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 284 of 1275

TM 9-2350-311 -20-1

3-3 TROUBLESHOOTING CHART —

CONTINUED

o. ENGINE WATER TEMP INDICATOR CIRCUIT —

(1) ENGINE WATER TEMP INDICATOR NEEDLE FAILS

CONTINUED

TO MOVE OR IS UNSTEADY; ALL OTHER GAGES

OPERATE PROPERLY

INITIAL SETUP

Tools

Personnel Required

General mechanic’s tool kit (item 64, Appx H)

Two

Multimeter (item 36, A

PPX

H)

TA-1 probe kit (item 43, A

PPX

H)

. .

Equipment Conditions

(Long test leads may be needed for some tests;

Engine access door open (TM 9-2350-311-10)

16 AWG wire maybe used as an extension.)

Transmission access doors open (TM 9-2350-311-10)

Portable instrument panel cover removed (para 8-17)

1. Disconnect lead 33A from engine coolant

temperature transmitter.

2. Turn MASTER switch ON and check

ENGINE WATER TEMP gage for a

reading.

3. If ENGINE WATER TEMP gage shows a

minimum reading, place a jumper wire from

lead 33A to ground.

4. Check ENGINE WATER TEMP gage for

reading.

5. Turn MASTER switch OFF.

Does ENGINE WATER TEMP gage show minimum

when not grounded, and maximum when grounded?

I

transmitter

(para 8-6).

Replace engine coolant temperature

CONTINUED ON NEXT PAGE

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