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Old 10-21-2011, 12:45 PM   #1
marcus
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a/c compressor relay unit??

issue with a/c compressor clutch not activating...

i got power on the a/c button but no power being fed on the ac compressor ..fuse is ok but it seems like there might be a relay in between which toyota cant find...

anyone has a a/c diagram for our cars..??? thanks a million
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Old 10-21-2011, 01:49 PM   #2
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ive seen this issue before on other cars. the clutch activating is after it checks sensors.

make sure you ac system is charged as in a discharged system will not allow the cluch to activate.
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Old 10-21-2011, 01:50 PM   #3
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As I mentioned in your other thread - There is no relay! The AC ECU drives the compressor clutch via a FET within the AC ECU.
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Old 10-21-2011, 02:25 PM   #4
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As I mentioned in your other thread - There is no relay! The AC ECU drives the compressor clutch via a FET within the AC ECU.
so me not getting power on the compressor maybe sensor issue then.. 3 guys in toyota cant figure it out but they did check the ac fluid was full cant do compression check without the compressor spinning...
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Old 10-21-2011, 02:29 PM   #5
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so me not getting power on the compressor maybe sensor issue then.. 3 guys in toyota cant figure it out but they did check the ac fluid was full cant do compression check without the compressor spinning...
Did they actually plug the TechStream tool in and see what the AC ECU has to say?
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Old 10-21-2011, 02:30 PM   #6
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Did they actually plug the TechStream tool in and see what the AC ECU has to say?
they wont do it unless the a/c button is blinking..which is not. would an obd reader give me a code i think my frind has one..
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Old 10-21-2011, 02:37 PM   #7
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they wont do it unless the a/c button is blinking..which is not. would an obd reader give me a code i think my frind has one..
Only a TechStream will communicate with it. A regular OBDII scan tool doesn't have the protocol info for the Toyota specific diags.

There is no flashing error light mode for the AC. I know first hand, as I have and AC ECU running on my test bench that I talk to with my TechStream tool and my YarGauge. It has about 6 DTCs logged, since it has power and CAN comm connections and the only sensor connected is the ambient temp sensor.

Do you have another dealer you can work with, since it seems like the service people at this one don't have a clue as to what they are doing.
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Old 10-21-2011, 02:39 PM   #8
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Only a TechStream will communicate with it. A regular OBDII scan tool doesn't have the protocol info for the Toyota specific diags.

There is no flashing error light mode for the AC. I know first hand, as I have and AC ECU running on my test bench that I talk to with my TechStream tool and my YarGauge. It has about 6 DTCs logged, since it has power and CAN comm connections and the only sensor connected is the ambient temp sensor.

Do you have another dealer you can work with, since it seems like the service people at this one don't have a clue as to what they are doing.
ok ill try that......thanks
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Old 10-21-2011, 02:41 PM   #9
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And to double confirm that - Crashy has no AC compressor, but has everything else hooked up and her's doesn't flash either.
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Old 10-21-2011, 04:09 PM   #10
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did u try reading the ac clutch wires to see if voltage is getting to the clutch?
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Old 10-22-2011, 11:47 AM   #11
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did u try reading the ac clutch wires to see if voltage is getting to the clutch?
no power running so i need to trace that wire since fuse is ok.. it could be sensor good thing its already cold....we shall see
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Old 10-22-2011, 05:24 PM   #12
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I beleive there is a pressure sensor that detects if the refridgerant is low it will not allow the a/c compressor to engage.
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Old 10-22-2011, 10:42 PM   #13
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Per the service manual, it could be any of the below, which is why he really needs to have someone plug in a TechStream tool to narrow it down:

A/C Fuse
Refrigerant pressure
Compressor and pulley
Air conditioning pressure sensor
Evaporator temperature sensor
Air conditioning amplifier
ECM
CAN communication
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Old 03-29-2012, 11:55 AM   #14
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hey ctscott..im barrowing a techstrem next week incase we cant figure out how to test my a/c issue ...any tips?? thanks im actually betting its the ambient temp sensor but we shall see..

Quote:
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Per the service manual, it could be any of the below, which is why he really needs to have someone plug in a TechStream tool to narrow it down:

A/C Fuse
Refrigerant pressure
Compressor and pulley
Air conditioning pressure sensor
Evaporator temperature sensor
Air conditioning amplifier
ECM
CAN communication
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Old 03-29-2012, 12:13 PM   #15
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hey ctscott..im barrowing a techstrem next week incase we cant figure out how to test my a/c issue ...any tips?? thanks im actually betting its the ambient temp sensor but we shall see..
Just hook it up and see what it says. Checked the stored DTCs first (which it will display as soon as you go into the AC section).
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Old 03-29-2012, 01:57 PM   #16
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do i hook it up then start the engine or just turn the key on on acc mode...?? thanks
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Old 03-29-2012, 02:11 PM   #17
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do i hook it up then start the engine or just turn the key on on acc mode...?? thanks
You can hook it up and switch the key to "ON" to start with. You don't have to have the engine running to read the DTCs. Once you see what the codes are, then you can start the engine and attempt to engage the AC, while watching the "data" from the AC ECU.
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Old 03-29-2012, 02:30 PM   #18
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got it thanks!!!
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