Ford Taurus 2003 - Page 30

 Start the engine.
 Does the A/C compressor operate?
K15 CHECK CIRCUIT 879 (DG/WH)
 Ignition OFF.
 Remove the fused jumper lead from the A/C pressure cutoff switch C1062.
 Disconnect: PCM C175.
 Measure the resistance between the A/C pressure cutoff switch C1062 pin 1, circuit 879 (DG/WH)
and the PCM C175 pin 41, circuit 879 (DG/WH).
 Is the resistance less than 5 ohms?
Yes
INSTALL a new PCM. REFER to Section 303-14.
No
REPAIR circuit 879 (DG/WH). TEST the system for normal operation.
K16 CHECK THE VOLTAGE AT THE A/C COMPRESSOR CLUTCH FIELD COIL
 Ignition OFF.
 Disconnect: A/C Compressor Clutch Field Coil C100.
 Ignition ON.
 Measure the voltage between the A/C compressor clutch field coil C100, circuit 347 (BK/YE) and
ground.
 Is the voltage greater than 10 volts?
Yes
GO to K17.
No
GO to K18.
K17 CHECK THE GROUND AT THE A/C COMPRESSOR CLUTCH FIELD COIL
 Ignition OFF.
 Measure the resistance between the A/C compressor clutch field coil C100, circuit 57 (BK) and
ground.
 Is the resistance less than 5 ohms?
Yes
GO to K20.
No
REPAIR circuit 57 (BK). TEST the system for normal operation.
K18 CHECK CIRCUIT 883 (PK/LB)
 Ignition OFF.
 Disconnect: A/C Control Relay.
 Measure the voltage between the A/C control relay socket pin 3, circuit 883 (PK/LB) and ground.
Yes
GO to K19.
No
REPAIR circuit 883 (PK/LB). TEST the system for normal operation.
Page
30
of
47
2003 Taurus/Sable Workshop Manual
11/22/2011
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS3H/~MUS~LEN/19/
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