G3520B Industrial Engines Caterpillar

The Integrated Temperature Sensing Module (ITSM) contains no moving parts. Replacement of the ITSM can be a time consuming task. Before you replace an ITSM, follow the troubleshooting procedures in this manual in order to be sure that replacement of the ITSM will correct the problem.

Note: Replacement of the ITSM will require a service technician from an authorized dealer of Caterpillar. The required flash file will not be installed on a new ECM.

Use the following guidelines to verify that the suspect ITSM is the cause of the problem:

Install another ITSM in place of the suspect ITSM for testing purposes. Transfer the software from the suspect ITSM to this ITSM. Program all of the parameters in order to match the parameters of the suspect ITSM. The parameters must match. Refer to the following steps for details on programming the parameters.

If replacement of the ITSM resolves the problem, reconnect the suspect ITSM. Verify that the problem recurs. If the problem recurs, replace the suspect ITSM with a new control module.

Use the following procedure to replace the ITSM:

Note: If the parameters cannot be read from the suspect ITSM, the parameters must be obtained from records or from the factory.

1. Use the "Service/Copy Configuration/Electronic Control Module (ECM) Replacement" function of the Caterpillar Electronic Technician (ET) in order to transfer the software from the suspect ITSM.

   You may also select the "Print" function in order to obtain a paper copy of the parameter settings.

   Note: Before you replace an ITSM, record all of the logged events.

   1. Connect Cat ET with the communications adapter. Select "Service/Copy Configuration/ECM Replacement" from the drop-down menu.

      Cat ET will load the configuration parameters and the monitoring parameters from the ITSM.

   2. Select "Load from ECM" in the lower left corner of the screen. Select the suspect ITSM and select "OK".

      After the loading is complete, Cat ET will display this message: "The data has been successfully loaded from the ECM". Select "OK".

   3. Select "File/Disconnect F8" from the drop-down menu.

      Note: Do not exit from Cat ET.

2. Replace the ITSM.

   1. Set the engine control to the OFF/RESET position.

   2. Remove the electrical power from the engine.
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   Illustration 1	g01410180
   Connectors for the ITSM (typical example) (1) Connectors for the harness to the exhaust temperature sensors (2) Integrated Temperature Sensing Module (ITSM) (3) Connectors for the harness to the terminal box for the master ECM

   3. Disconnect harness connectors (1) and (3) from the ITSM.
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   Illustration 2	g01592061
   Mounting hardware for the ITSM (4) Nut (5) Ground strap (6) Washer (7) Mounting group (8) Grounding stud

   Note: One of the mounts for the ITSM has a ground strap that is attached between the nut and the washer. Remove any paint or buildup of debris from the mounting location that is for the ITSM or the mounting group in order to ensure that a good ground connection is made.

   4. Remove the 4 nuts (4) and washers (5) from mounting groups (7) of the ITSM. Ground strap (6) must also be detached from one of the studs.

   Note: The mounting groups (7) for the ITSM are held in place on the mounting studs. The rubber grommets of the mounting groups help to reduce vibration. The grommets may fall when the ITSM is removed. Be sure not to lose the grommets.

   5. Remove the ITSM from the engine.

3. Install the replacement ITSM onto the engine.

   1. Use the mounting hardware to install the new ITSM. Be sure to install ground strap (6) .

      Note: Ensure that the nut for the grounding stud (8) is tight.

      Check the mounting hardware and the ITSM for correct installation. A properly installed ITSM will move slightly on the rubber grommets. If the ITSM cannot move slightly on the grommets, check that the washers and grommets are positioned correctly.

   2. Install connectors (1) and (3) to the ITSM.

4. Program the configuration parameters and the monitoring system parameters into the replacement ITSM.

   1. Restore the electrical power to the engine.

   2. Set the engine control to the STOP position.

   3. Select "File/Select ECM" from the drop-down menu of Cat ET.

   4. Select the "Replacement ITSM" and click "OK".

   5. Select "Service/Copy Configuration/ECM Replacement" from the drop-down menu. Click "OK" on the window.

   6. Select "Program ECM" from the lower left corner of the screen. Select the replacement ITSM and click "OK".

   7. After the loading is complete, a window with the message "Programming Complete" will appear. Select "OK".

      Note: When you program a new ITSM, factory passwords are not required. Also, the ITSM does not require calibration.