Test Step
Result / Action to Take
K1 CHECK THE A/C PRESSURE PCM PID
Ignition ON.
Enter the following diagnostic mode on the scan tool: A/C Pressure PCM PID.
With the manifold gauge set connected, compare the pressure readings of the manifold gauge set
and the A/C pressure PID.
Are the pressure values of the manifold gauge set and the A/C pressure PID similar?
Yes
GO to
K2
.
No
INSTALL a new A/C pressure transducer. TEST the system for normal
operation.
K2 CHECK THE A/C EVAPORATOR TEMPERATURE PID
Allow the vehicle exterior and interior to stabilize to an ambient temperature above 16°C (60°F).
Enter the following diagnostic mode on the scan tool: A/C Evaporator Discharge Temperature
PCM PID.
Does the A/C evaporator discharge temperature PID read similar to the ambient
temperature?
Yes
GO to
K3
.
No
INSTALL a new A/C evaporator discharge temperature sensor. TEST the
system for normal operation.
K3 CHECK PID ACCS WITH THE A/C OFF
Ignition ON.
With the engine running, place the function selector switch to the OFF position or press the OFF
manual override button on the remote climate control (RCC) module.
Enter the following diagnostic mode on the scan tool: PCM PID ACCS.
Does the PCM PID ACCS read ON?
Yes
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
No
GO to
K4
.
K4 CHECK PID WAC WITH THE A/C OFF
Enter the following diagnostic mode on the scan tool: PCM PID WAC.
Does the PCM PID WAC read ON?
Yes
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
No
GO to
K5
.
K5 CHECK THE PID ACCS WITH THE A/C ON
Enter the following diagnostic mode on the scan tool: PCM PID ACCS.
Place the function selector switch in the MAX A/C position.
Does the PCM PID ACCS read ON?
Yes
GO to
K6
.
No
GO to
K7
.
K6 CHECK THE PID WAC WITH THE A/C ON
Enter the following diagnostic mode on the scan tool: PCM PID WAC.
Does the PCM PID WAC read ON?
Yes
GO to
K16
.
No
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
K7 CHECK THE A/C PRESSURE CUTOFF SWITCH VOLTAGE
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
GO to
K14
.
No
GO to
K8
.
K8 CHECK THE LOW CHARGE SWITCH VOLTAGE
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
K9
.
No
Vehicles with manual climate control, GO to
K10
. Vehicles with EATC,
GO to
K12
.
K9 CHECK THE LOW CHARGE SWITCH
Ignition OFF.
Measure the resistance between the low charge switch terminals.
Yes
REPAIR circuit 441 (RD/YE). TEST the system for normal operation.
No
GO to
K13
.
Page 28 of 47
2003 Taurus/Sable Workshop Manual
11/22/2011
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS3H/~MUS~LEN/19/...
