TM-9-2320-283-20-1

TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1

TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3

DECEMBER 1983

TM-9-2320-283-20-1 - Page 205 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

INSTRUCTION

INDICATION

YES

NO

28.

LOW AIR PRESSURE INDICATOR AND/OR BUZZER NOT WORKING.

1.

Remove circuit breaker

bracket far enough to

access circuit breaker

CB-2 (para 3-114), and

go to step 2.

NOTE

Ignition switch must be in ON position and battery power connected when doing the following checks.

2

Check for voltage at

12-volts dc

Go to step 3

Reset circuit

circuit 44E-LB ter-

nominal

breaker CB-2

minal of circuit

and/or trouble-

breaker CB-2

shoot CB-2 cir-

cuit (Refer

to malfunction

33).

3

Check for voltage at

12-volts dc

Go to step 4

Repair circuit

circuit 44E-LB ter-

nominal

44E-LB (para

minal of low air

3-127).

pressure switch.

NOTE

When doing the following checks, make sure vehicle system air pressure is below 60 psi.

4

Check for voltage at

12-volts dc

Go to step 5

Replace switch

circuit 53A-DB ter-

nominal

(para 3-109).

minal of low air

pressure switch.

NOTE

If buzzer is operating properly, but indicator lamp will not light, proceed to step 8.

Otherwise, begin with step 5.

2-80