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Check for battery voltage on the dark blue/yellow wire in the connector at the AC clutch with engine running and AC on. If no voltage, yank the AC relay and check for battery voltage on terminal 86 in the relay socket. If no battery voltage on that terminal, check fuse 21. If yes, check for ground on terminal 85 in the socket. If no ground, then PCM isn't commanding the AC clutch on. Check for voltage on the dark blue/yellow wire at the low pressure switch and good ground on the black wire. The PCM provides power to the low pressure switch which then goes to ground. The PCM is looking for a large voltage drop if pressure is above 34-38 psi. If pressure is below that, the switch will be open, so the PCM won't see a voltage drop and will prevent AC clutch operation. The high pressure switch should be closed at pressures below 270-330 psi
Normally you would check for voltage at the relay then the low pressure switch, then the compressor clutch. With the system charged or the low pressure switch bypassed you should have 12 volts at the clutch and ground. You can also check the clutch with an ohms meter to see if the magnet is open.
A mechanic would start at the compressor and work back. Did you jumper the low pressure switch, or the relay, or put power directly to the ac clutch ? You have a low pressure switch that should be closed and a high pressure switch that should be closed to put power to the compressor clutch. If the freon pressure drops below 20psi the low switch opens, if it goes above 300 psi the high switch opens.
you don't have enough pressure in your system. odds are you have a leak someplace and the factory installed a saftey switch to keep the ac from running when there is no pressure. This way you don't end up burning up your compressor.