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 161 of 985

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cont)

Table 2-9. Troubleshooting (Cont)

Malfunction

Test or inspection

Corrective Action

ENGINE (CONT)

8. ENGINE SPEED CONTROL DOES NOT OPERATE (M978) (CONT}.

Step 5. Check for defective throttle control wiring. Remove main junction box cover (para 7-47),

Check resistance of green wire between control junction box terminal board terminal No. 2

and main junction box terminal board terminal No. 2. Refer to FO-1, Electric Diagram,

sheets 4 and 5.

If resistance is zero ohms, go to Step 6,

If resistance is more than zero ohms, repair or replace wire (pm-as 7-49 or 7-47).

Step 6. Check for defective tanker wiring. Disconnect main power connector. Check resistance of

green wire between main junction box terminal board No. 2 and connector pin No. 2. Refer

to FO-1, EIectric Diagram, sheets 4 and 5, wire No. 516.

If resistance is zero ohms, go to Step 7.

If resistance is more than zero ohms, repair or replace green wire (para 7-47).

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