LOW AIR WARNING LIGHT AND BUZZER NOT OPERATING PROPERLY

TM 9-2320-285-24-1

2-19.

INSTRUMENT PANEL TROUBLESHOOTING (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

3. OIL PRESSURE WARNING LIGHT OR BELL NOT OPERATING PROPERLY (Cont)

Step 4.

Check continuity of diodes (para 2-35f) and brown/red electrical lead connecting diodes and bell.

a. If continuity is not obtained, replace diodes (para 2-35f) or repair wiring (para 2-35c(2)).

b. If continuity is obtained, go to step 5 below.

Step 5.

Check continuity of wiring connecting diodes and oil pressure sensor.

a. If continuity is not obtained, repair or replace wiring (para-2-32a).

b. If continuity is obtained, replace water temperature sensor (para 2-32a).

4. LOW AIR WARNING LIGHT AND BUZZER NOT OPERATING PROPERLY

Step 1.

Turn key switch to on position.

Relieve air system of all pressure (para 2-41h(1)).

LOW AIR warning lamp and low air pressure buzzer should be on.

a. If lamp does not light and buzzer sounds, go to step 3 below.

b. If lamp lights and buzzer does not sound, go to step 4 below.

c. If lamp does not light and buzzer does not sound, go to step 5 below.

d. If lamp lights and buzzer sounds, go to step 2 below.

Step 2.

Start engine.

Allow air system pressure to build to 76 psi.

Watch LOW AIR warning light and listen to low air pressure buzzer.

LOW AIR warning lamp should extinguish and buzzer should stop sounding

when

air

system

pressure reaches approximately 76 psi.

If lamp does not extinguish and buzzer does not stop sounding at approximately 76 psi,

troubleshoot air system (para 2-47 or 2-48).

b. If lamp does not extinguish and buzzer does not stop sounding when air system pressure is well

above 76 psi, go to step 5 below.

2-175