TM-9-2320-279-20-1

M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)

TECHNICAL MANUAL; MAINTENANCE INSTRUCTIONS; ORGANIZATIONAL MAINTENANCE, VOLUME 1 OF 3

TM-9-2320-279-20-1 - Page 346 of 985

TM 9-2320-279-20-1

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Troubleshooting Malfunctions (Cent)

Table 2-9.

Troubleshooting (Cent)

Malfunction

Test or Inspection

Corrective Action

ARCTIC HEATER KIT

2. COOIANT PUMP FAILS TO OPERATE (INDICATOR LIGHT COMES ON).

4

-a

.

4

TA500405

Step 1. Check coolant pump for loose electrical connections.

Tighten loose connections.

Step 2. Check voltage at coolant pump. Place positive (+) probe at terminal No. 4. Place negative (-) probe

on known good ground.

If 24 vdc is present, go to Step 3.

If 24 vdc is not present, repair or replace wire No. 1530 (para 20-2).

Step 3. Perform continuity check on ground wire No. 1317 of coolant pump.

If continuity is present, repair or replace coolant pump (para 20-2).

If continuity is not present, repair or replace wire No. 1317.

Step 4. If problem has not been solved, notify the supervisor.

Change 2

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