diagnostics

Selling off one (or bits :o) of your XM collection, or perhaps searching for those elusive headlight washer covers? This is the place to do it.
Timcol
Knows how to use the parking brake
Posts: 201
Joined: Tue Jan 21, 2020 8:36 pm
Orga / RP numbers: RP 7183
Series 2
2.0 16v Sx
1997

Re: diagnostics

Post by Timcol » Wed Mar 03, 2021 11:33 am

I just got parts for blink code reader from RS components so will make one myself.
Thanks
Tim

Timcol
Knows how to use the parking brake
Posts: 201
Joined: Tue Jan 21, 2020 8:36 pm
Orga / RP numbers: RP 7183
Series 2
2.0 16v Sx
1997

diagnostics

Post by Timcol » Wed Mar 03, 2021 7:30 pm

Hi
I am building my own blink tester to test for faults can not get lexia to work, I am sure I read somewhere to check 3 ecu fuses, does anyone know there numbers/location

Thanks
Tim

xmexclusive
Global Moderator
Posts: 5925
Joined: Wed Apr 15, 2009 8:11 am

Re: diagnostics

Post by xmexclusive » Wed Mar 03, 2021 9:26 pm

RP7184 is a major change date for electrics.
The main fuse board had a major set of modifications.
Citroen had a habit of changing a few days early on some of the production lines.
Check your owners manual as one page has a picture of the fuse boards and a list of fuse functions.
Then check your fuse board against the picture.
The modified fuse board (7184 on) has an over length fuse in the centre spanning the position of two fuses.

Dieselman
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Posts: 13734
Joined: Thu Jun 18, 2009 6:44 pm

Re: diagnostics

Post by Dieselman » Thu Mar 04, 2021 6:52 am

Fuses for what, to make the Lexia work, or the Blink Code reader?

Each Ecu has a diagnostic output line to the 30 pin socket.
The 30 pin socket also provides power and Gnd for diagnostic equipment to draw from, so those supplies are needed.
A Blink Code reader doesn't need power to be supplied from the 30 pin socket as it connects directly to the battery, or any other convenient supply.

Without checking, the fuses for the diagnostic socket are shown in the Owners Manual and Gabor's circuit diagram.
A quick check with a test lamp, or DMM, will reveal whether the appropriate pins have power/Gnd.
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Timcol
Knows how to use the parking brake
Posts: 201
Joined: Tue Jan 21, 2020 8:36 pm
Orga / RP numbers: RP 7183
Series 2
2.0 16v Sx
1997

Re: diagnostics

Post by Timcol » Thu Mar 04, 2021 8:21 am

Thanks will have a look today
Tim

Timcol
Knows how to use the parking brake
Posts: 201
Joined: Tue Jan 21, 2020 8:36 pm
Orga / RP numbers: RP 7183
Series 2
2.0 16v Sx
1997

Re: diagnostics

Post by Timcol » Thu Mar 04, 2021 4:14 pm

OK, Built a blink tester only ecu it would read was suspension found faults but wouldn't clear them, looked up on internet and found a chap that exactly same problem could only see suspension ecu with same faults that wouldn't clear and could not see other ecu's, not sure if there is a problem suspension either seems drive ok. I was wondering if series 2 pin outs for blink codes are the same has anybody else had same problem and found a work round, might have to ask if I can meet up with someone local and see if their Lexia can get in.
What a pain in the a_se
Tim

xmexclusive
Global Moderator
Posts: 5925
Joined: Wed Apr 15, 2009 8:11 am

Re: diagnostics

Post by xmexclusive » Thu Mar 04, 2021 5:30 pm

I think I posted some different diagrams of 30 pin sockets with pin allocations , think there were 3 variations during the XM build programme.
To get the Lexia 30 pin plugs to fit fully and make contact on a Mk 2 XM I found it necessary to remove the locking clip.
Not needed to use the Lexia in anger for quite a while.
A recent try gave me the similar problems to you so I have asked around to see if others now have problems.
Citroen changed the access for maintenance information to a paid system recently.

Timcol
Knows how to use the parking brake
Posts: 201
Joined: Tue Jan 21, 2020 8:36 pm
Orga / RP numbers: RP 7183
Series 2
2.0 16v Sx
1997

Re: diagnostics

Post by Timcol » Thu Mar 04, 2021 9:49 pm

Thanks for answering I think that it will be a bit of try and error and a bit more searching.
Tim

Dieselman
Global Moderator
Posts: 13734
Joined: Thu Jun 18, 2009 6:44 pm

Re: diagnostics

Post by Dieselman » Fri Mar 05, 2021 7:01 am

Check the pin-outs for the 30 pin socket are correct for each Ecu by looking them up in Gabor's circuit diagrams and, if necessary, perform a continuity check back to the Ecu connector.
I recall the diagrams for 30 pin connectors are the plug in connector, not the socket, so are mirror image, i.e. The row is correct, but the pin numbers (1-3) are reversed.

When using a Blink Code reader try holding the button slightly longer than the stated 15s for reset.
Also, you can only reset after reading all the codes, not as a single operation.

Disconnecting the battery should reset all fault codes, as afaik, none of the Ecu have non-volatile memory.
92 2.1SED M.RP5740 ECZ Sable Phenicien
92 3.0 V6-24.Rp 5713 EXY Black
92 2.1SD M.RP 5685 ENT Blue Sideral
Prev
90 2.1SD M.RP 5049 EJV Mandarin
92 2.1SD A.RP 5698 EJV Mandarin
94 2.1SD A.RP 6218 ERT Triton Green
91 2.0SI M.RP 5187 EWT White

Timcol
Knows how to use the parking brake
Posts: 201
Joined: Tue Jan 21, 2020 8:36 pm
Orga / RP numbers: RP 7183
Series 2
2.0 16v Sx
1997

Re: diagnostics

Post by Timcol » Fri Mar 05, 2021 10:14 am

Gabor's diagrams only show 2.0 turbo, it shows same pin outs as I'm using tried connecting c3 marked as warning light not diagnostic tried putting down to earth that didn't work, also I do not appear to have any pin outs on rows B and D, I think my engine is later than that, as you say will disconnect battery clear the faults and try and forget about diagnostics for a while.
Thanks
Tim

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