Is the voltage greater than 10 volts?
K19 CHECK CIRCUIT 347 (BK/YE)
Measure the resistance between the A/C control relay socket pin 5, circuit 347 (BK/YE) and the
A/C compressor clutch field coil C100, circuit 347 (BK/YE).
Is the resistance less than 5 ohms?
Yes
GO to K21.
No
REPAIR circuit 347 (BK/YE). TEST the system for normal operation.
K20 CHECK THE A/C COMPRESSOR CLUTCH AIR GAP
Measure the A/C compressor clutch air gap at three equally spaced locations between the clutch
hub and the A/C compressor clutch pulley.
Is the A/C compressor clutch air gap greater than 0.75 mm (0.030 in)?
Yes
ADJUST the A/C compressor clutch field coil. REFER to Air Conditioning
(A/C) Clutch Air Gap Adjustment in this section. TEST the system for
normal operation.
No
INSTALL a new A/C compressor clutch field coil. REFER to Section 412-
03. TEST the system for normal operation.
K21 CHECK THE WAC OUTPUT FROM THE PCM
Ignition ON.
With the engine running, measure the resistance between the A/C control relay socket pin 2,
circuit 331 (PK/YE) and ground.
Is the resistance less than 5 ohms?
Yes
INSTALL a new A/C control relay. CLEAR the DTCs. TEST the system
for normal operation.
No
GO to K22.
K22 CHECK CIRCUIT 331 (PK/YE)
Ignition OFF.
Disconnect: PCM C175.
Measure the resistance between the A/C control relay socket pin 2, circuit 331 (PK/YE) and the
PCM C175 pin 69 circuit 331 (PK/YE).
Is the resistance less than 5 ohms?
Yes
INSTALL a new PCM. REFER to Section 303-14. TEST the system for
normal operation.
No
REPAIR circuit 331 (PK/YE). CLEAR the DTCs. TEST the system for
normal operation.
2003 Taurus/Sable Workshop Manual
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS3H/~MUS~LEN/19/
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