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Old 09-10-2009, 08:35 PM
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Re: T-Bird Air Conditioning problems

Sorry it took so long to respond. I was trying to find out more about the WOT circuit but haven't had any luck. I don't know if the TPS signal is what is used to tell the PCM that the throttle is wide open, The factory manual just shows the relay and the PCM as being solid state devices with no internal circuitry to show what turns the relay on and off. You don't have any trouble codes saying there is a problem with the TPS so I am assuming there is nothing wrong with it. You said you had 0.047V on pin 22 of the CCRM. I am guessing that this is the WOT signal from the PCM.See if this voltage changes at all as you vary the engine speed. Mash the pedal to the floor for a second while someone watches the meter to see if the voltage changes. If the voltage does go up to around 12V with WOT then I would say the relay is bad and you will have to replace the whole CCRM. Let me know what the voltage does on pin 21 also. If it was my car and the voltage didn't change on pin 22 then I would cut the wire in a place that is easy to get to so you can splice it back together. Take a resistance measurement from both of the cut ends of the wire to a solid ground location. Let me know what you get for readings. Attach a 10K ohm resistor to the wire from the PCM and connect the other side of the resistor to a solid ground location. Connect your voltmeter across the resistor and while repeating the test see if you get a voltage drop across the resistor. If the voltage does change now then I would replace the CCRM. If it doesn't change then I would connect one side of the resistor to the wire end going to the CCRM and the other end to 12V to see if the AC clutch engages. If the clutch engages then something is wrong with the WOT circuitry in or before the PCM. I'm sorry I can't give you a straight answer on this but that is what I would do if it was my car. If you can get another OCM and CCRM out of another 'Bird you may want to go that route or spend about $30 on one of the "ask a Ford mechanic" websites. If you do try the tests, please let me know the results.
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