938G Wheel Loader, 938G Series II Wheel Loader, IT38G Integrated Toolcarrier and IT38G Series II Integrated Toolcarrier Traction Control System Service Tools Caterpillar

The following service tools should be used to aid in troubleshooting the electrical system.

The operator switch, clear switch and service switch are mounted on the machine.

Illustration 1	g00280782
Connections for the Electronic Technician (ET) The components that are needed in order to use the AVS Electronic Technician in order to determine diagnostic codes are listed: (1) An IBM-COMPATIBLE personal computer with an installed current version of AVSpare Electronic Technician software (2) 139-4166 Data Link Cable or 7X-1570 Data Link Cable (3) 7X-1425 Cable and 4C-6805 Adapter (4) Special Publication, JEBD3003, Special Publication, JERD2124, Special Publication, JERD2129 ; AVSpare Electronic Technician software (5) 7X-1700 Communication Adapter Tool with Special Publication, NEXG4323, "Communications Adapter Software"

Illustration 2	g00774942
Connections for the Communication Adapter II and the Electronic Technician (ET) The components that are needed in order to use the Communication Adapter II and the AVS Electronic Technician in order to determine diagnostic codes are listed: (6) Cable (7) 171-4400 Communication Adapter II (8) Service diagnostic cable. (9) Current version of AVSpare Electronic Technician software and an IBM-COMPATIBLE personal computer

Reference: See Special Publication, NEHS0758, "Communications Adapter II User's Manual Contains Software".

Note: AVSpare Electronic Technician (ET) is a software program that can be used on an IBM compatible personal computer.

In order to use the AVSpare Electronic Technician (ET), order the following materials: Special Publication, JERD2124, "ET Single Use Program License", Special Publication, JEHP1026, "Information and Requirements Sheet", 7X-1425 Data Link Cable and the Data Subscription and Special Publication, JERD2142, "Data Subscription". The Special Publication, JEHP1026, "Information and Requirements Sheet" lists the required hardware and the features of the ET.

The Electronic Technician (ET) is not required in order to determine the diagnostic codes. The Electronic Technician (ET) is not required in order to clear the diagnostic codes. However, the process of determining the diagnostic codes is easier and faster by using the ET. The ET can also display information on the history of a diagnostic code and the parameter status of diagnostic codes. These features allow the ET to be a useful tool for troubleshooting.

The Electronic Technician (ET) is used to communicate to the electronic control module over the data link by connecting to the machine diagnostic connector. For more information and the locations of the connectors, see Troubleshooting, "Electrical Components and Connector Locations" and the Electrical System Schematic in your machine's Service Manual.

For instructions on servicing Sure Seal connectors, see Special Instruction, SMHS7531. For instructions on servicing Deutsch DT connectors, see Special Instruction, SEHS9615.

Use the digital multimeter for making continuity checks or for measuring voltage. For instructions about the use of the 6V-7070 Digital Multimeter, see Special Instruction, SEHS7734. The 7X-1710 Multimeter Probe measures the voltage at the connectors without disconnecting the connectors. The probe cables are pushed into the back of the connector along the wire. The 8T-8726 Adapter Cable has a three pin DT breakout. The adapter cable is used for measurements in the sensor circuits.

Note: Except for harness tests, using continuity testers such as the 8T-0500 Continuity Tester or voltage testers such as the 5P-7277 Voltage Tester is not recommended for today's AVSpare electrical circuits.