Gear trouble - NO flashing hold light

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Re: Gear trouble - NO flashing hold light

Post by Driver+Passengers » Sat Jul 23, 2016 10:56 pm

Northern Bongolow wrote:dont know, but it only takes 2 mins to strip and clean anyway, so - - - - -
True.
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Re: Gear trouble - NO flashing hold light

Post by Driver+Passengers » Mon Jul 25, 2016 11:27 am

Can anyone identify AT fault code 16?

Doing fuel filter later today. TPS appears to test ok when warm.
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Re: Gear trouble - NO flashing hold light

Post by g8dhe » Mon Jul 25, 2016 3:00 pm

Its listed as;
Fault code table for gearbox

16 EGR valve position sensor

Which seems a trifle odd for the AT computer to be reporting but there we go ......
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Re: Gear trouble - NO flashing hold light

Post by Driver+Passengers » Mon Jul 25, 2016 3:23 pm

g8dhe wrote:Its listed as;
Fault code table for gearbox

16 EGR valve position sensor

Which seems a trifle odd for the AT computer to be reporting but there we go ......
Thanks, Geoff.

What's the source of that? http://www.philmcfadden.co.uk/MazdaDiagnosticBox.htm has that under engine faults but not transmission. I have no TEN pin, only TAT, so unsure what to make of that.

(I have blanked EGR and removed gubbins, btw, so not inconceivable, but if correct, a red herring?)
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Re: Gear trouble - NO flashing hold light

Post by g8dhe » Mon Jul 25, 2016 3:30 pm

I think in a diesel you only have one computer ? Its ECU and AT all in one , whilst on the petrol engines they appear to be seperate boards.

Diesel has a PCM unit
Petrol has a TCM and a PCM
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Re: Gear trouble - NO flashing hold light

Post by Driver+Passengers » Mon Jul 25, 2016 4:12 pm

OK - so if they're combined, I can reference the "engine table" also, and having removed EGR, I'll see if I can first silence the 16 code with a pull up or pull down - I'll work it out.

Which would mean I'm getting no codes from the ECU. I want to check revs/speed too to see if it top and lock-out I'm missing, or possibly second and lock-out. I'm thinking solenoid pack at the moment, but just wondering what, if anything, I can do to diagnose further.
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Re: Gear trouble - NO flashing hold light

Post by g8dhe » Mon Jul 25, 2016 4:24 pm

Yup probably! Several "discrepancies" between versions like Petrols don't have a glowplug light to flash an ECU error, they do have a Hold light for TCM errors but the Hold light flashes for scavenger fan errors not TCM ones :-) just to confuse the issue!
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Re: Gear trouble - NO flashing hold light

Post by Driver+Passengers » Mon Jul 25, 2016 9:42 pm

Thought I was on to something when the TPSCR wasn't testing up, tried to access the innards, destroyed the housing, then it tested up ok again! :roll:

Anyway, pulled the two shift solenoid pins out the back of the ECU connector, wrapped a couple of 12V LED leads around the crimps and put them back in, taping the LEDs to the glovebox. I get a sequence of four patterns (two on, one on, none on, other on), so I can see the ECU commanding the four gears, but I seem to only get two - 1st and 3rd. Didn't put a LED on the lock up solenoid pin - so don't know if it's commanding it or not - perhaps not if the box is still actually in 3rd, even though it commanded 4th.

Still only the EGR fault code, though (for which I've found this page on making a dummy circuit to make the missing sensor match the missing valve... http://www.route66hotrodhigh.com/EGR.html)

Anyway - my mate phoned me to say he's looking at solenoid repair videos on youtube so I'm off to do the same.

Edit: for how to remove pins from the ECU connector, found a neat animation here
http://www.1130cc.com/forums/showthread.php?t=96267
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Re: Gear trouble - NO flashing hold light

Post by Driver+Passengers » Thu Jul 28, 2016 1:04 am

Armed with the following...
- http://worldwidepartsoutlet.com/worldwi ... d%20ID.jpg
- http://www.240edge.com/manuals/89-90_240sx/auto_tra.pdf, Page 72

I dropped the valve body this evening ready to install replacement solenoid pack tomorrow. If that doesn't fix it... :cry:
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Re: Gear trouble - NO flashing hold light

Post by mikeonb4c » Thu Jul 28, 2016 8:53 am

Strange video. Depressing the button hard enough usually release plugs for me but it doesn't seem to do anything in this video. Whats it there for then? :roll:

Good luck with the solenoid pack - fingers crossed it fixes it.
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Re: Gear trouble - NO flashing hold light

Post by Driver+Passengers » Thu Jul 28, 2016 9:00 am

mikeonb4c wrote:Strange video. Depressing the button hard enough usually release plugs for me but it doesn't seem to do anything in this video. Whats it there for then? :roll:
If I get what you're getting at, the button is just to release the plug from the connector and included in that animation just to show orientation?
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Re: Gear trouble - NO flashing hold light

Post by mikeonb4c » Thu Jul 28, 2016 9:09 am

In the video, if you depress the button it looks like it would have the opposite effect of the tool? So which action is correct for releasing the plug, is what i find myself asking. :roll:
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Re: Gear trouble - NO flashing hold light

Post by g8dhe » Thu Jul 28, 2016 9:46 am

:-) Its about releasing the wire from the connector not the plug from the socket ;-0
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Re: Gear trouble - NO flashing hold light

Post by Driver+Passengers » Thu Jul 28, 2016 11:33 am

The frustration now is that having received a new solenoid pack this morning and got round to testing the old shift solenoids, they test ok - 60psi air line pressure and 12v stops the airflow.

I suspect the new solenoid pack will make no difference. I'm guessing it could be a stuck valve in the valve body or something in the gearbox itself.
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Re: Gear trouble - NO flashing hold light

Post by Driver+Passengers » Thu Jul 28, 2016 5:14 pm

Nope. When we cleaned out the filter and pan in order to refit, the flecks of what looked like alloy and copper (two distinct colours, and neither sticking to the magnet) may well support the idea that it's something more serious.

Been quoted £300 to have the valve body (off the vehicle) sent away to be checked over. Also considering a 2nd hand gearbox, fitted at not a great deal more than twice that.
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