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 428 of 1275

TM 92350-311 -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 C

D

1. Reconnect bulkhead-to-portable instrument

panel wiring harness to driver's bulkhead.

2. Disconnect battery ground leads.

3. Disconnect driver’s bulkhead-to-master relay

wiring harness from engine disconnect

bracket.

4. Place red lead of multimeter in socket B (lead

76B) and black lead to ground.

5. Reconnect battery ground leads.

6. Turn MASTER switch ON and check for

voltage.

7. Turn MASTER switch OFF.

I

Is voltage present?

I

Repair or replace lead 76B of driver's bulkhead-

to-master relay wiring harness (para 8-45,

M109A2/M109A3; 8-46, M109A4/M109A5).

1

I Repair or replace lead 76B of powerplant I

wiring harness (para 8-43, M109A2/

M109A3; 8-44, M109A4/M109A5).

3-328