How to check your ACIS

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littlemisstubby
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How to check your ACIS

Post by littlemisstubby » 29/06/13 14:25

Hello everyone. :D

Following requests for a 'how to' guide on checking the ACIS system I managed to knock one up.

Let me know what you guys think. :D
It would be nice for it to go in the KY2. ;)

Enjoy. ;)

Part 1:
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This guide will show you how to check to see if you have a fully working ACIS system.

This guide is for testing the ACIS system on the N/A MR2, however it can also be used to test the T-VIS system on the turbo MR2.

The simple test:
To see if the ACIS is working as it should be follow this simple test -

Firstly, with the engine idling, see if the actuator mechanism has moved the internal butterflies to the 'closed' position -
connectedup.jpg
Next, disconnect the actuator vacuum pipe. You should then see the mechanism move to the 'open' position -
disconnected.jpg
Next, reconnect the vacuum pipe, allow the mechanism to move into the 'closed' position once more then switch off the engine. With no power going to the ACIS solenoid the mechanism should now move to the 'open' position.

This test makes sure that the solenoid, actuator and butterfly mechanism are working as they should be and that the solenoid filter is clean and free from blockages.

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End of part 1. :D
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Re: How to check your ACIS

Post by littlemisstubby » 29/06/13 14:43

Part 2 -

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'That didn't work'

If that test didn't work and something is wrong with ACIS then we need to diagnose the system.

Firstly check the actuator mechanism by trying to move it by hand. The mechanism can get rusty and is prone to sticking so may need to be freed off with the use of some WD40 or equivalent.

If the mechanism moved freely then we need to test the actuator.

Remove the solenoid pipe from the actuator and fit a length of hose to it -
actuator.jpg
Now apply some vacuum to that pipe. You should see the mechanism move. If it does then the diaphragm in the actuator is fine. If it doesn't then the actuator is at fault and needs replacing.

If those tests went ok then we need to check the vacuum hoses. Take a look at all the ACIS hoses for splits and cracks and make sure they are all securely pushed on to the actuator, inlet manifold outlet, solenoid and vacuum reservoir. If they look fine also check the vacuum reservoir for splits and cracks.

The solenoid and vacuum reservoir are located underneath the inlet manifold -
locate.jpg
You can see the solenoid, with the filter attached, underneath the vacuum reservoir shown in the picture.

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End of part 2. :D
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Re: How to check your ACIS

Post by littlemisstubby » 29/06/13 15:08

Part 3. :D

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Testing a solenoid

If all that is good then we need to check the solenoid and its wiring.

Remove the vsv, which is secured by a 12mm bolt, and take off its vacuum hoses and wiring connector.

Inspect the solenoids wiring connectors, both on the loom and on the solenoid itself and make sure the terminals are nice and clean and free from corrosion. Also check to see if the wires going in to the connector are secure and not corroded.

Now to test the solenoid -

Using a multimeter, set to resistance (ohms), test across both the terminals for continuity -
open.jpg
This tests for an open circuit. If there is no continuity then replace the solenoid.

Now check for ground by testing each terminal against the body of the valve -
short.jpg
If there is continuity then replace the solenoid.

Now connect a hose as follows -
hose.jpg
Now blow through the hose. You should feel the air pass through the filter side of the solenoid (closest to the wiring terminals).

Next apply 12v across the terminals of the solenoid and repeat the test. This time the air should go through the other side of the vsv, closest to the hose.

If those tests do not work and no air comes out then the solenoid is blocked. If the air only comes out of one port then the solenoid is stuck and may need replacing.

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End of part 3.
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Re: How to check your ACIS

Post by littlemisstubby » 29/06/13 15:19

Part 4. Am I boring you yet? :laughing

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With the solenoid removed from the car also check the filter -
filter.jpg
Check to see if air can pass through the filter ok and it's not blocked up.

Finally test for voltage at the loom vsv connector. You should be getting 12v across its terminals with the ignition switched on.

Note: When refitting the solenoid the vacuum hoses are fitted as follows -
From the inlet manifold feed the vacuum hose goes to the vacuum reservoir. From the 90 degree outlet on the reservoir the hose goes to the horizontal outlet on the solenoid (in line with the filter). Then from the vertical outlet on the solenoid the hose goes to the actuator.

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Job done....... I think........ :)

Let me know if I should add anything else. :D
All comments welcome. :D
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Re: How to check your ACIS

Post by jimi » 29/06/13 16:10

littlemisstubby wrote: Let me know what you guys think. :D
It would be nice for it to go in the KY2. ;)
:clapping:
Excellent, thanks for taking the time to write this up and take the pics, it's much appreciated :th:

Minor detail, it may be worth mentioning that for the continuity and insulation checks the multimeter needs to be set to the resistance (ohms) just for those who are not familiar with multimeters ;)

I can guarantee it will make an appearance in KY2 :cool1:
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Re: How to check your ACIS

Post by littlemisstubby » 29/06/13 16:15

jimi wrote:Minor detail, it may be worth mentioning that for the continuity and insulation checks the multimeter needs to be set to the resistance (ohms) just for those who are not familiar with multimeters ;)
Good call! :blush: :D Edited. :notworthy: :D
I can guarantee it will make an appearance in KY2 :cool1:
Woohhooo! :yahoo:

Thanks Jimi. :cool1:
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Re: How to check your ACIS

Post by mwmackenzie » 29/06/13 21:22

great writeup, Thanks! :clapping:
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Re: How to check your ACIS

Post by jimi » 30/06/13 2:46

Black is not a colour ! .... Its the absence of colour
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Re: How to check your ACIS

Post by littlemisstubby » 30/06/13 9:51

mwmackenzie wrote:great writeup, Thanks! :clapping:
I'm glad you like it. :D
Thanks Jimi. :notworthy: :D
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Re: How to check your ACIS

Post by turbomeister » 02/07/13 14:04

Nice guide T. :D
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Re: How to check your ACIS

Post by littlemisstubby » 02/07/13 16:09

Thanks Jamie. :D
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Re: How to check your ACIS

Post by sykesMr2 » 16/12/14 16:16

Hate to bring up an old thread but if I have no power going to the solenoid plug where does the wire go to and does it have a fuse ?
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Re: How to check your ACIS

Post by littlemisstubby » 28/03/15 14:29

sykesMr2 wrote:Hate to bring up an old thread but if I have no power going to the solenoid plug where does the wire go to and does it have a fuse ?
Hi mate. Sorry for the late reply. been a busy gal.

The solenoid itself doesnt have its own fuse (Its linked with the efi fuse). It has two wires. One of which goes to the ecu, the other links with the EFI relay iirc. You may need to do some continuity tests on those two wires. Check the connector too to make sure the terminals are clean and rust free. :)
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Re: How to check your ACIS

Post by r2d2 » 21/04/15 15:23

Any tips on temporarily disabling the acis?
My solenoid is leaking air.

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