What does it mean when a compressor is shorted to ground?
If your compressor is shorted to ground, its almost likely contaminated the whole refrigerant circuit. The age of your A/C has a lot to do with you should replace the whole system.
What to do if your a / C compressor won’t engage?
HOWEVER, if you cannot turn the compressor on, you cannot recharge your AC levels (grrrr). So you need to use a paper clip to bypass the relay switch and force the clutch to engage. You can then recharge the freon and re install the relay switch and it will sense more pressure and the clutch will engage by itself. Loading…
What to do if your air conditioner clutch does not engage?
If the clutch doesn’t engage, the air conditioning compressor can’t pump refrigerant. So start your diagnosis by determining if the compressor clutch works. Turn the air conditioning controls to MAX AC and start the engine. Then look at the front of the compressor clutch.
What to do when your air conditioner wont turn on?
Identify the location of your compressor. Look at the pullyer and you should be able to see if it spining or not. The engine running turn the A/C on max cool, set fans high, and make sure that the clutch is engaging on the compressor. The pulley spins any time the engine is running.
How is the a / C clutch connected to the ground?
When the command is received from the Climate Module, the pressure switches are OK and the engine is in a safe REV range the PCM makes a well informed decision to engage the A/C Clutch as long as is needed and safe. This is achieved by connecting the A/C output to the ground (Pin 27 on C1 connector).
Can a PCM communicate with a climate control?
If both the PCM and Climate control data wires are fine then the PCM can communicate with the Climate control (i.e. the A/C ON command get to the PCM). If any data wire issue you will have an error code.
Why is my a / C relay not grounding?
The PCM does not commands the A/C relay for some reason, either the output is shut = new PCM or does not receive the command from the Climate control module (yeah I know you replaced the module). 2. The wire from pin 27 of the C1 connector on the PCM does not makes good contact on the PCM connector or on the relay stand (hope that is your problem).
How does the PCM control the a / C CLUTCH?
The PCM is the one controlling the A/C clutch based on the data received from the Climate Control module and the following two sensors: A/C High Pressure Switch and A/C Refrigerant low pressure switch. Both switches act as SAFETY switches and you just bypassed them (not really but is better to see it like this).