TM 5-3805-294-23-4
FIELD MAINTENANCE
ENGINE CONTROL UNIT (ECU) REPLACEMENT
INITIAL SETUP:
Equipment Condition
Tools and Special Tools
Machine safely parked and shut down
Tool Kit, General Mechanic's: Automotive (Volume
(TM 5-3805-294-10). (Volume 5, WP 0794)
5, WP 0796, Table 2, Item 119)
Negative battery cable disconnected. (WP 0521)
Materials/Parts
Tags (Volume 5, WP 0797, Table 1, Item 52)
Time to Complete
0.5 Hour(s)
Personnel Required
Construction Equipment Repairer 91L (1)
References
TM 5-3805-294-24P: Fig. 78 (Volume 5,
WP 0794)
DA FORM 5988-E or DA FORM 2404 (Volume 5,
WP 0794)
REMOVAL
WARNING
Ensure electrical power is off prior to working on all electrical connections. Prior to working
on or around vehicle, remove all jewelry, such as rings, ID tags, bracelets, etc. Jewelry, and
tools can catch on equipment, contact positive electrical circuits, and cause a direct short,
severe burns, or electrical shock. Failure to comply may result in injury or death to personnel.
NOTE
The sealed ECU is the system component least likely to fail. Ensure that it is isolated and
identified as the defective component before replacing.
Tag and mark wires, connectors, and wiring harnesses prior to removal to ensure proper
installation.
1.
Disconnect wiring harness connector J01 (Figure 1, Item 1) from ECU (Figure 1, Item 2).
0508-1