PINPOINT TEST L: THE A/C IS ALWAYS ON
Test Step Result / Action to Take
L1 CHECK PID WACF WITH THE A/C OFF
Ignition ON.
Place the function selector switch to the OFF position or press the OFF manual override
button .
Enter the following diagnostic mode on the scan tool: PCM PID WACF.
Does the PCM PID WACF read YES?
Yes
REPAIR circuit 331 (PK/YE). TEST the system for normal operation.
No
GO to L2.
L2 CHECK PID ACCS WITH THE A/C OFF
Enter the following diagnostic mode on the scan tool: PCM PID ACCS.
Does the PCM PID ACCS read ON?
Yes
GO to L3.
No
GO to L7.
L3 CHECK FOR VOLTAGE AT THE LOW CHARGE SWITCH
Ignition OFF.
Disconnect: Low Charge Switch C130.
Ignition ON.
Measure the voltage between the low charge switch C130 pin 1, circuit 348 (VT) and
ground.
Is the voltage greater than 10 volts?
Yes
GO to L4.
No
GO to L5.
L4 CHECK CIRCUIT 348 (VT)
Ignition OFF.
Remove the climate control assembly. Refer to Section 412-04.
Disconnect: Function Selector Switch C294b or RCC module C228.
Ignition ON.
Measure the voltage between the low charge switch C130 pin 1, circuit 348 (VT) and
ground.
Is the voltage greater than 10 volts?
Yes
REPAIR circuit 348 (VT) for a short to voltage. TEST the system for normal
operation.
No
INSTALL a new function selector switch. REFER to Section 412-04. TEST the
system for normal operation.
L5 CHECK CIRCUIT 441 (RD/YE)
Ignition OFF.
Disconnect: A/C Pressure Cutoff Switch C1062.
Ignition ON.
Measure the voltage between the A/C pressure cutoff switch C1062 pin 4, circuit 441
(RD/YE) and ground.
Is the voltage greater than 10 volts?
Yes
REPAIR circuit 441 (RD/YE). TEST the system for normal operation.
No
GO to L6.
L6 CHECK CIRCUIT 879 (DG/WH)
Measure the voltage between the A/C pressure cutoff switch C1062 pin 1, circuit 879
(DG/WH) and ground.
Yes
REPAIR circuit 879 (DG/WH) for a short voltage. TEST the system for normal
operation.
No
INSTALL a new PCM. REFER to Section 303-14. 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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