TM 10-4320-315-24
Table 2-2. Troubleshooting Procedures - (Cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4.
ENGINE SMOKES.
Step 1.
Check cylinder head valve adjustment.
Adjust valves (para. 2-55)
Step 2.
Check fuel return lines for blockage.
Remove blockage. If malfunction still exists, refer to direct support maintenance.
56. IMPROPER GOVERNOR SYSTEM OPERATION.
NOTE
Refer to electrical wiring diagrams of control panel (Figure 2-1) and engine wiring harness
(Figure 2-2) when making voltage and resistance checks.
Step 1.
Check and see if actuator linkage is stuck, loose or out of adjustment.
As necessary, adjust actuator linkage.
Step 2.
Check adjustment of MPU (para. 2-36).
As necessary, adjust MPU (para. 2-36).
Step 3.
Using multimeter check for MPU signal at input cable of governor control module (pins K and J).
Replace MPU if signal is absent. Signal is a small AC voltage.
Step 4.
Disconnect cable from governor control module and measure resistance between pins C and H on
cable while turning AUTO THROTTLE rheostat through its full range.
Replace AUTO THROTTLE (ASA) if resistance is not variable throughout the full range of
AUTO THROTTLE (ASA) (para. 2-25).
Step 5.
Check THROTTLE SELECT (ASS) switch for open/shorted contacts.
Replace switch if defective (para. 2-24).
Step 6.
Check AUTO SELECT PRESSURE/SPEED switch (TSS) selector for open/shorted contacts.
Replace switch if defective (para. 2-24).
2-19
