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Shawn
Shawn, Auto Service Technician
Category: Ford
Satisfied Customers: 3756
Experience:  16 years experience Ford,Nissan and Honda dealership in all areas
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Ford Contour high presure switch on a/c has no power to it

Resolved Question:

high presure switch on a/c has no power to it where does it get powerl 1999 ford contour se
Submitted: 3 years ago.
Category: Ford
Expert:  Shawn replied 3 years ago.
Hi,




Thank you for asking your question on JustAnswer. The other Experts and I are working on your answer. By the way, it would help us to know:



-What switch are you referring to?


-What else have you already tried?





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Customer: replied 3 years ago.
hi-pressure switch on the a/c the low pressure switch is ok, frion level is ok
Expert:  Shawn replied 3 years ago.
Where is the switch you are referring to located?
Customer: replied 3 years ago.
on the dicharge line next to the point where you attach hi pressure gage. there is a black and white wire on it , located front left side of the vehicle
Expert:  Shawn replied 3 years ago.

Hi,

 

 

 

 

Thank you for the reply. Just wanted to make sure you were not talking about the A/C cycling switch.

 

 

 

 

 

Thank you again for trusting us with your problem. Please reply as soon as possible so that we can finish answering your question.

Customer: replied 3 years ago.

can you help , thanks

Customer: replied 3 years ago.
my question wasnt anwered
Expert:  Shawn replied 3 years ago.
Hi,




Thank you for asking your question on JustAnswer.The function of the high pressure switch is to protect the high pressure section of the refrigerant circuit. When pressure exceeds the maximum value of 29,6 bar (2965 kPa, 430 psi) because, for instance, the air flow through the condenser is impeded or the high pressure line is blocked, the high pressure switch switches the compressor off.

Only when the pressure has fallen once more to 22,4 bar (2241 kPa, 325 psi) bar is the compressor switched on again. At a pressure level of 22,4 bar (2241 kPa, 325 psi) the PCM switches to high blower speed.

Only when the pressure has fallen once more to 17,2 bar (1717 kPa, 249 psi) does the PCM switch to low blower speed.






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Customer: replied 3 years ago.
ok doesnt that switch need to have power to it? , the a/c has not worked for about a month is that switch n/o or n/c
Expert:  Shawn replied 3 years ago.
-Does the compressor clutch engage?

-What problems are you having?
Customer: replied 3 years ago.
no ompressor will not engage
Expert:  Shawn replied 3 years ago.
-How much freon has been added?
Customer: replied 3 years ago.
none
Expert:  Shawn replied 3 years ago.
Hi,


Thank you for asking your question on JustAnswer. The most likely cause of the problem you are having is a defective A/C cycling switch, before replacing any parts I do recommend proper testing first, If you need I can send test procedures as well as replacement instructions.




Thank you again for trusting us with your problem. Please reply as soon as possible so that we can finish answering your question.
Customer: replied 3 years ago.
that would be very helpfull
Expert:  Shawn replied 3 years ago.

Thank you for the reply.

 

 

 


Please give me a few moments to upload that information for you (There is quite a bit). And Please don't forget to click on the green ACCEPT answer button, so that I may get credit for my work, thanks.

 


Thank you again for trusting us with your problem. Please reply as soon as possible so that we can finish answering your question.

Shawn, Auto Service Technician
Category: Ford
Satisfied Customers: 3756
Experience: 16 years experience Ford,Nissan and Honda dealership in all areas
Shawn and 7 other Ford Specialists are ready to help you
Customer: replied 3 years ago.

hope this works much thanks

Expert:  Shawn replied 3 years ago.
Hi,





Thank you for asking your question on JustAnswer. The test procedures are below.


A3 CHECK THE A/C CYCLING SWITCH


Disconnect A/C Cycling Switch C692



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Connect a fused jumper wire between A/C cycling switch C692, pin 4, circuit 14S-CA17 (VT/OG) and pin 1, circuit 14S-CA38 (VT).

  • Does the A/C clutch engage?
Yes
GO to A4.

No
GO to A5.
A4 CHECK THE REFRIGERANT SYSTEM PRESSURE


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Connect gauge set to port. High side reading must be above 169 kPa (50 psi).

  • Is the high side pressure above 169 kPa (50 psi)?
Yes
INSTALL a new A/C cycling switch. TEST the system for normal operation.

No
CHECK and REPAIR the refrigerant system for leaks or low charge or incorrect A/C compressor clutch air gap. TEST the system for normal operation.
A5 CHECK FOR VOLTAGE AT THE A/C CYCLING SWITCH - CIRCUIT 14S-CA17 (VT/OG)
NOTE: Verify the switch is in the MAX A/C position.

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Measure the voltage between A/C cycling switch C692, pin 4, circuit 14S-CA17 (VT/OG) and ground.

  • Is the voltage greater than 10 volts?
Yes
GO to A6.

No
GO to A20.
A6 CHECK FOR VOLTAGE TO THE DUAL PRESSURE SWITCH - CIRCUIT 15S-FA38 (GN/RD)
NOTE: If the pressure is decreasing the A/C compressor cycling switch will be opened and no voltage will be seen at the pressure switch. The pressure must be increasing to see any voltage at the pressure switch.
NOTE: Verify the switch is in the MAX A/C position and don't disconnect the jumper wire of C692.

Disconnect Dual Pressure Switch C882

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Measure the voltage between dual pressure switch C882, pin 2, circuit 15S-FA38 (GN/RD) and ground.

  • Is the voltage greater than 10 volts?
Yes
GO to A7.

No
REPAIR circuit 15S-FA38 (GN/RD). TEST the system for normal operation.
A7 CHECK THE DUAL PRESSURE SWITCH

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Measure the resistance, component side between the dual pressure switch terminals.

  • Is the resistance less than 5 ohms?
Yes
GO to A8.

No
INSTALL a new dual pressure switch. TEST the system for normal operation.
A8 CHECK CIRCUIT 15S-RE9 OR 15S-RE9A (GN/BU)



Connect Dual Pressure Switch C882


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Measure the voltage between the PCM, C421, pin 41, circuit 15S-RE9A (GN/BU) and ground.

  • Is the voltage greater than 10 volts?
Yes
GO to A9.

No
REPAIR circuit 15S-RE9 or 15S-RE9A (GN/BU). TEST the system for normal operation.
A9 CHECK THE A/C CYCLING SWITCH C692 FOR OPEN
Disconnect the jumper wiring of C692.


Connect A/C cycling switch C692

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Measure the voltage between the PCM, C421, pin 41, circuit 15S-RE9A (GN/BU) and ground.

  • Is the voltage greater than 10 volts?
Yes
GO to A10.

No
INSTALL a new A/C cycling switch. TEST the system for normal operation.
A10 CHECK CIRCUIT 15-FA12 (GN/BU) FOR VOLTAGE
NOTE: If the pressure is decreasing the A/C compressor cycling switch will be opened and no voltage will be seen at the A/C WOT relay. The pressure must be increasing to see any voltage at the WOT relay.

Disconnect A/C WOT Relay C465



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Measure the voltage between A/C WOT relay C465 pin 3, circuit 15-FA12 (GN/BU) and ground.

  • Is the voltage greater than 10 volts?
Yes
GO to A11.

No
REPAIR circuit 15-FA12. TEST the system for normal operation.
A11 CHECK CIRCUIT 15-FA11 (GN/YE) FOR OPEN - PCM CONNECTED
NOTE: If the pressure is decreasing the A/C compressor cycling switch will be opened and no voltage will be seen at the A/C WOT relay. The pressure must be increasing to see any voltage at the WOT relay.

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Connect a test light between A/C WOT relay C465, pin 1, circuit 15-FA11 (GN/YE) and A/C WOT relay C465, pin 2, circuit 91S-FA11 (BK/YE).

  • Is the test light illuminated?
Yes
GO to A14.

No
GO to A12.
A12 CHECK THE CIRCUIT 15-FA11 (GN/YE) FOR OPE

Measure the voltage between A/C WOT relay C465, pin 1, circuit 15-FA11 (GN/YE) and ground.

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  • Is voltage greater than 10 volts?
Yes
GO to A13.

No
REPAIR circuit 15-FA11. TEST the system for normal operation.
A13 CHECK THE CIRCUIT 91S-FA11 (BK/YE) FOR OPEN

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Measure the resistance between A/C WOT relay C465, pin 2 and PCM C421, pin 69, circuit 91S-FA11 (BK/YE).

  • Is the resistance less than 5 ohms?
Yes
REFER to Powertrain Control/Emissions Diagnostic Manual.

No
REPAIR circuit 91S-FA11. TEST the system for normal operation.
A14 CHECK THE A/C WOT RELAY

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Measure the resistance between A/C WOT relay terminal 1 and terminal 2.

  • Does continuity exist?
Yes
GO to A15.

No
INSTALL a new A/C WOT relay. TEST the system for normal operation.
A15 CHECK THE VOLTAGE TO THE A/C CLUTCH SOLENOID - CIRCUIT 14S-CA6 (VT/YE)


Disconnect A/C Clutch Solenoid


Disconnect A/C Compressor Clutch Diode



Measure the voltage between A/C clutch solenoid C952, pin 1, circuit 14S-CA6 (VT/YE) and ground.

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  • Is the voltage greater than 10 volts?
Yes
GO to A16
No
REPAIR circuit 14S-CA6 (VT/YE), 15S-FA5 (GN/BU) or 14S-CA5 (VT/BU). TEST the system for normal operation.
A16 CHECK THE VOLTAGE TO THE A/C COMPRESSOR CLUTCH DIODE - CIRCUIT 14S-CA7 (VT/BU)
Measure the voltage between A/C compressor clutch diode C972, pin 2, circuit 14S-CA7 (VT/BU) and ground.

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  • Is the voltage greater than 10 volts?
Yes
GO to A17.

No
REPAIR circuit 14S-CA7. TEST the system for normal operation.
A17 CHECK THE A/C COMPRESSOR CLUTCH DIODE GROUND FOR OPEN - CIRCUIT 31-CA7 (BK)

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Measure the resistance between A/C compressor clutch diode C972, pin 1, circuit 31-CA7 (BK) and ground.

  • Is the resistance less than 5 ohms?
Yes
GO to A18.

No
REPAIR circuit 31-CA7 (BK). TEST the system for normal operation.
A18 CHECK THE A/C COMPRESSOR CLUTCH DIODE

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Check for continuity between the terminals of the A/C compressor clutch diode in both directions.

  • Is continuity indicated in one direction and no continuity indicated in the other direction?
Yes
GO to A19.

No
INSTALL a new A/C compressor clutch diode. TEST the system for normal operation.
A19 CHECK CIRCUIT 31-CA6 (BK) FOR OPEN

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Measure the resistance between A/C clutch solenoid C952, pin 2, circuit 31-CA6 (BK) and ground.

  • Is the resistance less than 5 ohms?
Yes
INSTALL a new A/C clutch solenoid. TEST the system for normal operation.

No
REPAIR circuit 31-CA6 (BK). TEST the system for normal operation.
A20 CHECK THE AIR DISTRIBUTION CONTROL SWITCH FOR VOLTAGE - CIRCUIT 15S-FA13 (GN/RD)


Disconnect Air Distribution Control Switch C788


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Measure the voltage between air distribution control switch C788, pin 1, circuit 15S-FA13 (GN/RD) and ground.

  • Is the voltage greater than 10 volts?
Yes
GO to A21.

No
GO to A22.
A21 CHECK CIRCUITS 15S-FA17, 15S-FA17A (GN/OG) OR 14S-CA17 (VT/OG) FOR OPEN

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Measure the resistance between air distribution control switch C788, pin 2, circuit 15S-FA17 (GN/OG) and A/C cycling switch C692, pin 4, circuit 14S-CA17 (VT/OG).

  • Are the resistances less than 5 ohms?
Yes
INSTALL a new air distribution control switch. TEST the system for normal operation.

No
REPAIR circuit(s) 14S-CA17 (VT/OG), 15S-FA17 or 15S-FA17A (GN/OG). TEST the system for normal operation.
A22 CHECK CIRCUITS 15S-FA13 (GN/RD) FOR OPEN

Disconnect Heater Relay C81


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Measure the resistance between heater relay C81, pin 5, circuit 15S-FA1 (GN/BU) and air distribution control switch C788, pin 1, circuit 15S-FA13 (GN/RD).

  • Is the resistance less than 5 ohms?
Yes
GO to Pinpoint Test C.

No
REPAIR circuit 15S-FA13 (GN/BU). TEST the system for normal operation.







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