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 252 of 1275

TM 9-2350-311-20-1

3-3

TROUBLESHOOTING CHART — CONTINUED

1.

AIR CLEANER BLOWER MOTOR CIRCUIT —

(2) ONE BLOWER MOTOR FAILS TO OPERATE

CONTINUED

INITIAL SETUP

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

Multimeters (item 36, Appx H)

TA-1 probe kit (item 43, Appx H)

I

Required

Two

t

Conditions

Engine compartment access cover removed (para 11-5)

Transmission left access door open (TM 9-2350-311-10)

Air intake grille open (TM 9-2350-311-10)

NOTE

Vehicle must be in neutral for the following step.

N

A

1. Disconnect lead 415 from disabled blower

motor.

.

2. Place red lead of multimeters in lead 415 and

black lead to ground.

3. Turn MASTER switch ON and check for

voltage.

4. Turn MASTER switch OFF.

Is voltage present?

Replace air cleaner blower motor

(para 8-36).

accessory control box to heater/

blower wiring harness (para 8-52).

END OF TASK

3-152

Repair or replace lead 415 of