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 176 of 288
TM 9-2540-207-14&P
6-12
6.5.13
C7 - FUEL PRESSURE SENSOR FAULT (Design Iteration 1 & 2 Only)
FUEL PRESSURE SENSOR HAS FAILED
CHECK/POSSIBLE CAUSE
REF.
REPAIR
1
CHECK THAT ELECTRICAL
CONNECTOR IS ATTACHED TO FUEL
PRESSURE SENSOR
5.5.1
RECONNECT FUEL PRESSURE SENSOR TO
WIRING HARNESS
RESTART HEATER
2
DEFECTIVE FUEL PRESSURE
SENSOR
5.5.1
REPLACE FUEL PRESSURE SENSOR
RESTART HEATER
3
DEFECTIVE ELECTRONIC
PROGRAMMED CONTROLLER
BOARD
5.2.5
REPLACE PROGRAMMED CONTROLLER
RESTART HEATER
4
DEFECTIVE WIRING HARNESS
5.5.6
REPLACE WIRING HARNESS
RESTART HEATER
NOTE
:IF A C7 FAULT OCCURS DURING RUN MODE (07 OR 14), THE HEATER WILL CONTINUE TO
OPERATE AT REDUCED TEMPERATURE IF POSSIBLE, AND ALTERNATELY DISPLAY THE C7 CODE AND
THE APPROPRIATE RUN MODE (07 OR 14)
6.5.14 C7 - FUEL PRESSURE SENSOR FAULT (Design Iteration 3 Only)
FUEL PRESSURE SENSOR SIGNAL IS OUTSIDE NORMAL LIMITS; FUEL PRESSURE OVER 20
PSI, OR OPEN CIRCUIT
CHECK/POSSIBLE CAUSE
REF.
REPAIR
1
CHECK FUEL PRESSURE SUPPLY
TO THE HEATER IS BETWEEN 3 TO
15 PSI
REDUCE FUEL SUPPLY PRESSURE
RESTART HEATER
2
CHECK THAT ELECTRICAL
CONNECTOR IS ATTACHED TO FUEL
PRESSURE SENSOR
5.5.1
RECONNECT FUEL PRESSURE SENSOR TO
WIRING HARNESS
RESTART HEATER
3
CHECK WIRING HARNESS FOR
CONTINUITY
5.5.6
CHECK 3 WIRES FROM TRANSDUCER PLUG
P4 TO LOGIC BOARD PLUG P1;
P4-PIN A TO P1-PIN17
P4-PIN B TO P1-PIN15
P4-PIN C TO P1-PIN16
IF ANY CHECK FAILS REPLACE WIRING
HARNESS
RESTART HEATER
4
DEFECTIVE FUEL PRESSURE
SENSOR
5.5.1
REPLACE FUEL PRESSURE SENSOR
RESTART HEATER
5
DEFECTIVE LOGIC BOARD
5.2.5
REPLACE LOGIC BOARD
RESTART HEATER
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