TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
Page 324 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 B I I G 1. Reconnect lead 36 to ENGINE OIL PRESSURE gage. 2. Disconnect battery ground leads. 3. Disconnect bulkhead-to-portable instrument panel harness from portable instrument panel disconnect. 4. Place jumper wires from socket P (lead 459B) to socket C (lead 459) and from pin A to socket A (lead 27). 5. Reconnect battery ground leads. 6. Turn MASTER switch ON and check ENGINE OIL PRESSURE gage for reading. 7. If ENGINE OIL PRESSURE gage shows a maximum reading, place a jumper wire from pin D (lead 36) to ground. 8. Check gage for reading. 9. Turn MASTER switch OFF. Does ENGINE OIL PRESSURE gage show minimum when grounded and maximum when not grounded? Repair or replace lead 36 from portable instrument panel wiring harness (para 8-57). CONTINUED ON NEXT PAGE 3-224