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 200 of 288

TM 9-2540-207-14&P

6-36

EXHAUST TEMPERATURE HAS EXCEEDED A SAFE OPERATING TEMPERATURE

CHECK/POSSIBLE CAUSE

REF

.R

EPAIR

7

CHECK FOR LOOSE CONNECTIONS

BETWEEN THE VENT FAN BOARD

AND THE LOGIC BOARD

RECONNECT THE P11 PLUG INTO THE VENT

FAN BOARD AND THE P1 PLUG INTO THE

LOGIC BOARD

RESTART HEATER

8

CHECK WIRE HARNESS FOR

CONTINUITY AND SHORTS

CHECK 2 WIRES FROM THE VENT FAN

BOARD TO THE LOGIC BOARD FOR

CONTINUITY AND SHORT TO GROUND:

P11-PIN12 TO P1-PIN3

P11-PIN4 TO P1-PIN12

CHECK

FOR MV SIGNAL

BETWEEN

P11-PIN13 AND P11-PIN5 FOR BT SENSOR

P11-PIN14 AND P11-PI N 6 FOR XT SENSOR

CHECK FOR OPEN LINE BETWEEN

P11-PIN13 TO CHASIS GROUND AND

P11-PIN14 TO CHASIS GROUND

IF ANY CHECK FAILS

REPLACE WIRE HARNESS

RESTART HEATER

9

DEFECTIVE

VENT FAN BOARD

REPLACE VENT FAN BOARD

RESTART HEATER

10

DEFECTIVE LOGIC BOARD FOR

REPLACE LOGIC BOARD

RESTART HEATER