Hydraulic Suspension LOCKOUT WILL NOT ENGAGE (HMMH). cont'd

5-2420-224-20-1

Table 3-5. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

ELECTRICAL SYSTEM (CONT)

Step 9. While holding control switch (5) completely out, check for +24 VDC between

wire 714 (9) and ground at D+ relay (7).

If +24 VDC is not present, repair wiring 714 between control

switch and D+ relay.

If +24 VDC is present, go to step 10.

Step 10. While holding control switch (5) completely out, check for +24 VDC

between wire 72 (15) and ground at D+ relay (7).

If +24 VDC is present, go to step 12.

If +24 VDC is not present, go to step 11.

Step 11. Check wire 03 (14) at D+ relay (7) for continuity to ground.

If open to ground, repair wiring 03 between D+ relay and

ground at NATO slave receptacle.

If short to ground, replace D+ relay.

Step 12. Check for +24 VDC between wire 72 (15) and ground at solenoid relay (13).

If +24 VDC is not present, repair wiring 72 between solenoid

relay and D+ relay.

If +24 VDC is present, go to step 13.

Step 13. Check for +24 VDC between wire 721 (16) and ground at solenoid relay

(13).

If +24 VDC is not present, repair wiring 721 at solenoid relay.

If +24 VDC is present, go to step 14.

Step 14. Check for +24 VDC between wire 722 (17) and ground at indicator light

(18).

If +24 VDC is not present, repair wiring 722 between solenoid

relay and indicator light.

If +24 VDC is present, go to step 15.

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