be used to help determine the possible cause of erratic reports of interval. 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. This was verified during manufacturing tests.

  • The worldwide network of Caterpillar’s computers is passing messages to the software for the Caterpillar Equipmentmanager (EM).

  • EM is configured properly and the software is functioning.

The Product Link module nor the radio should not be replaced without verifying that these issues have been investigated. Contact the Caterpillar Technical Communicator for aid in resolving these issues.

Refer to the Product Link device configuration and status information in Systems Operation, Troubleshooting, Testing and Adjusting, RENR7911, “Diagnostic Capabilities” in order to ensure that the lack of reporting is not due to the power mode. The unit is likely to have been configured correctly if the following statements exist:

  • There is no position report after moving the machine (“Position Report Minimum Location Change”).

  • The SMH report is received.

There is likely to be a problem with the systems GPS. Proceed with the following steps in order to determine the cause:

Test Step 1. ACCESS THE PRODUCT LINK THROUGH CATERPILLAR ELECTRONIC TECHNICIAN (CAT ET).

  1. Connect the Cat ET service tool to the machine.
  1. 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 3.

  • 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, refer to Systems Operation, Troubleshooting, Testing and Adjusting, “Electronic Service Tool Does Not Communicate with ECM”.

    STOP

Test Step 2. VERIFY IF THE MACHINE HAS MOVED

Verify if the machine has moved more than the configured minimum distance (“Position Report Minimum Location Change”) since the last known Position Report.

Expected Result:

The machine has not moved.

Results:

  • OK – The machine has moved less than the configured minimum distance (“Position Report Minimum Location Change”) since the last known position report. Therefore, the machine has not sent any position reports.STOP

  • NOT OK – The machine has moved more than the “Position Report Minimum Location Change” or machine movement is unknown. Proceed to Test Step 3.

Test Step 3. VERIFY THAT THE PRODUCT LINK MODULE IS IN POWER MODE 1.

  1. Select “Status Parameters” for Cat ET.
  1. Verify that the “Power Mode Status” is “Power Mode 1”. Verify that the “Key Switch Status” is “On”.

Expected Result:

The machine is in “Power Mode 1” and “Key Switch On”.

Results:

  • OK – The screens for Cat ET display “Power Mode 1”. Proceed to Test Step 4.

  • NOT OK – Cat ET screens are not correct. Proceed to Test Step 4.

Test Step 4. VERIFY THAT THE GPS RECEIVER FUNCTIONS.

  1. Select “GPS Information” for Cat ET.
  1. Verify that the “GPS Position Status” is “Valid”.
  1. Verify that the GPS has calculated a location within the configured amount of time (“GPS Fix Validity Time Duration”). The “GPS Time Stamp” can be compared to the “PC Current Date/Time” in order to calculate the time since the last calculation of the position.

Expected Result:

The “GPS Position Status” is “Valid”. The last calculation (GPS) of the position was within the configured amount of time (“GPS Fix Validity Time Duration”) in “Power Mode 1”.

Results:

  • OK – The indications on the Cat ET screen are correct. The GPS Receiver is functioning properly. Proceed to Test Step 6.

  • NOT OK – The indications on the Cat ET are incorrect. Proceed to Test Step 5.

Test Step 5. VERIFY THAT THE CENTER CONDUCTOR OF THE ANTENNA HAS NOT SHORTED TO THE SHIELD.

  1. Disconnect the connection of the GPS antenna at the module.
  1. Measure the resistance from the shield of the antenna cable to the conductor at the center of the cable. The shield is the threaded part of the connector.

Refer to Systems Operation, Troubleshooting, Testing and Adjusting, “Reports and Messages Not Available” for the following information:

  • Illustrations that show the resistance checks

  • Listing of resistance checks for the antenna

  • Listing of resistance values

Expected Result:

The resistance for the GPS antenna meets the specifications that are defined in Systems Operation, Troubleshooting, Testing and Adjusting, “Reports and Messages Not Available”.

Results:

  • OK – The resistance is correct. Proceed to Test Step 6.

  • NOT OK – The resistance is incorrect.

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

    STOP

Test Step 6. VERIFY TRANSMISSION OF A MESSAGE.

  1. Monitor the parameters on the “Satellite Information” status screen. Refer to Systems Operation, Troubleshooting, Testing and Adjusting, RENR7911, “Diagnostic Capabilities” for an explanation of the Product Link parameters.
  1. Verify that the “Message Transmission Timestamp” is recent. If the time stamp indicates 1984, the module has never transmitted a message.
  1. Go to the drop-down menu in the Cat ET and select “Service”. Then select “PLM Commands” and “Position Report”. If a message is in the queue, proceed to “Step F”.
  1. Go to “Message Queue” of Cat ET.
  1. Verify that the “Queued Position Report” equals 1.
  1. Go to “Message Queue” of Cat ET.
  1. Verify that the “Queued Position Report” changes to 0 typically within 15 minutes. This signifies that the message has been successfully transmitted.
  1. Go to “Status Parameters” of Cat ET.
  1. Verify the “Primary Communication Link” switches to “On-Line” typically within 15 minutes.

Expected Result:

The “Primary Communication Link” switches to “On-Line” and the “Queued Position Report” is transmitted typically within 30 minutes.

Results:

  • OK – The Product Link appears to be operating properly. Verify that the message was successfully received at the office. Remember that the delay time is dependent on the configuration of the software at the office.STOP

  • NOT OK – There is a problem with the antenna or with the module. Do not replace the module until the antenna and cable are verified.

    Repair: Refer to Systems Operation, Troubleshooting, Testing and Adjusting, “Reports and Messages Not Available”.

    STOP

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