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 178 of 288

TM 9-2540-207-14&P

6-14

6.5.17 C9 - FUEL PUMP FAULT (Design Iteration 1 & 2 Only)

OPERATING PARAMETERS FOR THE FUEL PUMP ARE OUTSIDE NORMAL LIMITS

CHECK/POSSIBLE CAUSE

REF

.R

EPAIR

1

CHECK THAT ELECTRICAL CONNECTOR

IS ATTACHED TO FUEL PUMP

5.5.3

RECONNECT FUEL PUMP TO WIRING HARNESS

RESTART HEATER

2

DEFECTIVE FUEL PUMP

5.5.3

REPLACE FUEL PUMP

RESTART HEATER

3

DEFECTIVE ELECTRONIC PROGRAMMED

CONTROLLER BOARD

5.2.5

REPLACE ELECTRONIC PROGRAMMED CONTROLLER

RESTART HEATER

4

DEFECTIVE WIRING HARNESS

5.5.6

REPLACE WIRING HARNESS

RESTART HEATER

NOTE:THE HEATER DOES NOT SHUT DOWN WHEN A C9 FAULT IS ENCOUNTERED, BUT WILL

CONTINUE TO OPERATE AT REDUCED PERFORMANCE.

6.5.18 C9 - FUEL PUMP FAULT (Design Iteration 3 Only)

OPERATING PARAMETERS FOR THE FUEL PUMP ARE OUTSIDE NORMAL LIMITS; FUEL PUMP OPEN

CHECK/POSSIBLE CAUSE

REF

.R

EPAIR

1

CHECK THAT ELECTRICAL CONNECTOR

IS ATTACHED TO FUEL PUMP AND

HARNESS TO POWER BOARD

5.5.3

RECONNECT FUEL PUMP TO WIRING HARNESS

RECONNECT PLUG P8 INTO POWER BOARD

RESTART HEATER

2

CHECK FUEL PUMP RESISTANCE

RESISTANCE SHOULD BE 7 TO 8 OHMS

IF RESISTANCE IS HIGH OR AN OPEN LINE

REPLACE FUEL PUMP

RESTART HEATER

3

CHECK

WIRING HARNESS FOR DAMAGE

AND CONTINUITY

CHECK 2 WIRES FROM

PLUG P7 TO POWER BOARD

PLUG P8:

P7-PIN A TO P8-PIN2

P7-PIN B TO P8-PIN1

IF ANY CHECK FAILS

REPLACE WIRING HARNESS

RESTART HEATER

4

DEFECTIVE POWER BOARD

REPLACE POWER BOARD

RESTART HEATER

5

DEFECTIVE LOGIC BOARD

REPLACE LOGIC BOARD

RESTART HEATER

NOTE: THE HEATER DOES NOT SHUT DOWN WHEN A C9 FAULT IS ENCOUNTERED, BUT WILL CONTINUE

TO OPERATE AT REDUCED PERFORMANCE.