TM-9-2350-311-20-1

TM 9-2350-311 -20-1

3-1 GENERAL TROUBLESHOOTING INSTRUCTIONS

a. General

This chapter contains a Quick Guide to Troubleshooting index and a Troubleshooting Chart. The Quick Guide to

Troubleshooting is the master reference table for locating troubleshooting information. The Quick Guide to

Troubleshooting index contains a list of various malfunctions which may occur during operation or inspection of the

M109A2/M109A3/M109A4/M109A5 Howitzers and provides a reference to the troubleshooting information in the

troubleshooting chart or a solution. The troubleshooting chart provides step-by-step instructions for isolating and

correcting malfunctions.

WARNIN G

b. STE/lCE-R

Protective radiator fan screens must be installed prior to troubleshooting in the engine

compartment when the engine is running or when the engine is in ground hop mode.

Contact with a rotating fan can cause severe injury (para 4-5).

Troubleshooting

When a malfunction is recognized on the engine systems of the M109A2/M109A3/M109A4/M109A5 Howitzers, the

Quick Guide to Troubleshooting may reference an Appendix I NO-GO CHAIN. This means there is a STE-ICE-R method

for analyzing the malfunction. The STE/lCE-R method will be the primary troubleshooting procedure when referenced;

the backup procedure should be used only when STE/lCE-R is unavailable.

c. Electrical Troubleshooting

Electrical troubleshooting in this chapter includes schematic diagrams and pictorial diagrams to give insight to the

harnesses involved.

When troubleshooting any electrical system or component, exercise care to prevent electrical shock.

Ensure MASTER switch is OFF between every step unless otherwise directed

throughout troubleshooting of the electrical system or electrical components. Remove

all jewelry and metal objects when working on electrical systems to prevent injury due

to electrical shock.

The multimeter is used throughout electrical troubleshooting. For a quick reference to multimeter operation, see para 2-

12. STE/lCE-R can also perform as a multimeter and instruction on its use is in TM 9-4910-571-12&P.

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