Illustration 1 | g01043850 |
Location of the Power Train ECM (1) Cover |
Illustration 2 | g01043848 |
(2) Power Train Electronic Control Module (ECM) |
Power Train Electronic Control Module (ECM) (2) is mounted in the operator station. Power Train ECM (2) is protected by cover (1) that must be removed in order to obtain access. The Power Train ECM is an environmentally sealed unit.
Illustration 3 | g01043849 |
(3) Power socket plug (4) Caterpillar Electronic Technician (ET) service port (5) Service connector port |
Caterpillar Electronic Technician (ET) service port (4), service connector port (5) and power socket plug (3) are located on the dash.
ET connects to ET service port (4) .
The 4C-8195 Control Service Tool connects to service connector port (5) .
Power socket plug (3) is a 12 VDC supply for a personal computer.
General Information
The Electrical System Schematic, Electrical System Schematic Supplement, 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 Electrical System Schematic Supplement for the machine that is being serviced.
- The "Component Location" table uses two columns to identify the locations of the components. In the column titled "Schematic Location" the alphabetical and numerical characters are a grid reference on the Electrical System Schematic. In the column titled "Machine Location" the numerical characters are a reference to the illustration titled "Machine Harness Connector And Component Location" on the Electrical System Schematic Supplement.
- The "Harness Connector Location" table uses two columns to identify the locations of the harness connectors. In the column titled "Schematic Location" the alphabetical and numerical characters are a grid reference on the Electrical System Schematic. In the column titled "Machine Location" the numerical characters are a reference to the illustration titled "Machine Harness Connector And Component Location" on the Electrical System Schematic Supplement.
Connector Contact Numbers
Illustration 4 | g00279578 |
Power Train ECM (1) Connector J1 (2) Connector J2 |
Illustration 5 | g00279579 |
Power Train ECM (3) Screw |
Illustration 6 | g00517682 |
The ECM side of the ECM connector |
Illustration 7 | g00517681 |
The wire side of the ECM connector |
To remove the machine harness from the Power Train ECM, use screw (3) in the center of the harness connector.
Service Connector
The service connector provides access to the service and clear inputs of the main display module. Connector contact "J" is the service input and contact "H" is the clear input. Contacts "F" and "G" could be any wire from the 200 family. The service connector is located on the dash in the operator station. The service connector is a DT type of connector. For a more accurate location of the service connector, see the Electrical System Schematic Supplement in the Service Manual.
Illustration 8 | g00778340 |
Service connector with jumpers (typical example) (1) Jumper. Service contact grounded (2) Jumper. Clear contact grounded (3) Service connector |
Illustration 9 | g00783862 |
End view of service connector |
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. These electrical connections are made with two jumpers. See Troubleshooting, "Service Tools".