D3G, D4G and D5G Track-Type Tractors Electrohydraulic Caterpillar

Connect the ET to the machine. Turn the key switch to the RUN position. Start the ET. The ET will initiate communications with the Electronic Control Modules on the machine. After communication has been established, the ET will list the Electronic Control Modules on the machine. Choose the desired Electronic Control Module. After the service codes have been determined with CAT ET, see the test procedure for the corresponding service code.

ReferenceTroubleshooting, "Service Tools"

Active Diagnostic Codes

Illustration 1	g00788556
Typical ET screen for active diagnostic codes

A screen is provided in ET for active diagnostic codes. Active diagnostic information shall include a component identifier (CID), a failure mode identifier (FMI) and a text description of the problem.

Logged Diagnostic Codes

Illustration 2	g00788555
Typical ET screen for logged diagnostic codes

A screen is provided in ET for logged diagnostic codes. The screen will display diagnostic codes that are currently active. The screen will display diagnostic codes that have been active within the last 100 hours of machine operation. The ECM will only display 127 occurrences of the code. The ET will log diagnostic codes that are intermittent. The logged diagnostic data will include a component identifier (CID), a failure mode identifier (FMI), and a text description of the problem. Also, the logged diagnostic data will include the number of occurrences of the problem and two time stamps. The time stamp displays the first occurrence of the problem and the time stamp displays the most recent occurrence of the problem.

Diagnostics are logged in non-volatile memory. On powerup, the ECM will clear the diagnostic codes that have not been detected or active within the last 100 hours of machine operation.