Quote:
Originally Posted by Tech II
On the old pressure cycling switch of the old CCOT system, you could jumper out the switch to see if that was the problem.....you can't do that with the pressure switch.......
Have you checked hi/lo pressures with car off? should be close to ambient temp, for example, if it is 70 F outside on a cold engine, hi/lo = 70 psi......if much lower, you have a leak.....
Do you have access to a scan tool? Does it read the same a/c pressure as the gauges?
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I do not have a scan tool...at least not an OBD1. What I did do is with the ignition on and the engine off and the pressure sensor disconnected and the ac selector to the "max" position with a digital volt meter I jumpered reference (gray) wire and the signal (red/black) wire and it measured 4.84 volts which is below the 4.92 (high end) volts. Using DVM I connected the reference (gray) wire to ground. It measured near 5 volts (4.98). I also connected the reference (gray) wire and the ground (black) wire and it measured 5 volts (which is reference voltage). So I know the ground wire is good. In addition I did replace the signal wire (red/black).
The sensor is a new replacement. I have tried 2 different PCMs (used) with the same results. I believe the wiring and connections are all good. Now the sensor may be a lemon. Or it could be that the code (1530) is present and until it is cleared it won't operate the compressor. Beyond that I am at a loss of what is next.