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 440 of 1275

TM9-2350-311 -20-1

3-3 TROUBLESHOOTING CHART —

CONTINUED

ae. ELECTRIC FUEL PUMP CIRCUIT —

CONTINUED ENGINE MISSES WHEN LOW ON FUEL; ONE OR BOTH

FUEL PUMPS FAIL TO OPERATE — CONTINUED

CONTINUED FROM STEP K

U

1

“

2.

3.

4.

5.

Reconnect lead 588 to driver’s instrument

panel wiring harness to FUEL PRIMER

switch.

Disconnect lead 588 of driver’s instrument

panel wiring harness from circuit breaker

output.

Place red lead of multimeter on circuit

breaker output and black lead to ground.

Turn MASTER switch ON and check for

voltage.

Turn MASTER switch OFF.

i

Is voltage present?

I

I

I

I

Repair or replace lead 588 of driver’s

I

instrument panel wiring harness

(para 8-51).

V

1. Reconnect lead 588 of driver’s instrument

panel wiring harness to circuit breaker.

2. Disconnect lead 10 of circuit breaker-to-”Y”

connector lead from circuit breaker

input.

3. Place red lead of multimeter in lead 10 and

black lead to ground.

4. Turn MASTER switch ON and check for

voltage.

5. Turn MASTER switch OFF.

Is voltage present?

I

1

Replace circuit breaker (para 8-33,

M109A2/M109A3; 8-34, M109A4/

M109A5).

,

CONTINUED ON NEXT PAGE

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