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/...
