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TM 10-3930-643-20
ELECTRICAL SYSTEM TROUBLESHOOTING AND MAINTENANCE.
5-8.
Instrument Panel Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
q .
ENGINE OIL PRESSURE GAGE DOES NOT OPERATE.
Step 3.
Connect instrument gage tester. Use instructions provided with
gage tester. Test values for engine oil pressure gage should
read: Run (green) zone, Low 12 psi, Hight 75 psi. Resistance
(ohms), Low 182, High 42. System voltage, 24V.
Step 4.
Test the continuity of the wire assembly. Disconnect Terminal
A from engine oil pressure gage, as shown. Disconnect
instrument panel harness from intermediate harness, as shown.
Connect multimeter to Terminal A and Pin B.
If the multimeter needle does not move, the circuit does not have
c o n t i n u i t y.
I d e n t i f y a s a d e f e c t i v e w i r e a n d c o n t a c t D i r e ct
Support.
Step 5.
T e s t t h e c o n t i n u i t y o f t h e o i l p r e s s u r e s e n d e r . C o n n e ct
multimeter to terminal at the top of sender and to ground.
If the multimeter needle does not move, the circuit does not have
continuity. Replace oil pressure sender, refer to paragraph 5-40.
5-67
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