Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
how do you know this is the problem? I would hate to spend the money and not be sure
Please RATE my answer by clicking the RATINGS button, so I can get credit for my work,,the [BAD SERVICE] and [POOR SERVICE] rating does not give me credit].i don't receive commission if you give a less than 3 star/smiley rating ..I'm not always going to be giving you good news,so please don't let this stand in the way of you accepting my answer.it does not cost you more money.we will still be able to communicate.please understand,i can not see,hear or touch the vehicle and only know what you tell me. Bonuses and positive feedback are appreciated!if you are not satisfied with my answer,please do not leave bad feed back,i will gladly opt out and let another expert handle the question.if i have sent any diagrams,please print them.they will only stay on here for an hour or so...sometimes you may need to right click the image,then save picture as]to save it to your computer so you can open it with your picture program...PLEASE ASK IF YOU NEED MORE HELP
I am unable to open the diagrams they timed out plus I had more questions.
Checked the vacuum and all is ok even replaced a hose that was a tiny bit worn.
If you hook up a vacuum directly to the acuator it will go into 4wd.
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Yes, I used this service before for my 99 Honda Accord. This last machanic must think I just sit there waiting for his reply and don't have an actual job. Thank you for responding. I will get back to you as soon as we have a chance to check out a couple of the responses. This is NOT my top priority every day, every minute. The last guy was a pain in the butt. I loved my Honda "expert"
sorry for delay, this system is pretty easy to pull codes, use this procedure and see if there is any codes stored in the system
Important: If the transfer case shift control switch buttons all blink only once and then stop, no fault codes are stored in the transfer case shift control module.
No codes came up.
Ok we are getting a clicking noise from the transfer case control module under the kick panel.
to answer your question, there is no other parts by the tccm that could be causing the clicking noise. but, I am going to have to eat a little crow. I was thinking this was a NP1 transfer case setup, when in fact you do have a NP8 auto system. my apologies. the system is pretty simple, The NV236 transfer case is an automatic transfer case with three drive ranges. Shifting from rear wheel drive to four wheel drive is done automatically when the transfer case shift control module receives wheel rotating slip information from the speed sensors. The transfer case shift control module then engages the transfer case motor/encoder to position the transfer case from rear to four wheel drive. When the transfer case shift control module receives information that the wheel rotation is the same on both axles, the transfer case shift control module sends position information to the motor/encoder to put the transfer case back into rear wheel drive. The three drive ranges are 2HI, 4HI, and 4LO. The 2HI position is for normal driving with the rear wheels pushing the vehicle. The 4HI, position is for driving through sand, snow, mud, gravel, or heavy rain at normal or slightly below normal speeds. The 4HI engages the front axle to allow for four wheel drive. The front axle is pulling the vehicle, and the rear axle is pushing the vehicle. The 4LO range is used for off road driving, heavy snow, deep mud, or shallow fording. The 4LO is similar to the 4HI except that the gearing in the transfer case is set for low speed and high torque. The NV236 is manufactured at Syracuse New York by New Venture Gear a division of New Process Gear for General Motors.
what we see most of the time, is a bad encoder motor assembly or a issue with the transfer case module. but since I am eating crow, do you have a high end scan tool that can pull codes from the tccm? or read tccm data?
to help you out,,,found out what I as you about wasit for the 4 way flashers. I don't know how this co-exists but, when you do a search for clicking noises and 4wd the "experts' say it's the TCCM. We are narrowing down this problem. Also have found aswers that say it's the sensor near the mastor cylinder which we can't find what the heck that is......
We need to go thru a list of what it is NOT so far.........
Ok, there is a vacuum switch mounted on the fire wall. this switch is for the front actuator that is cable operated. all the flow diag charts require a scan tool to perform. here is a picture of the switch you are asking about
we replaced the solenoid on the firewall...it was a cheap part,,,thought we'd try cheap first