Suspension, Steering and Brakes P2646 - VTEC Oil Pressure Switch Circuit Low Voltage

Discussion in '7th Generation (2003-2008) [Acura TSX]' started by hsyasin, Wednesday 11th Mar, 2015.

  1. hsyasin Valued Contributor ★ ★ ★ ☆ ☆

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    oh hey, @SpeedyGee @Ichiban , remember i had an engine light come up a while back and then it never appeared again after i did an ECU reset.. well as it so happens, it came up this morning while coming to work :Messed:
    well came to work and one of my colleagues had those obd2 reader, one of those that have screen attached to it and requires no bluetooth.. so hooked it up and bam P2646:Aghast:..:no:
    A quick search on google revealed its some oil switch that needs cleaning.. any suggestions on how to approach this?
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    i was just about to send that reader back to @RogerH69 as its been sitting there doing nothing..
    good job i put it in my rucksack so that i could post it when i get time from work.. will plug that in as well and see what that does
     
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  2. SpeedyGee Administrator Staff Team

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    I assume your oil level is correct ?

    So possibly faulty VTEC pressure switch/controller but worth cleaning the VTEC control solenoid and VTEC strainer.

    Give me some time I will gather some info for you on how to remove the VTEC controller and the strainer.

    Just make sure your oil level is correct though for starters.
     
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  3. hsyasin Valued Contributor ★ ★ ★ ☆ ☆

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    thanks alot mate
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    found this video:
     
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  4. SpeedyGee Administrator Staff Team

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    What grade of engine oil are you using and how often do you change it ?
     
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  5. hsyasin Valued Contributor ★ ★ ★ ☆ ☆

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    using 0w30, exol, bought it as 25litre from here when i first joined..
    well, last change, i got a bit too lazy and changed it around 10k miles... i know :telloff:
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    and another thing, i didn't change oil filter, as i couldn't remove it.. still stuck there..
     
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  6. SpeedyGee Administrator Staff Team

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  7. hsyasin Valued Contributor ★ ★ ★ ☆ ☆

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    oh God, another purchase :no:..
    I mean, i've got that cloth type one, but it turns out i'll need a cup one
     
    Last edited by a moderator: Saturday 14th Mar, 2015
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  8. SpeedyGee Administrator Staff Team

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    It's either that or get someone else to take it off for you.
     
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  9. hsyasin Valued Contributor ★ ★ ★ ☆ ☆

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    hmm..
    how much is it anyways?
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    oh had a look online, there r quite a few on ebay, but don't know what size cap honda filter is
     
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  10. SpeedyGee Administrator Staff Team

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    From memory I thinks it's 65mm - 14 flute.
     
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  11. hsyasin Valued Contributor ★ ★ ★ ☆ ☆

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    Well chaps, let me tell u what happened yesterday.. Well i was going home from work and was gonna get some takeaway from newmarket on my way home, a bit of a detour, but no much.
    Now my daily driving nowadays doesn't involve long stretch of motorway, as i found a new route to work, which involves country road driving with a small patch of A14. But going to newmarket involves going thru a long stretch of A14.
    Now since i saw that engine management light last week, i started driving her gently, trying to keep revs under 3k, so that i don't do much damage or don't upset her more.
    Well, yesterday, i was in a rush to get home, so while going to newmarket, i thrashed her a bit on A14, and as soon as i entered newmarket area, slowed down a bit and looked at the dash, and bing the light was gone.. nowhere to be found:party:
     
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  12. Zebster Expert Advisor ★ ★ ★ ★ ★

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    Bulb's blown!
     
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  13. hsyasin Valued Contributor ★ ★ ★ ☆ ☆

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    nooou, it does turn on when u turn the ignition on and then goes off
     
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  14. Nels Moderator Staff Team

    Italian tune?
     
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  15. SpeedyGee Administrator Staff Team

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    I wouldn't ignore the problem though, personally, I would still go ahead with oil, oil filter, clean up of mesh and VTEC solenoid.
     
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  16. hsyasin Valued Contributor ★ ★ ★ ☆ ☆

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    @Nels not a proper Italian tune up, just rushed to join the motorway and kept changing lanes with u know, gearing down and :Whoosh:past slow moving cars :vtec:

    @SpeedyGee yeah ur right, it is logged into my brain now, has to be done.
    is there any diy here to clean mesh and solenoid?
     
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  17. SpeedyGee Administrator Staff Team

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    There isn't currently.

    So you could create one once you've done yours :Wink:

    That video you posted tells you what you need to do.
     
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  18. hsyasin Valued Contributor ★ ★ ★ ☆ ☆

    United Kingdom Hammad Bury St. Edmunds
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    Yeah, sure will do.
    but, when i had a look at my engine after looking at the video, i couldn't quite correlate it to my engine, or i may be looking in the wrong direction.
     
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  19. SpeedyGee Administrator Staff Team

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    The oil strainer is number 10 in this diagram, to get that off you first need to take off the aux belt and then remove the tensioner pulley

    The VTEC oil pressure sensor is on the VTEC controller which is at the back left of the engine, it's number 4 in this diagram.

    As you are cleaning things up you ideally want to remove the VTC controller too but this involves removing the offside engine mount and lifting the engine to get the VTC solenoid off which I guess you probably don't want to do.
    Screenshot 2015-03-14 06.09.30.

    Here's a close up of the VTEC controller showing the VTEC Oil pressure switch (B)
    Screenshot 2015-03-14 06.01.41.
    Another close up of the VTEC controller showing the three bolts that need to be removed to remove it.
    These are quite awkward to get to.
    Screenshot 2015-03-14 06.00.58.
     
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