I have a 2000 Camaro tune in a LS Swap Jaguar XJS.
The AC request comes in on pin 17 C2
the clutch signal comes in on pin 18 C2
The AC request shows in the scanner
no change in target idle
ac idle air flow equals zero
also, how would I get fan 2 to engage with ac request, pressure signal?
attached is the tune and the log
FYI, the log just has the wires for pin 17 testing it with and without the compressor engaged
You have AC request but it never comes on. What's the question? I don't think you'll get a bump in idle speed or airflow unless it activates.
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yes, the ac request comes on in the scanner when I add voltage to pin 17Originally Posted by edcmat-l1
and clutch signal to 18
but the target idle does not change and the car suffers rpm's
also, I logged clutch engaged signal and it never shows yes
That's what I'm saying to you. It looks like the PCM "sees" the ac request but the system never turns on. It is either not working, or there's a problem with that circuit that "tells" the PCM the clutch is engaged.
You should have an AC pressure pid. Adding that should tell you if it actually comes on or not.
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I did not log pressure as I do not have a pressure switch in this PSI harness, they say "you don't need it" however it looks like you do?
You might not need it but it sure would be helpful trying to diagnose this problem.
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PSI says that 1000's of customers have had no issue?
however, there are hundreds of threads about this, and no one post the answer
I fought with a swap in a truck using a 2002 operating system trying to get AC control and Efan control with the AC and such.
Found this and set it up exactly as the diagram shows and it works perfect now.
no luck, just tried that
I am getting no;
ac pressure volts
ac clutch engaged = no
ac active = no
thanks guys, I'm not giving up and I will post the answer, once we find it!
can someone please look at my files and see if I have something set incorrectly
Have you checked for actual voltage/ground signals at the pins?
yes sir, however, pin 45 C1 does not have reference voltage of 5v, and the pin 14 C2 does? coming put of the ECU,
question does the ecu actually hac=ve to see the resistance from the AC relay, I just checked it see if it is ground, and it is, all the time, crazy
There's nothing you can do in the tune file to make any of those pids read incorrectly. You can't "fix" everything with a laptop. Most problems CANNOT be "fixed" by tuning.
Havre you verified the AC is actually working when you turn it on? Have you pulled a wiring diagram that matches the engine and PCM?
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The ECU does not "see the resistance of the relay". It grounds one side of the relay coil. If you have "ground" continuous on the ground side of the relay coil, you probably don't have 12v on the other side of it. You should have 12v on both sides of the relay until the ECU commands the AC on, and then it will pull that side to ground.
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copy
what I meant to say was
I did not try a relay,
I checked the output of the pin and it is always ground ( with a Multimeter)
If pin 43 in RDF1 image is grounded, either (1) the AC clutch is engaged all of time, (2) the relay doesn't have power on 86 or 30 and the clutch never engages, (3) Relay doesn't work or (4) wiring issue.
Probably none of us has pulled a wiring diagram for what you are working on, so you talking about various pins other than from RDF1 image is probably useless. If you have the wiring diagrams available, post them.
This is frustrating. Are you foreign? Is English a second language? I'm not being a dick I'm truly asking.
In your post here, you mention pin 45. There is no pin 45. There is a pin 43. Is that what you mean, and is that what you checked? That pin should not have 5 volts Checked with volt meter, it should have 11ish volts with the AC off, and close to zero with it on. If it has zero volts on it with the AC off, you need to check for voltage at the relay pin 86.
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Did you use the resistors?
If so what was your A/C Pressure reading in the scanner?
And then how is your tune setup? It has to be right or your AC wont work and your fans wont work with the AC.
One truck i had to add 2 resistors inline for a sane reading to be read by the PCM on Pin 14 for the AC To work.
sorry for the long delay.
yes, I tested with resistors
no the PID does not read in the scanner as you can see in the log file
the wiring harness is from PSI, they do not share wiring diagrams, they suggested the attached wiring diagram in this thread.
it is as if the ECU does not have the hardware or firmware for the pressure sensor or the relay.
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