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 430 of 1275

TM 9-2350-311 -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 E

F

1. Leave in-tank fuel pump lead assembly

disconnected from relay.

2. Disconnect lead 76 of in-tank fuel pump lead

assembly from "Y” connector.

3. Place a jumper wire from socket A (lead 10)

to socket C (lead 76).

4. Place red lead of multimeter in lead 76

and black lead to ground.

5. Turn MASTER switch ON and check for

voltage.

6. Turn MASTER switch OFF.

Is voltage present?

Repair or replace lead 76 of in-tank fuel

pump lead assembly (para 8-73).

A

G

1. Reconnect lead 76 of in-tank fuel pump lead

assembly to "Y“ connector.

2. Disconnect lead 76 of circuit breaker lead

assembly from“Y"connector.

3. Place red lead of multimeter in “Y” connector

and black lead to ground.

4. Turn MASTER switch ON and check for

voltage.

5. Turn MASTER switch OFF.

Is voltage present?

1

I

I

Replace ‘Y” connector (para 8-54).

CONTINUED ON NEXT PAGE

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