LOW OIL PRESSURE AND HIGH WATER TEMPERATURE ALARM WILL NOT SOUND WITH PRESS-TO-TEST SWITCH DEPRESSED cont'd -680640346

TM 5-2420-224-20-1

Table 3-5. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

ELECTRICAL SYSTEM (CONT)

Step 7. With warning delay relay connector (5) disconnected, check for +24 VDC

between wire 302 (8) and ground at warning delay relay connector.

If +24 VDC is not present, repair wiring 302 between warning

delay relay connector and fuse box 1.

If +24 VDC is present, reconnect warning delay relay connector

and go to step 8.

Step 8. Check for +24 VDC between wire 303 (9) and ground at warning delay relay

connector (5).

If +24 VDC is not present, replace warning delay relay

(page 4-141).

If +24 VDC is present, go to step 9.

Step 9. Disconnect connector A (10) and check for +24 VDC between wire 303 (9)

and ground.

If +24 VDC is not present, repair wiring 303 between

connector A and warning delay relay.

If +24 VDC is present, reconnect connector A and go to step 10.

Step 10. Disconnect connector X (11) and check for +24 VDC between wire 303 (9)

and ground.

If +24 VDC is not present, repair wiring 303 between

connector X and connector A.

If +24 VDC is present, reconnect connector X and go to step 11.

Step 11. Check for +24 VDC between wire 303 (9) and ground at low oil pressure

and high water temperature alarm (12).

If +24 VDC is not present, repair wiring 303 between low oil

pressure and high water temperature alarm and connector X.

If +24 VDC is present, replace low oil pressure and high water

temperature alarm (page 4-170).

Step 12. Connect jumper between wire 304 (13) and ground at oil pressure sender (14).

Step 13. Disconnect warning delay relay connector (5) and check for continuity

between wire 304 (13) and ground.

If there is continuity, reconnect warning delay relay connector,

remove jumper, and replace oil pressure sender (page 4-202)

or water temperature sending unit (page 4-203).

If there is no continuity, reconnect warning delay relay

connector and go to step 14.