AC sensor issue. 78 series

Submitted: Saturday, Jul 23, 2022 at 15:35
ThreadID: 144164 Views:5744 Replies:7 FollowUps:16
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Hi All

I've gone and created the first problem that my car has EVER had (excluding 1 blown head light globe) in almost 18 years.
I had some of the AC ducting off on the passengers side looking at how to bring a cable through the firewall. Didn't disconnect any cables, however when I drove the car (with duct out) and turned corners I could here a clear clicking, on and off, each time the warning light would come on and off on the dash. My guess is it was detecting a pressure issue, AC continued and continues to work fine. Anyway, I drove around for a bit like this and the clicking stopped....., and the light is stuck on, seems a N/O contact has become a permanently closed one :-(

Any suggestions anyone?

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Lyndon
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Reply By: GarryR - Saturday, Jul 23, 2022 at 16:06

Saturday, Jul 23, 2022 at 16:06
without anyone knowing year, make and model, it would be hard for someone to help with your problem. Secondly, have you thought of looking at a forum that is designated to your vechile. here may be many answers to your question.
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Follow Up By: Member - lyndon NT - Saturday, Jul 23, 2022 at 21:14

Saturday, Jul 23, 2022 at 21:14
Good point, no need for model or year. FTE says it all to anyone in the know.
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Reply By: Member - LeighW - Saturday, Jul 23, 2022 at 17:22

Saturday, Jul 23, 2022 at 17:22
Honestly can't see how driving with the inside air ducting being removed would cause an issue.

My concern would be you wrote when you turn the clicking occurs, this sounds like something being disturbed when you move the steering. What warning light is coming on, if it is the engine check light then it may not have anything to do with the airconditiong, you may have diturbed something else when you have been poking around?
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Follow Up By: Member - lyndon NT - Saturday, Jul 23, 2022 at 21:16

Saturday, Jul 23, 2022 at 21:16
Hi Leigh

Thanks for your input. Didn't touch the drivers side, just removed duct on passenger side. It's is possible I've disturbed something though not likely.

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Lyndon
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Reply By: Member - Wooly - Saturday, Jul 23, 2022 at 21:09

Saturday, Jul 23, 2022 at 21:09
Hi Lyndon,

Have a look at LCOOL for anything Landcruiser related.

Have you ruled out the flasher relay?
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Follow Up By: Member - lyndon NT - Saturday, Jul 23, 2022 at 21:13

Saturday, Jul 23, 2022 at 21:13
No, but doubt that would cause an engine light. But will check.
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Follow Up By: Member - lyndon NT - Saturday, Jul 23, 2022 at 21:13

Saturday, Jul 23, 2022 at 21:13
just emailed to join LCOOL
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Reply By: qldcamper - Sunday, Jul 24, 2022 at 05:09

Sunday, Jul 24, 2022 at 05:09
What code is active, or logged?
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Follow Up By: Member - lyndon NT - Sunday, Jul 31, 2022 at 09:50

Sunday, Jul 31, 2022 at 09:50
Hi

The old Troopy is a bit primitive for codes, just a light.

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Reply By: Bob Y. - Qld - Sunday, Jul 24, 2022 at 09:16

Sunday, Jul 24, 2022 at 09:16
Disconnect the negative terminal for a while, or overnight? Used to work on my FTE.

Don’t need to pull all that ducting out to get wiring through the firewall, Lyndon. Just remove the glove box liner, and all will revealed!

Bob

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Follow Up By: Member - lyndon NT - Sunday, Jul 31, 2022 at 09:52

Sunday, Jul 31, 2022 at 09:52
Hi Bob

Yeah, had the glove box out also. Tried your disconnect trick, no luck I'm afraid :-(
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Follow Up By: Member - lyndon NT - Sunday, Jul 31, 2022 at 09:54

Sunday, Jul 31, 2022 at 09:54
PS, do you like the mileage on the old girl :-)
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Follow Up By: qldcamper - Sunday, Jul 31, 2022 at 11:43

Sunday, Jul 31, 2022 at 11:43
That is a brake warning light.
Probably nothing to do with what you did.
Check your fluid and rear brake adjustment then reset the switch on the mastet cylinder.
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Follow Up By: Member - lyndon NT - Sunday, Jul 31, 2022 at 13:34

Sunday, Jul 31, 2022 at 13:34
Right, I knew it was that but thought it doubled as a warning light for other things. My bad, brake fluid is good. Have had hand brake issues though. Wouldn't be a wear issue for the disks and or pads eh?
How do u reset it?
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Follow Up By: Member - David M (SA) - Sunday, Jul 31, 2022 at 13:50

Sunday, Jul 31, 2022 at 13:50
"do you like the mileage on the old girl"
I gather it's on it's second time around. :)
Dave.
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Follow Up By: Member - lyndon NT - Sunday, Jul 31, 2022 at 14:02

Sunday, Jul 31, 2022 at 14:02
Hi Dave

Nah, fortunately not :-)
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Follow Up By: qldcamper - Monday, Aug 01, 2022 at 07:50

Monday, Aug 01, 2022 at 07:50
I am hesitant to give much more advice as I am not sure what master cylinder is fitted to that model and it could be something more serious. I do not carry professional indemnity insurance.

In this situation I would recomend seeking professional help.
Do something wrong in there and it could have catastrophic consequences.
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Reply By: qldcamper - Wednesday, Jul 27, 2022 at 06:59

Wednesday, Jul 27, 2022 at 06:59
Any follow up to this one Lyndon?
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Follow Up By: Member - lyndon NT - Sunday, Jul 31, 2022 at 09:53

Sunday, Jul 31, 2022 at 09:53
Hi

Sorry about the slow replies. Elderly sick parent problems :-(
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Reply By: Member - lyndon NT - Sunday, Jul 31, 2022 at 14:08

Sunday, Jul 31, 2022 at 14:08
A BIGGGG sigh......................................., sorry for wasting your time. Life is a bit stressful ATM, I thought I'd checked the brake fluid..................., must have had my eyes shut.
It was down. Topped up, issue gone.

Handbrake has been making noises on and off since I installed those new dog bones. Figured they were not allowing drums to fully disengage. I changed the fluid last Christmas, so there must be a leak somewhere. Nothing obvious to be seen from below.
Kinda tired of pulling those drums off the rear!

Cheers
Lyndon
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Follow Up By: Frank P (NSW) - Sunday, Jul 31, 2022 at 16:49

Sunday, Jul 31, 2022 at 16:49
"Handbrake has been making noises on and off since I installed those new dog bones."

IIRC I read somewhere that the OEM dog bones had an issue and that after market ones were available to correct the problem.

Sorry, not a Toyota man now so no expert knowledge, but I wonder if the handbrake noises are related to the dog bone thing.

Sorry I can't be more specific but it might be worth investigation. I did find this as an afterthought, particularly the red text halfway down the page:

Dog bone link.
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Follow Up By: Bob Y. - Qld - Monday, Aug 01, 2022 at 19:21

Monday, Aug 01, 2022 at 19:21
Lyndon,

If your brake fluid has dropped since Christmas, that’s over 8 months ago remember, your front brake pads may need checking? As they wear, the level in the master cylinder reservoir drops, as the piston in the callipers extends. Replacing is an easy task, if you haven’t done it before?

Check pad wear from behind the calliper, using a torch is best.

Bob

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Follow Up By: Member - lyndon NT - Monday, Aug 01, 2022 at 20:49

Monday, Aug 01, 2022 at 20:49
Hi Bob

Despite seemingly like a novice from the original post, it's actually not quite the case. More a case of TÒ much going on, but not enough thinking.
I've replaced the Rotors before. Have a look at the odometer reading above for a laugh. I even had one year when the old girl only went to the dump and back a few times..., 300 km for the year that time.
A few more this year but not many.
Your spot on about the brake pad wear V the reservoir level dripping though.
I'm guessing the seals have gone on 1 or the rear callipers. Wonder whether the longer dog bones did this... (should it be the case).
Heading out of town this weekend for the first time since 2019
I'll take a spare bottle of fluid just in case.
Will do a full rebuild at Christmas. Probably won't drive it again after this week

Cheers
Lyndon
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