10
TM 5-3805-290-23-1
HOW TO USE ON-BOARD DIAGNOSTICS
THIS WORK PACKAGE COVERS
General, Understanding the Diagnostic Code Breakdown, Displaying Fault Codes on Instrument Panel, Diagnostic
Codes, Failure Mode Identifiers (FMIs)
INITIAL SETUP
Equipment Conditions
Maintenance Level
Unit
Machine parked on level ground (TM 5-3805-290-
10)
Test Equipment
Test set, electronic systems (MSD) (Item 91, WP
Work tool lowered to ground (TM 5-3805-290-10)
Parking brake engaged (TM 5-3805-290-10)
Tools and Special Tools
Wheels chocked
Adapter, communication (Item 2, WP 0205 00)
Software kit (Item 81, WP 0205 00)
Battery disconnect switch in OFF position (TM 5-
3805-290-10)
Personnel Required
Engine start switch on OFF position (TM 5-3805-
MOS 62B, Construction Equipment Repairer
290-10)
References
Drawings Required
TM 5-3805-290-23P, Figure 173
GENERAL
The 924G Wheel Loader has two ECMs: Engine and Machine/Powertrain. Each ECM generates diagnostic codes to
indicate that an ECM has detected an electrical or electronic problem which may affect system performance. Often, these
codes are generated even before operator notices a difference in performance. Diagnostic codes may also indicate the cause of
a problem.
If fault codes are logged or active on your machine, but no troubleshooting steps appear in this manual, contact your
local Caterpillar dealer.