TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 1181 of 1275

TM9-2350-311-20-1

I-4 STE/lCE-R ENGINE TROUBLESHOOTING METHOD

The STE/lCE-R engine troubleshooting method uses only the NO-GO chains. When a malfunction in the engine is

recognized by the mechanic, the “Guide to Troubleshooting” will provide a reference to a specific NO-GO CHAIN to

isolate the cause of the malfunction. To start the STE/ICE-R engine troubleshooting method, do the following:

a. Perform GO 1 CHAIN

First, perform GO 1 CHAIN to set up STE/lCE-R and check to see if it is in working order.

b. Perform NO-GO CHAIN

Now that STE/ICE-R is hooked up properly and checks out, perform the NO-GO CHAIN cited in the “Quick Guide

to Troubleshooting.”

The rules to follow when using STE/ICE-R engine troubleshooting method are:

1 Never enter in the middle of a NO-GO CHAIN.

2 Follow each instruction in a GO CHAIN. Do not skip any instructions or procedures.

3 After correcting a problem with a NO-GO CHAIN, test-run the component, engine, or powerplant to ensure the

problem does not still exist.

I-5 GO CHAINS AND NO-GO CHAINS

a. GO CHAINS

GO CHAINS are shown in Figure 2, sheets 1 thru 20.

b. NO-GO CHAINS

NO-GO CHAINS are shown in Figure 3, sheets 1 thru 36.

I-4