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COLD START SYSTEM WILL NOT OPERATE. cont'd -680640283
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TM-5-2420-224-20-1 Tractor Wheeled 4x4 DED Small Emplacement Excavator (SEE) and High Mobility Material Handler (HMMH) Manual
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COLD START SYSTEM WILL NOT OPERATE. cont'd -680640285
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
Step 8. Check for +24 VDC between wire 284 (10) and ground at engine
temperature switch (11).
If +24 VDC is not present, repair wiring 284 between engine
temperature switch and connector E.
If +24 VDC is present, go to step 9.
Step 9. Check for +24 VDC between wire 286 (12) and ground at engine
temperature switch (11).
If +24 VDC is not present, remove screw (13) and lock washer
(14) and replace engine temperature switch (11).
If +24 VDC is present, go to step 10.
Step 10. Disconnect connector E (9) and check for +24 VDC between wire 286 (12)
and ground.
If +24 VDC is not present, repair wiring 286 between
connector E and engine temperature switch.
If +24 VDC is present, reconnect connector E and go to
step 11.
Step 11. Disconnect connector F (15) and check for +24 VDC between wire 286 (12)
and ground.
If +24 VDC is not present, repair wiring 286 between
connector F and engine temperature switch.
If +24 VDC is present, reconnect connector F and go to
step 12.
Step 12. Disconnect connector W (16) and check for +24 VDC between wire 286
(12) and ground.
If +24 VDC is present, replace cold start aid (page 4-55).
If +24 VDC is not present, repair wiring 286 between
connector W and connector F.
3-154

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