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 322 of 1275

TM 9-2350-311 -20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

r.

ENGINE OIL PRESSURE GAGE CIRCUIT —

ENGINE OIL PRESSURE INDICATOR FAILS TO

CONTINUED

OPERATE WITH ENGINE RUNNING; ALL OTHER

INSTRUMENTS OPERATE — CONTINUED

CONTINUED FROM STEP C

I

D

1. Reconnect lead 27 to ENGINE OIL

PRESSURE gage.

2. Disconnect battery ground leads.

3. Disconnect portable instrument panel

wiring harness from portable instrument

panel disconnect.

4. Place a jumper wire from socket P (lead

459B) to socket C (lead 459).

5. Place red lead of multimeters in socket A

(lead 27) and black lead to ground.

6. Reconnect battery ground leads.

7. Turn MASTER switch ON and check for

voltage.

8. Turn MASTER switch OFF.

Is voltage present?

1

Repair or replace lead 27 from ‘

portable instrument panel wiring

harness to ENGINE OIL PRESSURE

indicator (para 8-57).

1

CONTINUED ON NEXT PAGE

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