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 175 of 288
TM 9-2540-207-14&P
6-11
6.5.11 C6 - VENT SENSOR FAULT(Design Iteration 1 & 2 Only)
VENT SENSOR HAS FAILED
CHECK/POSSIBLE CAUSE
REF
.R
EPAIR
1
CHECK THAT VENT SENSOR IS CONNECTED
TO THE WIRING HARNESS
.INSPECT WIRES
AT CONNECTOR AND VENT SENSOR.
5.4.2
RECONNECT VENT SENSOR TO WIRING HARNESS
RESTART HEATER
2
DEFECTIVE VENT SENSOR
5.4.2
REPLACE VENT SENSOR
RESTART HEATER
3
DEFECTIVE WIRING HARNESS
5.5.6
REPLACE WIRING HARNESS
RESTART HEATER
4
DEFECTIVE ELECTRONIC PROGRAMMED
CONTROLLER BOARD
5.2.5
REPLACE ELECTRONIC CONTROLLER BOARD
RESTART HEATER
6.5.12 C6 - VENT SENSOR FAULT (Design Iteration 3 Only)
VENT SENSOR IS OUTSIDE NORMAL LIMITS; VENT RING SHORT, OPEN AND GROUNDED
CHECK/POSSIBLE CAUSE
REF
.R
EPAIR
1
CHECK THAT VENT SENSOR IS CONNECTED
TO THE WIRING HARNESS.
5.4.2
RECONNECT VENT SENSOR TO WIRING HARNESS AND GROUND
WIRE ATTACHED TO BURNER HOUSING
RESTART HEATER
2
CHECK FOR DAMAGED WIRE FROM VENT
SENSOR TO HARNESS PLUG
R
EPLACE VENT SENSOR
RESTART HEATER
3
CHECK WIRES FROM PLUG P10 TO VENT FAN
BOARD (PLUG P11) FOR DAMAGE
CHECK 2 WIRES FROM VENT SENSOR P10 TO VENT FAN BOARD P11
FOR CONTINUITY; P10-PIN A TO P11-PIN11 P10-PIN B TO P11-PIN3
4
CHECK J13 CONNECTOR SOLDER JOINTS
ON THE VENT FAN BOARD FOR SHORT AND
LOOSE JOINT
R
EPLACE VENT FAN BOARD
RESTART HEATER
5
CHECK WIRE HARNESS FOR CONTINUITY AND
SHORTS
C
HECK 2 WIRES FROM THE VENT FAN BOARD TO THE LOGIC BOARD
FOR CONTINUITY:
P11-PIN12 TO P1-PIN3
P11-PIN4 TO P1-PIN12
CHECK FOR
SHORT TO GROUND
P1-PIN3 TO CHASSIS SHOULD BE OPEN LINE
P1-PIN12 TO CHASSIS SHOULD BE OPEN LINE
IF ANY CHECK FAILS
REPLACE WIRE HARNESS
RESTART HEATER
6
CHECK J8 CONNECTOR SOLDER JOINTS ON
THE LOGIC BOARD FOR SHORT AND LOOSE
JOINTS
R
EPLACE LOGIC BOARD
RESTART HEATER
7
DEFECTIVE VENT SENSOR RING
5.4.2
REPLACE VENT SENSOR RING
RESTART HEATER
8
DEFECTIVE VENT FAN BOARD
R
EPLACE VENT FAN BOARD
RESTART HEATER
9
DEFECTIVE LOGIC BOARD
R
EPLACE LOGIC BOARD
RESTART HEATER
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