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When the AC compressor clutch is engage, 25-35 psi is the norm on the low side, give or take a couple.
High side should be around 200psi
You didnt mention if you ever tracked down if you have that ground signal to energize the AC relay.
No, no negative trigger at the relay. it doesn't matter if it is on auto or manual control. I cleared the controller and disconnected the battery. After reconnecting it I still see codes 13 21 and 24.
Pressure on the low side with the compressor running is 45psi, 70+ when off.
The auto function on the controller seems to set the fans and control the flaps so all that is working just no trigger to the relay.
If I jump the negative to the relay the compressor clutch engages and cooling fans run.
I bypassed the pressure switch and the compressor still doesn't kick in. No cooling fans either.
I only see the one pressure switch on the high side, none on the low.
Activation of AC relay comes from the AC controller
AC light turns ON when pushed
-- meaning (to me) all inputs to turn on the compressor is good
If you back probe the wire that sends out the ground signal from the AC controller.
And dont have the ground signal coming out, the to me, its MOST likely a bad AC controller.
Now if you do have that ground signal coming off the wire from the AC controller.
But not activating the AC relay, then i would trace down a broken wire.
BTW, your schematic is not for your model vehicle.
45 psi on the low side w/ the AC clutch ON is a little too high for me.
Maybe you overcharged it.
Activation of AC relay comes from the AC controller
AC light turns ON when pushed
-- meaning (to me) all inputs to turn on the compressor is good
If you back probe the wire that sends out the ground signal from the AC controller.
And dont have the ground signal coming out, the to me, its MOST likely a bad AC controller.
Now if you do have that ground signal coming off the wire from the AC controller.
But not activating the AC relay, then i would trace down a broken wire.
BTW, your schematic is not for your model vehicle.
45 psi on the low side w/ the AC clutch ON is a little too high for me.
Maybe you overcharged it.
I had 35 psi when running but went and added a little more since I was getting the error 24 low charge.
The schematic matches the vehicle but you're correct, the components do not match. I can't see why that is but will need to verify tomorrow.
Why does the controller give me error code13 and 24? 24 is low charge, clearly not the case however. The only part to control that is the pressure sensor.
I'll check for a ground output at the controller tomorrow.
Thanks, none the less I see a code 13 21 and 24 currently in the controller. Would those prevent the system from sending the negative trigger to the relay?
In most cases, if there is an issue the compressor should kick on amd then kick off if a problem exists. I don't see any activity at all and no trigger at the relay either
Solar codes 21 and 24 will NOT have an effect on AC clutch operation.
13 is an EVAP temp sensor circuit
EVAP temp sensor detects the cooled air temperature that has passed through the evaporator and to control the air conditioning.
To my knowledge, this also wont hinder AC clutch operation.
FWIW, A bad AC controller will also trip this code.
Solar codes 21 and 24 will NOT have an effect on AC clutch operation.
13 is an EVAP temp sensor circuit
EVAP temp sensor detects the cooled air temperature that has passed through the evaporator and to control the air conditioning.
To my knowledge, this also wont hinder AC clutch operation.
FWIW, A bad AC controller will also trip this code.
Thank you, that is what I was looking for. I checked the schematic again found that the negative trigger is sent from the ECU to the relay and the hvac controller supplies the negative the ECU. I'll trace both circuits tomorrow.
Again, appreciate your help!
I'll verify by the color of the wire to the relay and confirm at the ecu and hvac control.
Thank you, that is what I was looking for. I checked the schematic again found that the negative trigger is sent from the ECU to the relay and the hvac controller supplies the negative the ECU. I'll trace both circuits tomorrow.
Again, appreciate your help!
I'll verify by the color of the wire to the relay and confirm at the ecu and hvac control.
what was the outcome of this issue? Having same issue now with my car
And i have left cold right hot o amd othet ettatic outputd but foxwell unit shows evap sendor reading -21 C which is inreal as I live in the tropics🙂
So I suspect the evap temp tells ecu it is too cold so no compressor on.
So gonna change evap sensor. Looks like a pita job.
Meantime ease update your situation for the rest of us.
Thx
Last edited by Arussto; Apr 20, 2021 at 04:09 PM.
Reason: Typo
