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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 -680640284
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
NOTE
Vehicle MASTER disconnect switch must be ON and ignition switch set to ON.
Failure to do so will cause erroneous results.
Engine temperature must be below 32F (0C) and starter switch must be
depressed for cold start system to operate.
Refer to wiring diagram (page 3-155) for all wiring repair steps.
Step 1. Check ether supply bottle.
If ether supply bottle is empty, replace bottle (page 4-55).
If ether supply bottle is not empty, go to step 2.
Step 2. Loosen two captive screws (1) and pull bracket (2) out enough to gain
access to area behind bracket.
Step 3. Remove two clamps (3) and pipe assembly (4).
Step 4. Check for +24 VDC between wire 28 (5) and ground at cold start switch (6).
If +24 VDC is not present, repair wiring 28 between cold start
switch and starter switch.
If +24 VDC is present, go to step 5.
Step 5. Engage cold start switch (6) and check for +24 VDC between wire 283 (7)
and ground at cold start switch.
If +24 VDC is not present, replace cold start switch
(page 4-136).
If +24 VDC is present, go to step 6.
Step 6. Check for +24 VDC between wire 283 (7) and ground at fuse box 1 (8).
If +24 VDC is not present, repair wiring 283 between fuse box
1 and cold start switch.
If +24 VDC is present, go to step 7.
Step 7. Disconnect connector E (9) and check for +24 VDC between wire 284 (10)
and ground.
If +24 VDC is not present, repair wiring 284 between
connector E and fuse box 1.
If +24 VDC is present, reconnect connector E and go to step 8.
3-153

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