LS1b PCM, A/C Type

[Caleditor]

Thanks Mark,
I'm not having any troubles understanding or implementing any of the cooling fan options. I am mostly curious about the "A/C On" command input to the PCM for the different A/C Types. There appears to be 3 different types of A/C. I am wondering, do the different types take a different input to the PCM for the On command (12Volts or Neg trigger, Momentary or Constant input)? Since the input/request pin is C1-17, I'm assuming none of the types are Serial input.

Jeff

Jeff I have tuned so many AC parameters and fan parameters for swap jobs I have lost track of all of them. The PCM must have the correct service number or Tom and I can convert a non DBC PCM into a DBC PCM. The fan tune gets kind of funny. You must know a lot of details to get it correct.



Most PCM Calibration has 5 Fan options
Mechanical Fan
Electro Mechanical Fan like in the T-Blazer, but an option on 2003+ regular trucks
Single Electric Fan
Dual Electric Fans
Auxiliary Fan

The Calibrations have 2 AC Compressor Types
Fixed Displacements that need to be cycled on and off to prevent freeze-up
Variable Displacement that runs all of the time and even at WOT. These use a wobble plate.

The AC systems have several types of AC switches and sensor configurations. The calibration need to be correctly configured to the switch and sensor configuration. The fan settings need to be correctly configured to the switch and sensor configuration options.

Switches and Sensors
Low Pressure Switch
High Pressure Sensor -- 3 wire
High Pressure Switch -- mounted in the back of the AC compressor
High Pressure Switch -- Mounted on the AC Comp Discharge line
AC Auto Recirc Switch