Lexia + AL4 help

If you have Automatic gearbox problems or issues that would only affect an Auto, please ask here.

Please provide as much information as possible including photos you have taken and uploaded directly to the topic.
Forum rules
One question per topic about an Auto or semi-auto gearbox can be posted in this section
No engine questions
Think: Auto not changing up or down, snowflake/sport flashing, flappy paddles, actuator fault and sensodrive not changing gear.
My Name: Baldseas-54

Contributor
Posts: 14
Joined: Thu Feb 11, 2021 1:44 pm
Model: C3 2006-2009, Facelift model
Year: 2006 (06)
Engine Size: 1.6 (16v)
Fuel Type: Petrol
Mileage: 141200
Trim Level: VTR+
Gearbox: Automatic PRND
DPF: No
LHD or RHD: RHD
Been thanked: 6 times

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Hello Again,
I would love a little help understanding the the below results shown in the attachment
below, I have installed two new (generic ) Electro Valves into the hydraulic block of my 2006,1.6 petrol .. which all seemed straight forward thanks to some wonderful instruction from this forum and Arfer Dent, thanks people. anyway the test run proved a little shaky with the gear changes and the problems of prior to replacement seemed a little worse,
however then the car went into "safety mode" (Limp Mode?) now the second part of this puzzle is how do I get
the this state back to normal and any suggestions as to what my problem is?
Also I did a diagnostics audio test via Diagbox on the electro valves and the buzzing sound seem to be normal.
thanks in advance. (from the land downunder!) Hence the upside down Pics lol

Pressure regulation (difference/setting)
Pressure regulation (difference/setting)
Fault Code 06 automatic gearbox Citroen C3 Lexia
Fault Code 06 automatic gearbox Citroen C3 Lexia

Citroen C3 Engine ECU identification VIN
Citroen C3 Engine ECU identification VIN
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My Name: Ozvtr

Moderator
Posts: 942
Joined: Wed Jul 10, 2019 3:31 am
Model: C3 2002-2005, Original shape model
Year: 2003 (53)
Engine Size: 1.4 (8v)
Fuel Type: Petrol
Mileage: 80000
Trim Level: Other
Gearbox: Automatic PRND
DPF: No
LHD or RHD: RHD
Engine name: TU3 (75 PS)
Location: Brisbane, Australia.
Has thanked: 36 times
Been thanked: 252 times

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G'day mate! LOL! Where do you hail from? I'm from Brizzie.

Looks like this was not long after start up (the oil temp is only 33') and the gearbox was attempting to change a gear. The turbine speed and engine speed don't match, meaning the torque converter has not locked up yet. So my guess is it was attempting to change into 2nd.
Ok, if you look at "oil pressure" it says 1.05 Bar. Then look at "selected pressure" it says 6.0 bar. They should be the same...6 Bar or similar, hence the pressure regulation fault.

Your generic pressure regulator valve is not doing the job. Yes, you can hear it buzzing during the actuator test but bad ones will buzz too.
The other option is a blockage in the associated oil gallery in the valve body, but that's unlikely.
One of our members here had a similar problem installing a new valve...it was faulty. Replacing the brand new faulty valve solved the problem.
Looks to me like you might be suffering the same problem.
My Name: Baldseas-54

Contributor
Posts: 14
Joined: Thu Feb 11, 2021 1:44 pm
Model: C3 2006-2009, Facelift model
Year: 2006 (06)
Engine Size: 1.6 (16v)
Fuel Type: Petrol
Mileage: 141200
Trim Level: VTR+
Gearbox: Automatic PRND
DPF: No
LHD or RHD: RHD
Been thanked: 6 times

Post

Love the accent mate lol .. yeah I'm from Maryborough and thanks for your help, just two questions if I may .. Is it possible to pin point the faulty valve or should I replace both and from where should I source locally if at all? the two I purchased were from England but took an age to get here.
Cheers
User avatar
My Name: Ozvtr

Moderator
Posts: 942
Joined: Wed Jul 10, 2019 3:31 am
Model: C3 2002-2005, Original shape model
Year: 2003 (53)
Engine Size: 1.4 (8v)
Fuel Type: Petrol
Mileage: 80000
Trim Level: Other
Gearbox: Automatic PRND
DPF: No
LHD or RHD: RHD
Engine name: TU3 (75 PS)
Location: Brisbane, Australia.
Has thanked: 36 times
Been thanked: 252 times

Post

Baldseas-54 wrote: Sun May 30, 2021 2:28 am Is it possible to pin point the faulty valve or should I replace both and from where should I source locally if at all? the two I purchased were from England but took an age to get here.
The main pressure modulation valve is the one on the right (furthest from the engine) when viewed from the front but most sellers sell them as a pair.
A quick look on Ebay shows Aussie sellers selling 2 Chinese valves for about $70.
I honestly couldn't tell whether the main pressure modulation valve is the cause or the converter pressure modulation valve, it's just as easy to replace both at the same time.
Look up Al4 DPO solenoid valve on Ebay.
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