Ford F-150 1999 Workshop Manual page 15

1999 F-150/250 Workshop Manual
C11 CHECK CIRCUIT 348 (VT)
Function Selector Switch C217
C12 CHECK CIRCUIT 295 (LB/PK)
C13 CHECK THE VOLTAGE AT THE A/C COMPRESSOR CLUTCH FIELD COIL
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Is the resistance reading greater than 10,000 ohms?
Yes
INSTALL a new A/C pressure cutoff switch. TEST the system for normal operation.
No
REPAIR Circuit 441 (RD/YE). TEST the system for normal operation.
Measure the resistance between the A/C pressure cutoff switch C170 pin 3, circuit 348 (VT) and the function
selector switch C217 pin 2, circuit 348 (VT).
Is the resistance less than 5 ohms?
Yes
GO to C12.
No
REPAIR circuit 348 (VT). TEST the system for normal operation.
Measure the voltage between the function selector switch C217 pin 1, circuit 295 (LB/PK) and ground.
Is the voltage greater than 10 volts?
Yes
INSTALL a new function selector switch. TEST the system for normal operation.
No
REPAIR circuit 295 (LB/PK). TEST the system for normal operation.
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8/16/2010