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TM 55-4920-412-13&P
g. Engine Oil Temp NO 1 and NO 2.
(1)
Connect Digital multimeter to connector NO 1
pin g (HI)and h (LOW), using two leads.
(2)
Set ENGINE OIL TEMP NO 1 CAL/NOR switch
to CAL, HI/LO switch to HI and variable control fully CW.
NOTE
Measure resistance of test leads and
subtract from resistance indications
(3)
Measure resistance. Digital multimeter will
indicate between 150.2 and 151.0 ohms. If not, perform
Troubleshooting Table 4-10.
(4)
Set ENGINE OIL TEMP NO 1 HI/LO switch to
LO. Digital multimeter will indicate between 75.3 and
75.9 ohms. If not, perform Troubleshooting Table 4-10.
(5)
Set ENGINE OIL TEMP NO 1 CAL/NOR switch
to NOR. Digital multimeter shall indicate between 170
and 190 ohms plus calibrated resistance.
(6)
Adjust variable control from fully CW to fully
CCW. Digital multimeter will indicate between 73.6 and
77.6 ohms. If not, perform Troubleshooting Table 4-10.
(7)
Disconnect leads from connector NO 1 pins g
(HI) and h (LOW) and connect to connector NO 2 pins g
(HI) and h (LOW).
(8)
Repeat (2) through (6) above, except use
ENGINE OIL TEMP NO 2 controls.
Table 4-10. Troubleshooting Engine Oil Temp NO 1 or NO 2 (AVIM)
NOTE
Before performing troubleshooting, remove DC simulator A4 board and reconnect
using extender board.
Trouble
Probable Cause
Remedy
No HI-CAL resistance
Eng Oil Temp NO 1
Replace defective components,
(S20) (S21) (R41)
Figures 4-6, 4-7, FO-2, FO-5 or replace
Eng Oil Temp NO 2
A4 board.
(S22) (S23) (R38)
HI-CAL Resistance
Trim resistors
Use decade resistor box, and check or
Indication out of tolerance
NO 1 - (R42)
replace defective components,
NO 2 - (R39)
Figures 4-6, 4-7, FO-2, FO-5 or replace
A4 board.
HI-CAL resistance
NO 1 - (R41) (R43)
Replace defective components,
Indication out of tolerance
(S20) or (S21)
Figures 4-6, 4-7, FO-2, FO-5 or replace
resistors checked or replaced (R42) or
NO 2 - (R38) (R40)
A4 board.
(R39)
(S22) (S23)
LO-CAL resistance
NO 1 - (S20)
Replace defective components,
Indication out of tolerance
NO 2 - (S22)
Figures 4-6, 4-7, FO-2, FO-5 or replace
A4 board.
NOR-FULLY CCW
NO 1 - (R9)
Replace defective components,
Resistance out of tolerance
NO 2 - (R10)
Figures 4-6, 4-7, FO-2, FO-5 or replace
A4 board.
NOR-FULLY CW
NO 1 - (R9)
Replace defective components,
Resistance out of tolerance
NO 2 - (R10)
Figures 4-6, 4-7, FO-2, FO-5 or replace
A4 board.
NOTE
Not all components listed for circuits above are indicated in Table. Refer to
applicable circuits and Troubleshoot using information provided in Table.
NOTE
Resistance checks are also listed on figure 4-7.
Change 2 4-15
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