CX28, CX31 and CX35 On-Highway Transmissions Power Train Electronic Control System Caterpillar

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 vehicle and in the area views. Alphabetical letters in the "Machine Location" column indicate a general area of the vehicle. 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 vehicle. Refer to the corresponding footnote at the end of the table for a description of the location.

Illustration 1	g01522216
(5) J3 Connector (6) J2 Connector (7) J1 Connector

Harness Connectors

Illustration 2	g01255959
Electronic Control Unit (ECU)

Illustration 3	g01255962
J1 and J2 Harness Connectors that mate to the ECU

OEM Connector

This connector routes power and switch inputs to the ECU. Crimping and wire specifications for this connector are similar to the 70 terminal connector. The figures below show pin, socket locations, and keys for the 24-pin connector.

Illustration 4	g01255115
J3 Harness Connector