LINE-F INJ-YM 3731898 - Caterpillar

General Information
The Electrical System Schematic, Parts Manual and Operation and Maintenance Manual for the machine that is being serviced should be used to locate electrical components and connectors.The following information is a guide to reading the tables on the back of the Electrical System Schematic.
The "Component Location" table uses white circles to mark the locations in the profile of the machine and in the area views. Alphabetical letters in the "Machine Location" column indicate a general area of the machine. Refer to the corresponding footnote at the end of the table for a description of the location.
The "Harness Connector Location" table uses white circles to mark the locations in the general view and in the area views. Alphabetical letters in the "Machine Location" column indicate a general area of the machine. Refer to the corresponding footnote at the end of the table for a description of the location.Note: The "Harness Connector Location" table uses black circles on certain electrical system schematics. Connector Contact Numbers for the Main Display Module
Illustration 1 g00309228
Connector of the main display module
Service Connector
The service connector provides access to the service and clear inputs of the main display module. Connector contact 1 is the service input and contact 2 is the clear input. Contacts 3 and 4 could be any wire from the 200 family. The service connector is usually located under the dashboard within the operator compartment. The service connector is a DT type of connector. For a more accurate location of the service connector, see the Electrical System Schematic in the Service Manual.
Illustration 2 g00309224
Service connector with jumpers (typical example)
(1) Jumper. Service contact grounded (2) Jumper. Clear contact grounded (3) Service connector.
Illustration 3 g00309227
End view of service connectors
Various diagnostic functions require the grounding and/or the opening of the service and clear contacts at the service connector. During troubleshooting, it is necessary for the service person to make the proper electrical connections between the contacts of the service connector.