Ford 2003 Mustang Workshop Manual page 3065

tool:
Monitor the PCM PID WACF while turning the function
selector.
Does the PCM PID WACF read YES?
C3 CHECK THE PCM PID ACCS WITH THE A/C ON
Key in START position.
Make sure the engine is at idle.
Enter the following diagnostic mode on the diagnostic
tool: PCM PID ACCS.
Monitor the PCM PID ACCS while turning the function
selector.
Does the PCM PID ACCS read ON?
C4 CHECK PCM PID WAC WITH THE A/C ON
NOTE: When PCM PID WACF is YES, this is the same
fault as DTC P1460.
Enter the following diagnostic mode on the diagnostic
tool: PCM PID WAC.
Monitor the PCM PID WAC while turning the function
selector.
Does the PCM PID WAC read ON?
C5 CHECK THE INPUT SIGNAL TO THE PCM
Key in OFF position.
Disconnect: PCM C175.
Key in ON position.
Measure the voltage at PCM C175-41, circuit 198
(DG/OG), harness side and ground.
Is the voltage reading greater than 10 volts?
C6 CHECK THE REFRIGERANT PRESSURE
Key in OFF position.
Connect the manifold gauge set. Refer to
System Tests in this section.
Is the system pressure 345-1,724kPa (50-250psi)?
C7 CHECK THE SUPPLY TO THE FUNCTION SELECTOR
SWITCH
Key in OFF position.
Disconnect: Function Selector Switch C294c.
Key in ON position.
Measure the voltage at the function selector switch
C294c-2, circuit 883 (PK/LB), harness side and ground.
Control/Emissions Diagnosis
(PC/ED) manual.
No
GO to
Yes
GO to
No
GO to
Yes
GO to
No
GO to
Yes
INSTALL a new powertrain
control module. TEST the
system for normal operation.
No
GO to
Yes
GO to
Refrigerant
No
REPAIR the leaks and
RETEST the system for normal
operation. REFER to
412-03
Yes
GO to
No
GO to
C3 .
C4 .
C6 .
C20 .
C5 .
C6 .
C7 .
Section
.
C17 .
C8 .