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TM 10-4320-343-14
Table 4-2.1. Unit Troubleshooting Table (Model 350 PAFN). (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
a. Remove cover from control box (paragraph 4.14.4) and connect a jumper between the two test
points on control box. Press in on the OIL PRESSURE BYPASS switch, while noting that actuator
turns the fuel control lever on the engine to the full "fuel open" position.
b. Remove control box from actuator (paragraph 4.14.4) and check for resistance between pins A and
C on actuator, looking for a value of 25 - 30 Ohms and from pins A to B, looking for continuity. Replace
actuator (paragraph 4-14.5) if actuator does not move and/or required resistance values are not
indicated.
Step 11
Test magnetic pickup (item 3, Figure 4-54) by connecting a multimeter, set up to measure a voltage of 0
to 50 Vac, and connect to pins on magnetic pickup, while cranking the engine.
Adjust or replace pickup (paragraph 4.14.3) if a voltage of less than 2 Vac is indicated.
Step 12
Test resistance across potentiometer in pressure controller (Figure 4-53) by measuring from pin B to C
on right hand connector of pressure controller, looking for a value of 4 to 6 Ohms, and from pin E of the
same connector to the wiper contact (green wire) of the mode switch in the pressure controller. Check
for continuity (zero Ohms).
Replace pressure controller (paragraph 4.14.2) if correct values are not indicated.
Step 13
Open cover (item 6, Figure 4-53) on pressure controller and, while pressing the OIL PRESSURE
BYPASS switch check voltages from white wire on potentiometer (manual speed control) to ground,
checking for 4 Vdc and on black wire to ground looking for 8 Vdc.
If voltages are not indicated, replace pressure controller (paragraph 4.14.2).
Step 14
Check for voltages at wiper contact (green wire) of mode switch in pressure controller (Figure 4-53)
while cranking engine. Look for a voltage of 3 to 4 Vdc.
If voltage is not indicated, replace pressure controller (paragraph 4.14.2)
If voltage is indicated, replace control box (paragraph 4.14.4).
Step 15
Remove and weigh starting fluid can (item 1, Figure 4-7.1) to determine serviceability (paragraph
4.10.4.1.1.).
Replace can if level is inadequate (paragraph 4.10.4.1).
Step 16
Check for clogged starting fluid tubing (item 4, Figure 4-7.1) and nozzle (item 2, Figure 4-7.3).
Remove clog and/or replace tubing (paragraph 4.10.4.1) and nozzle (paragraph 4.10.4.3).
Step 17
Test system wiring (paragraph 4.12.4.1) for continuity and shorts.
Replace system harness (paragraph 4.12.4.1) or individual wires as appropriate.
Step 18
Check continuity through starting aid temperature switch (Figure 4-7.2).
a. Replace switch (paragraph 4.10.4.2) if defective.
b. Replace cold start solenoid (paragraph 4.10.5.1) if switch is good.
4-10.4 Change 1
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