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 326 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 H

T

-

1 Reconnect engine disconnect-to-bulkhead

2.

3.

4.

5.

6.

wiring harmess to drivers bulkhead.

Disconnect engine disconnect-to-bulkhead

wiring harness from engine disconnect.

Turn MASTER switch ON and check

ENGINE OIL PRESSURE gage for a

reading.

If ENGINE OIL PRESSURE gage shows a

maximum reading, place a jumper wire from

socket D (lead 36) to ground.

Check gage for reading.

Turn MASTER switch OFF.

Does ENGINE OIL PRESSURE gage show minimum

when grounded and maximum when not grounded?

I

Repair or replace lead 36 from engine

disconnect-to-bulkhead wiring harness

(para 8-45, M109A2/M109A3; para

8-46, M109A4/M109A5).

Repair or replace lead 36 of powerplant

wrong harness (para 8-43, M109A2/

M109A3; para 8-44, M109A4/M109A5).

END OF TASK

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