TM-9-2540-207-14-P

HEATER, VEHICULAR COMPARTMENT, MODEL: A20

TECHNICAL MANUAL; OPERATOR, FIELD, AND SUSTAINMENT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST

JULY 2007

TM-9-2540-207-14-P - Page 181 of 288

TM 9-2540-207-14&P

6-17

VOLTAGE SUPPLIED TO THE HEATER IS BELOW NORMAL VOLTAGE LIMITS (19VDC-28VDC

NORMAL RANGE); LOW VOLTAGE OR LOW VOLTAGE IN VENT ONLY

CHECK/POSSIBLE CAUSE

REF

.R

EPAIR

7

CHECK VOLTAGE AT THE POWER

BOARD TO LOGIC BOARD

INTERFACE

VOLTAGE BETWEEN GROUND (J9-PIN1) AND HOT

WIRE (J2-PIN6) SHOULD EQUAL THE VOLTAGE

SUPPLIED

IF THE VOLTAGE IS LOW

REPLACE THE POWER BOARD

RESTART HEATER

8

DEFECTIVE LOGIC BOARD

REPLACE LOGIC BOARD

RESTART HEATER

6.5.23 E2 - LOW FUEL PRESSURE (Design Iteration 1 & 2 Only)

FUEL SUPPLY PRESSURE TO THE HEATER IS BELOW 3PSI

CHECK/POSSIBLE CAUSE

REF

.R

EPAIR

1

CHECK THAT VEHICLE OR SOURCE

FUEL PUMP IS OPERATING

2.6

RECONNECT SOURCE FUEL PUMP

RESTART HEATER

2

CHECK IF VEHICLE FUEL FILTER IS

PLUGGED

REPLACE FUEL FILTER

RESTART HEATER

3

CHECK FOR AIR BUBBLES IN THE

FUEL LINE.

BLEED AIR FROM FUEL LINES.

4

CHECK TO SEE IF FUEL LINE

LEADING TO HEATER IS PINCHED

OR OBSTRUCTED

STRAIGHTEN FUEL LINES AND REMOVE

OBSTRUCTIONS

RESTART HEATER

5

CHECK THAT THERE IS AMPLE FUEL

SUPPLY

TABLE 2-1

FILL FUEL TANK WITH FUEL

RESTART HEATER

6

ENSURE THAT FUEL PRESSURE

SENSOR IS CONNECTED TO

WIRING HARNESS

5.5.1

RECONNECT FUEL PRESSURE SENSOR TO

WIRING HARNESS

RESTART HEATER

7

DEFECTIVE FUEL PRESSURE

SENSOR

5.5.1

REPLACE FUEL PRESSURE SENSOR

RESTART HEATER

8

DEFECTIVE WIRING HARNESS

5.5.6

REPLACE WIRING HARNESS

RESTART HEATER