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 434 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

1

I

L

1. Reconnect lead 588 of driver’s instrument

panel wiring harness to FUEL PRIMER

switch.

2. Disconnect lead 76 of bulkhead-to-driver’s

instrument panel wiring harness from FUEL

PRIMER switch.

3. Place red lead of multimeter on FUEL

PRIMER switch and black lead to ground.

4. Turn MASTER and FUEL PRIMER switches

ON and check for voltage.

5. Turn MASTER and FUEL PRIMER switches

OFF.

Is voltage present?

I

I

Replace FUEL PRIMER switch

(para 8-17).

CONTINUED ON NEXT PAGE

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