HYDRAULIC SUSPENSION LOCKOUT WILL NOT ENGAGE (HMMH) (REG. NO. UC053E THRU UC053K) cont'd -680640379

TM 5-2420-224-20-1

Table 3-5. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

ELECTRICAL SYSTEM (CONT)

Step 33. Check for +24 VDC between wire (42) and wire (43) and ground at

connector AB (24).

If +24 VDC is present, repair wiring (42) and wiring (43)

between connector AB and fuse box 3.

If +24 VDC is not present, go to step 34.

Step 34. Check for +24 VDC between wire (42) and wire (43) and ground at cab

floor separation point (25).

If +24 VDC is not present, repair wiring (42) and wiring (43)

between NATO slave receptacle and cab floor separation point.

If +24 VDC is present, repair wiring (42) and wiring (43)

between cab floor separation point and connector AB.

Step 35. Check for +24 VDC between wire (6) and ground at conneotor W (44).

If +24 VDC Is present, repair wiring (6) between D+ relay and

connector W.

If +24 VDC is not present, go to step 36.

Step 36. Check for +24 VDC between wire (6) and ground at relay K2 (45).

If +24 VDC is not present, perform Malfunction 2.

If +24 VDC is present, repair wiring 286 between connector W

and relay K2.

Step 37. Check for +24 VDC between wire (46) and wire (47) and ground at motor

relay (22).

If +24 VDC is not present, go to step 41.

If +24 VDC is present, go to step 38.

Step 38. Check for +24 VDC between wire (46) and wire (47) and ground at

connector AA (48).

If +24 VDC is not present, repair wiring (46) and wiring (47)

between motor relay and connector AA.

If +24 VDC is present, go to step 39.

Step 39. Check for +24 VDC between wire (46) and wire (47) and ground at cab

floor separation point (25).

If +24 VDC is not present, repair wiring (46) and wiring (47)

between connector AA and cab floor separation point.

If +24 VDC is present, go to step 40.

3-249