Landfill Compactors, Soil Compactors, Wheel Dozers, and Wheel Loaders VIMSTM 3G Caterpillar

Using Cat^® Electronic Technician (Cat ET) to Determine Diagnostic Trouble Codes (DTCs)

Perform the following:

1. Connect Cat^® Electronic Technician (Cat ET) to the machine.

2. Turn the key start switch to the RUN position.

3. Start Cat ET.

   After Cat ET is started, communications with the electronic control modules (ECMs) on the machine will be established.

   Cat ET will list the ECMs.

4. Choose the desired ECM.

   Cat ET will determine the diagnostic trouble codes (DTCs).

5. See the test procedure for the corresponding DTC.

Reference: Troubleshooting, "Service Tools"

Diagnostics are logged in non-volatile memory. On powerup, the ECM will clear any DTCs that have not been detected or active within the last 150 hours of machine operation.

Active DTCs

Illustration 1	g02625416
Typical Cat® Electronic Technician (Cat ET) Service Tool screen for active DTCs

The following procedures may cause new DTCs to be logged. Before any procedures are performed, make a list of all the active DTCs. When each procedure is complete, clear the DTCs that were caused by the procedure.

Note: Before performing a procedure, always check all the circuit breakers. Repair the cause of any tripped circuit breaker.

Cat ET displays active DTCs. Active DTC data includes:

• Component identifier (CID)

• Failure mode identifier (FMI)

• Text description of the problem

Logged DTCs

Illustration 2	g02625437
Typical Cat ET screen for logged DTCs

Cat ET displays logged DTCs. Intermittent problems are shown as logged DTCs. The logged DTC data includes the following:

• Component identifier (CID)

• Failure mode identifier (FMI)

• Text description of the problem

• Number of occurrences of the problem

• Time stamp of the first occurrence of the problem

• Time stamp of the most recent occurrence of the problem