I have a 99 'vert with no mods except a B&B exhaust. Yesterday engine lite came on so figured i'd retrieve codes myself. Purchased an obd2 scanner today. ( This before i read thread on how to do it in cars dash )
Oh well too late! Surprise surprise. Had 8 dtc's as follows;
P1518
PO785
PO200
PO443
PO449
PO740
PO785
P1860
Sure the obd2 gave a description for each code ,but i'm not a rocket scientist !
I erased codes , lite is gone. Now what, will they reappear?
Can someone tell me if any of these codes are serious and if any of them could be related to the clicking noise coming from the dual climate control actuator in dash ? I tried resetting it by pulling fuse for 60 secs.

 

P1518 Throttle Actuator Control (TAC) Module Serial Data Circuit
P0785 3-2 Shift Solenoid Circuit Electrical
P0200 Injector Control Circuit
P0443 Evaporative Emission (EVAP) Purge Solenoid Control Circuit
P0449 Evaporative Emission (EVAP) Vent Solenoid Control Circuit
P0740 TCC Enable Solenoid Circuit Electrical
P0785 3-2 Shift Solenoid Circuit Electrical
P1860 TCC PWM Solenoid Circuit Electrical

If you cleared the codes and they didn't come back, I would guess that someone powered up the car when things weren't all connected. Just watch it closely for a few days.

source:http://www.digitalcorvettes.com/foru...p/t-45541.html


The P1518 is the most serious issue there.

 

Only if there is something going wrong. Drive the car for a day or two and check for any DTCs. If all is clear, then something freaked the system out. Usually when you have that many codes it's a sign that something upset the system. Usually if one or two reappear it means there is really something starting to fail.

 

Your A/C "problem" may have codes posted ..... but the OBD2 scanner won't read those. Use the DIC procedure to display ALL the codes in the car .... then post them.


I agree with dgrant3830 .... drive the car for a couple of days and see what (if anything) comes back.

 

Also, its important to note if the code has a "H", "C" OR "HC" after it.

 

OK HERE ARE MY DTCs THAT I PULLED FROM THE IPC ;
AOLDCM AIRDCM BOFRA
B2252H B2253H U1096H
2202H 2283H 1064H
2206H 2285H 1016H
2208H U1064H C2110H
2282H C2115H
2284H
2262H
2264H
U1064H

As one can see there's alot of codes, but they are all " history " and none are related to the HVAC. The car runs great except for the actuator making awful noises from dash. Does any one have other ideas ? Yes i pulled # 27 fuse for 60 secs.
Well for now i erased all DTCs and will drive around a couple days weather permitting and see what happens.
Also how long before the system " cycles " though all its parameters ie; o2 sensor, smog/air pump, anti pollution crap etc. ?

 

ANYONE OUT THERE ??
PLEASSSE HELP.

COULD THE ACTUATOR BE CLICKING IF THE R134 GAS IS TOO LOW ?
THE A/C IS BLOWING COLD ON BOTH SIDES THOUGH. THE NOISE STARTED ONLY SINCE I ADDED A 12 OZ RECHARGE .

 

R134 systems are not like the old R12. You can't just add refrigerant to it and go. I don't know if that is what you are hearing or not but have you checked to see if the compressor is turning on and off at the same time that you hear the clicking?
R134 systems need a specific amount of R134 based upon the local temperature at the time and the system requirements. Usually, it has to be done by a professional shop with the proper equipment.

 

The procedure for adding freon and getting the right amount of freon are virtually the same for R134, R12 and even the home air conditioning stuff. The difference is in the high and low side pressure and what range is acceptable. You should be able to find this info with google.

In other words, if someone knows how to do R12, then all they need are the new acceptable high pressure side and low pressure side readings when full - and a set of gauges.

You can even add it without gauges if you are sure it's low. As long as you don't turn the can upside down or rev the engine, then it won't suck too much (overfill).

If the system is completely empty, sometimes the compressor won't turn on (protection mechanism). The belt will always turn on the compressor, but if you look at the middle of the pulley, it only turns when the compressor kicks in. I click can also be heard on clutch engage/disengange. Then you have to suck the first can in by putting a vacuum on the system. Vacuum evaporates all the moisture as well, which is a good thing. Autozone rents vacuum pumps.

This may not be the "professional" way of doing it, but it's worked for me in the past on many cars.

 

I tried that on an Xterra that I had, using guages and the whole lot. But, I got too much in it and the overpressure switch was kicking it off. Apparently I didn't know enough, whereas back in the R12 days, it was easy.

 

The only things in the climate control system that would make noises are the:

Actuators: If there over driving or the gear is cracked (which would set DTCs)

Vacuum dampers moving

HVAC blower Motor. (Sometimes the squirrel cage rotor can get trash in it and make clicking noises that change with blower motor speed)

Something inside the HVAC ducts or air box blowing around. Does it change with fan speed???