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Gear box fault

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Bulldozer



Joined: 10 Aug 2019
Posts: 13
Location: Manchester

PostPosted: Sat Aug 10, 2019 18:49    Post subject: Gear box fault Reply with quote

Hi all need some help if possible     all well with my L400 until today when it stop getting first gear in drive. Only way i can get first gear is to put it in low on the gear change and then when moving put it into drive all fine until the next set of lights and then same again.

All other gears fine and reverse
No lights on dash
No switch’s in wrong place
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PostPosted: Sat Aug 10, 2019 18:49    Post subject: Google Ads keep this community free to join!


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Bulldozer



Joined: 10 Aug 2019
Posts: 13
Location: Manchester

PostPosted: Sun Aug 11, 2019 9:56    Post subject: Re: Gear box fault Reply with quote

Update noticed this morning when cold all worked okay
Until it got up to temp then back to same faults
Thinking’s did do a lot over hills just before fault happened
And used low on gears for engine brake about an hour before
Fault happen  
But drove back home 30 miles with no faults
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Lewis
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Joined: 25 May 2006
Posts: 16291
Location: Huddersfield

PostPosted: Sun Aug 11, 2019 11:06    Post subject: Reply with quote

Disconnect the battery, for a few minutes, to reset the ECU, then try again.

HTH

PS: Welcome to the Club Website.  Wink
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Bulldozer



Joined: 10 Aug 2019
Posts: 13
Location: Manchester

PostPosted: Mon Aug 12, 2019 10:31    Post subject: Reply with quote

Thanks very much for your reply
Will try that 🙏
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Bulldozer



Joined: 10 Aug 2019
Posts: 13
Location: Manchester

PostPosted: Tue Aug 13, 2019 17:16    Post subject: Reply with quote

Thanks for your support and help
But no luck with removing battery for 10 minutes also I changed auto oil
4 LT’s out of sump pan ? Pretty thin and black when cold
Will try another change tomorrow to try to remove oil out of cooler
Could it possibly any other thing to try
As it okay if set of in (Low) and then pop in in (D)
Hot or cold it’s fine
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Bulldozer



Joined: 10 Aug 2019
Posts: 13
Location: Manchester

PostPosted: Thu Aug 15, 2019 16:36    Post subject: Re gear box fault Reply with quote

Today found a code reader
Fault found code 41 svcs open
Live data shows off when in drive
Remove fault and it shows on and 1st gear works
Two minutes later fault back one shows off   So no 1st gear again
Thinking Ecu fault
Wiring
Sticking valve
Any body had this fault?
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Bulldozer



Joined: 10 Aug 2019
Posts: 13
Location: Manchester

PostPosted: Wed Aug 21, 2019 15:09    Post subject: re auto gear box fault Reply with quote

well tried a secondhand tcu same number
but no luck
in fact with secondhand tcu does fault all the time Crying or Very sad  Crying or Very sad    
anybody got any idea what to try next really missing my van now

poss keep driving it and just keep use low to set off     real pain
hope its not doing damage
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Bulldozer



Joined: 10 Aug 2019
Posts: 13
Location: Manchester

PostPosted: Wed Sep 11, 2019 13:23    Post subject: re auto gear box fault Reply with quote

still no luck
had into auto gearbox shop     tested all valves in gear box new oil no faults found
did say might only do fault when hot so could still be solenoid fault when hot so try new one
rang mitz main dealer £72.00   up to 14 weeks wait
but seeing that i can get 1st gear if i go i low thinking how can i be solenoid ?
any body got any thoughts
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Bulldozer



Joined: 10 Aug 2019
Posts: 13
Location: Manchester

PostPosted: Thu Sep 12, 2019 18:41    Post subject: Reply with quote

Hi thanks for your reply
Yes all seem to be inline only problem is after about two miles of driving it from cold it stops getting 1st gear
I have to go to L to get 1st gear and then into drive
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andyman



Joined: 08 Dec 2012
Posts: 5601
Location: Penrith

PostPosted: Thu Sep 12, 2019 19:27    Post subject: Reply with quote

As Deker will tell you, I KNOW NOTHING ABOUT l400s, BUT!!... Isn't there
a button for economy mode that means you set off in second, and does this
only kick in once the engine is warm (presumably so you don't kick out too
much black smoke while it's cold)?
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Bulldozer



Joined: 10 Aug 2019
Posts: 13
Location: Manchester

PostPosted: Thu Sep 12, 2019 20:09    Post subject: Reply with quote

Hi thanks for your message
Yes there is a mode switch that does make it in second gear but it’s  not switched on and when I put it on a computer
Shows the switch is working properly
So still at a loss
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Lewis
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Joined: 25 May 2006
Posts: 16291
Location: Huddersfield

PostPosted: Thu Sep 12, 2019 20:44    Post subject: Reply with quote

andyman wrote:
As Deker will tell you, I KNOW NOTHING ABOUT l400s, BUT!!... Isn't there
a button for economy mode that means you set off in second, and does this
only kick in once the engine is warm (presumably so you don't kick out too
much black smoke while it's cold)?



A/T Hold Mode: - Hold showing on dash (usually off) - For use when moving off, from stationary, on snow or slippery road surfaces. When the gear selector is placed in 'D' position, the vehicle is forced to take off in 2nd gear rather than 1st, to make starting easier, then go into normal mode.  This saves having to have the gear selector in 2 then move into D after you get going.  It also restrict the maximum revs of the engine to 3000rpm (approx).  Note:  The Delica Manual states:- "low revs, when under high load will generate more heat in the gearbox.  You can flip the A/T switch to any mode whilst driving without taking the vehicle out of gear.

Also starting with OD off will change things slightly in the revs and take off in 1st, omitting 2nd, then go straight into third.  As the OD does not function until the engine has reached its normal operating temp and the vehicle speed is above 50'ish KPH, it will help stop the gear box hunting for an optimum gear. But once the engine warms up and you are moving quicker it could be revving too high, until you switch the OD back on.
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Deker



Joined: 08 Mar 2008
Posts: 3833
Location: Borehamwood

PostPosted: Thu Sep 12, 2019 21:34    Post subject: Reply with quote

One for Lewis here.

Do you think that the TPS or the Speedo sensor could cause this problem.

Tho, usually the speedo sensor fault prevents the O/D working.

The poster sez "Fault code 41 svcs" - - - What is svcs  Question

Mr D
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Lewis
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Location: Huddersfield

PostPosted: Thu Sep 12, 2019 22:12    Post subject: Reply with quote

You missed the end bit of what was posted.

"Fault found code 41 svcs open"

Fault code 41 = No.1 Solenoid Valve Circuit Stuck open

Possibly dirt ingress, not allowing solenoid to close properly or an electrical fault, not allowing it to close at all.

Valve needs checking and cleaning, as required, or replacing.

HTH
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Bulldozer



Joined: 10 Aug 2019
Posts: 13
Location: Manchester

PostPosted: Thu Sep 12, 2019 22:25    Post subject: Reply with quote

Thanks for all the information
Does any one know what relays/Ecu/tcu are control the units in gear box for each gear
ie what tell it to change gear
Looking at post on tcu pin out it looks like the tcu in the center floor only for diff lock 4WD etc
Is there another ecu for auto gear motors in the bottom of auto box
Thanks for all your support
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Lewis
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Location: Huddersfield

PostPosted: Thu Sep 12, 2019 22:39    Post subject: Reply with quote

The ECU in the bottom of the centre console lower panel is the only one for the gearbox.

Gearbox changes are controlled by the TPS (Throttle Position Sensor).

See this post for more info:- http://www.MDOCUK.co.uk/forums/viewtopic.php?t=43295


HTH
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Bulldozer



Joined: 10 Aug 2019
Posts: 13
Location: Manchester

PostPosted: Thu Sep 12, 2019 22:46    Post subject: Reply with quote

Sorry Lewis posting last message before reading yours
auto gear box shop bench tested solenoids and clean out all gear box and fitted new oil
No problem or dirty parts was found
But he says it’s possible it may stop working when hot
But my thoughts how is it get 1st gear all time when I put it in (L)
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Lewis
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PostPosted: Thu Sep 12, 2019 23:23    Post subject: Reply with quote

An overheating gearbox is normally due to the gearbox hunting for the correct gear to use.

Again that goes back to an incorrect setting of the TPS, preventing the Gearbox moving to a higher gear or a faulty TPS, that needs replacing. Even a split in the wire could be allowing an intermittnt short to occur.

Hth

NB: Bare in mind I am not a qualified Auto sparky, so just going on a fair vew years of experience. I would always defer to a Pro!  Wink
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Bulldozer



Joined: 10 Aug 2019
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Location: Manchester

PostPosted: Thu Sep 12, 2019 23:31    Post subject: Reply with quote

Thanks Lewis will take a look at tps will post back after looking
Thanks for the link to TPS   Very good post
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Bulldozer



Joined: 10 Aug 2019
Posts: 13
Location: Manchester

PostPosted: Wed Sep 18, 2019 9:48    Post subject: re auto gear box fault Reply with quote

happy  Laughing
looking good at the moment  Question     revisited gear box drop off sump over weekend at home and found one solenoid  valve open circuit.
replaced with older larger type. secondhand valve and all good.     may it give up completely after auto box shop looked at it
would like to thank all for your help    will report back if any faults return on this topic
found out a lot about this topic may be I might help.    one  day thanks again  to all in club
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