ahc low light

Philip amos

Member
Supporter
I am in uk
Jan 30, 2019
186
71
28
manchester uk
i had a burst pipe replaced and rear springs ,the globe pressures ok.However the other day with six people aboard the low light came on when all had alighted the vehicle all was well again .When the garage blead the system they didnt use as much fluid as expexted , could air in the system cause this,the ride is fine
ive been driving around for a few days now and all is fine (unladen)
 

hodgy0_2

New Member
Nov 3, 2019
12
1
3
i had a burst pipe replaced and rear springs ,the globe pressures ok.However the other day with six people aboard the low light came on when all had alighted the vehicle all was well again .When the garage blead the system they didnt use as much fluid as expexted , could air in the system cause this,the ride is fine
ive been driving around for a few days now and all is fine (unladen)
Mine does this, when i have over 6 adults in, i was told it is normal a "false low" reading
 
J

jibberjabber

Guest
Mine does this, when i have over 6 adults in, i was told it is normal a "false low" reading
Hi,

I don't know who gave you this info, but theres no such thing as a 'False Low' the AHC cannot give a false low, low is low, if you understand how the AHC system works then you will know why there can't be a false low.

If your AHC is going into 'low' without you putting the there, then there is something else wrong, the system is designed to carry 7 adults, and should stay in 'N'

Good Luck.
 
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Philip amos

Member
Supporter
I am in uk
Jan 30, 2019
186
71
28
manchester uk
Hi,

I don't know who gave you this info, but theres no such thing as a 'False Low' the AHC cannot give a false low, low is low, if you understand how the AHC system works then you will know why there can't be a false low.

If you AHC is going into 'low' without you putting the there, then there is something else wrong, the system is designed to carry 7 adults, and should stay in 'N'

Good Luck.
 
J

jibberjabber

Guest
I think it’s pump or pressure valve as it’s gone to low now and flashing off code c1762 pressure on techstream
In my humble opinion, I think you may have air in the system.

Check out AHC C1762 on mud.
 
J

jibberjabber

Guest
There you go, a more knowledgeable member than me has jumped in.

Good luck.
 

hodgy0_2

New Member
Nov 3, 2019
12
1
3
Hi,

I don't know who gave you this info, but theres no such thing as a 'False Low' the AHC cannot give a false low, low is low, if you understand how the AHC system works then you will know why there can't be a false low.

If your AHC is going into 'low' without you putting the there, then there is something else wrong, the system is designed to carry 7 adults, and should stay in 'N'

Good Luck.
Hi

I was told this when I had my torque converter replaced by Overland Cruisers a few years ago

my car has always read low when I have had 7 people in - it does not seem to physically go into the low height setting, the car still sits at the normal (to the Mk1 eyeball) height and drive normally,

and as soon as the 7 person gets out the dash light reads normal

but happy to be corrected, maybe height sensor is off

in fact I will bleed the system anyway - I have not done it for a while
 
Last edited:
J

jibberjabber

Guest
Hi

I was told this when I had my torque converter replaced by Overland Cruisers a few years ago

my car has always read low when I have had 7 people in - it does not seem to physically go into the low height setting, the car still sits at the normal (to the Mk1 eyeball) height and drive normally,

and as soon as the 7 person gets out the dash light reads normal

but happy to be corrected, maybe height sensor is off

in fact I will bleed the system anyway - I have not done it for a while
It's not just a case of eye ball and changing the fluid, it's also a case of rear springs, torsion bars, ACCUMULATORs front and rear, AHC fluid, hight sensors, hydraulic rams, and other thing I can't think of at the moment, if you wan't to know why your Active Hight Control goes into 'Low' when you have 6 or 7 people in you car then ask someone who knows a lot about the subject, uHu or Paddo just to think of two off the top of my head.

But I can tell you there is no such thing as a 'flase low' and with all due respect to Overland Cruisers who are far more knowledgeable when it comes to 4x4's than I am, but I would ask the question, are they experts on how Toyota Active Height Control functions, and experts on the service and maintenance or Toyota AHC.

Toyota AHC is a service item just like any other suspension, and just like any other suspension if maintained well it will last the life of the car, but unfortunately there are not many people who understand how it works, and that includes Toyota mechanics at Toyota dealerships.

I am no expert on AHC by a long shot, but I do know that AHC will only go into 'L' or 'H' if you put it there, default is 'N' for normal, if it goes into 'L' or 'H' it's self then there is something wrong, or at least the warning of the start of something going wrong.

Just think, Toyota designed the 100 to seat 7, if the AHC kept going into 'low' when they were first sold there would have been thousands if not hundreds of thousands of complaints.

Hope this helps, good luck.
 
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