The Toyota Landcruiser Owners Club

john hayes · Posted: Wed Mar 30, 2011 17:20 Post subject: AHC error C1764

Hi I have a problem with my 2006 amazon
i took it to toyota main dealer and the diagnosis said
C1764 oil pressure abnormality by not opening accumulator valve
But the service people have no idea what this means
can anyone help
john hayes

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saskia · * Joined: 16 Nov 2008 Posts: 13 Location: RSA

John according to the manual the problem area for that can be:

john hayes · Posted: Thu Mar 31, 2011 15:45 Post subject: AHC error C1764

thanks sakia
downloaded manual and have read it
Spioke to the Toyota dealer didnt let on I have read the manual and they were very evasive
when i turn on the engine and leave it idle in a stationary position the height is normal but the indicator light says LO
if i press the raise button or move forward the N light will flash for a while but no movemt upwards and the the Height control OFF light starts to flash and the N light stops flashing and the LO light stays on
The vehicle sat down on its rear end last xmas during the real cold spell and I took it to the Dealer in Jan and they said it was only a minor problem which they sorted but the indicator light has been on low ever since and the height control light flashing OFF
jmh

jvoelcker · Posted: Thu Mar 31, 2011 20:09 Post subject:

Hi John,

What year is the car and what work has been done to it so far?

We encounter a number of spurious errors on AHC systems that are often down to things like problems with sensors and rear wiring looms.

The first thing I would do it to get the fluid flushed to check the condition of it, then I would probably go back to Toyota to ask them to check the signals from the sensors, although make sure they actually know how to use the tester - there are issues with the sensors and rear loom where the correct signals fail to get through resulting in the pump over pressurising the system.
_________________
Cheers,

Julian
1994 HDJ80, with loads of mods without looking too obscene Smile

1997 KZJ95 - Gilly's - plain black and muddy on BFG ATs.

john hayes · Posted: Fri Apr 01, 2011 7:06 Post subject: Ahc error1764

Thanks julian
Its 2006
Nothing done to it in factory condition
Jmh

john hayes · Posted: Tue Apr 05, 2011 17:26 Post subject:

We have replaced all the fluid in the resevoir with new fluid from toyota and opened and cheched the rear sensor and its fine but still have flashing off light