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Coolant level sensor retrofit solved. |
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tich731
 
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 Member No: #3023
Location: Bury St Edmunds |
Further checks made and I may have blundered. The Cartier sensor I fitted(because I had one) is for an XM; the same shape and fitting to the header tank BUT with a different plug and 2 separate probes into the tank. I have measured the voltage on the signal wire at 0.65v. Vaho's guide suggests:- 5v normal level 0v low coolant If the ECU is expecting 5v and is only receiving 0.65v, would that explain the false warning message? Any electronics/computer buffs able to advise? Ralph |
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Eskimko
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 Member No: #5455
Location: Smederevo |
Can you tell me more precise where in diagbox is option to enable coolant level sensor. I cant find it anywhere. Thanks |
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tich731
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Member No: #3023
Location: Bury St Edmunds |
Having obtained and fitted the correct sensor as described by Vaho, I did not need to Programme anything using Lexia. It worked exactly as required straight after fitting. | ||
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cruiserphil
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    Member No: #38
Location: Celbridge |
Hello Ralph, Thank you for posting your successful outcome on this. I'm pleasantly surprised and take encouragement that the modification works on your 2009 car even though the feature was not available to activate in the ECU menus. Based on this, I'm going to proceed with fitting the modification to our 3.0HDi. This also has the coolant sensor option greyed out and I assumed the modification would not work in this case and didn't proceed. It's certainly worth a go!! Best regards, Phil C. |
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tich731
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Member No: #3023
Location: Bury St Edmunds |
Hello Phil, Follow Vaho's guide as I did and achieve a worthwhile outcome with the peace of mind that you will avoid an overheated engine. One slight change I made was to run the additional wires in sheathing around the rear of the engine bay behind the bulkhead sound deadening. Good luck Ralph |
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cruiserphil
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Member No: #38
Location: Celbridge |
Thanks Ralph, I applied the mod to our 2007 2.7HDi (now in new ownership) and did what you suggested with the additional wires. It turned out very neat. The mod subsequently alerted me to a leaking coolant inlet tank before the situation got critical!! Best regards, Phil C. |
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cruiserphil
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Member No: #38
Location: Celbridge |
Hello Ralph, I sent you a PM about your engine fusebox if you could have a look. Best regards, Phil C. |
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citroenroen1
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 Member No: #5495
Location: Los Angeles |
WHERE can I find the electrical connector that plugs into the COOLANT LEVEL SENSOR? Would someone be so kind as to tell me a part # or a source from another car model like a Volvo ? |
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MGmike
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  Member No: #3151
Location: South Queensferry |
All the part #'s required are documented in the tutorial document in the tech section - Click Here - AFAIK these can only be supplied by Citroen unless you find the same sensor used by other makes. If you do, please post the sources to benefit others. |
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C6Dave
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 Member No: #1
Location: Northumberland |
MGmike wrote ... AFAIK these can only be supplied by Citroen unless you find the same sensor used by other makes. If you do, please post the sources to benefit others. Still plenty of all the listed parts in the tutorial advertised online, if you simply Google each one citroen 1306E3 citroen 6541F3 citroen 6541E7 citroen 6541Z2 citroen 6541Z1 You may however have to use multiple suppliers, some in the list above I just googled do ship 'worldwide' so hopefully you can get everything you need |
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Eskimko
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Member No: #5455
Location: Smederevo |
Could anyone find pin lagout for this number of bsm 9666700180 (BSM-R02. Im not sure if pin layout is the same as on C6 and i would not like to burn my bsm. Im planing to instal the level sensor on my c5 theese days |
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tich731
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Member No: #3023
Location: Bury St Edmunds |
Check the comprehensive tutorial by Veho. It has all the details you need. - Click Here - |
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MGmike
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Member No: #3151
Location: South Queensferry |
Eskimko wrote ... Could anyone find pin lagout for this number of bsm 9666700180 (BSM-R02. Im not sure if pin layout is the same as on C6 and i would not like to burn my bsm. Im planing to instal the level sensor on my c5 theese days Take yourself over here - Click Here - and ask there. |
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tadas1991
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Member No: #5715
Location: Kaunas |
Hello, guys ! A new to the forum, fellow Citroën lover from Lithuania here. I don't have C6, nor did I ever have one, but owned a lot of different Citroens over my 14 years of driving. Had few BXs (TZD Turbo, 16 and 14 mono injection Berlines and a 19D Break), few ZXs (1.4 mono injection, 1.8i converted to a XUD7 diesel for a year of driving until MOT term expired, now planning to convert one 1.9TD to 2.0HDi 80KW), a C15 Diesel swapped with a Turbocharged engine from BX, Xantia Break 1.9TD, C5 I 2.2HDi. Now my mistress drives C3 Picasso 1.6HDi, and I try to finish 540kkm+ Peugeot 406 2.0HDi, that just doesn't die. I work as an independent mechanic of PSA (now Stellantis) based French cars, basically Peugeot and Citroën. Sometimes clients ask for this modification. Prior to a few weeks ago, I always just looked for an original connector hidden under the tank and installed and activated it, if it was there. All the other guys didn't want to pay for the wiring and uncertainty if it's going to work. But this one guy wanted it really bad and wanted to pay for a working safety solution instead of just blindly replacing the holy trinity (Thermostat housing, front outlet and degassing bubble near timing belt covers, that I call "tangerine" (mandarinas)). Just had a coolant level sensor installed on a 2010 Citroën C6 3.0HDi. I don't know the exact year of the transition, but it had two phases/stages/generations of electronics. The first one was based on a Peugeot 407 and Citroën C5 II (2005-07) platform, the second one was based on Citroën C5 X7 platform. Second generation C6s have different BSI, BSM and luckily, an HVAC block too (so, no heater flap breakage problems). But I'm sure most of You already know that. Neither Lexia, nor PP2000 or Diagbox has an option to activate the coolant level sensor. The exact car has a Delphi BSM unit and completely different underhood electronic unit's storage box (because the standard one could not accommodate a huge EDC17 Engine control unit). I read a lot about schemes and pins in this forum, and basically was ready to try and create some solution to connect and original Cartier sensor to an oil pressure sensor circuit over some relay or transistor control module. I scratched my head for hours.. BUT.... Decided to try the original method and circuits first. Found a BSM pinout in Lexia software. Also found this Spanish forum, where there is clearly stated, that you DON'T NEED to activate this function, if your car (C5 X7 or second gen C6, they have the same main units) has a Delphi manufactured BSM unit. Checked and found exactly that. So... 1st pin of the sensor went to the chassis ground bolt 3rd pin went to the 4th pin of GREY BSM connector. It already had a beefy wire installed, so I just soldered to it and sealed it properly. 2nd pin went to BROWN BSM connector 14pin. I didn't have the exact round female pin in my scrap connectors box, but managed to fit (with some dremel grinding) an older generation square pin, that fits OK for a male pin of the connection, but didn't fit in a connectors plastic housing without modifications. The Spanish guy also recommends connecting a +12V wire not to a 4th pin of GREY connector, but to a 21st pin. Because it's not occupied on newer cars. But I didn't have to modify and install two pins by just soldering it to the 4th pin wire. Soldered and heat shrink (with glue for seal) wrapped everything, routed the wires through wiper motors caviage. ET VOILA. It works without configuring the BSI. Take out the sensor from the tank and after a few seconds it starts beeping, has a SERVICE light on instrument panel, has a warning on an Infotainment screen and has a warning in Alert Log. Put it back in a coolant and everything is fine again after a few seconds. I made a hole in an original tank. Drove a chipboard screw through the centre of it, to not lose the cut-out part, and then cut it out following the visible contour. Sensor from a scrapped C5 II 2.0HDi 100kw was installed. Sadly, I measured engine oil pressure just after this work and found that it's okay at cold engine and cold oil, also OK for hot oil when revving, but it only has around 1bar of pressure idling. That may be acceptable short term or for some older, sturdy engines, but definitely not acceptable for 2.7 and 3.0HDi motors. An oil pump replacement is likely to be scheduled, hoping it would help enough, without and overhaul. I once did a complete overhaul (machining the crank and crankcase, all new bearings, pistons, etc.) for an UHZ engine in a C6. After all the work and a short run-in, we had about 2.5bar of pressure at idle with 5W30 INEO ECS oil on a hot summer day. That is acceptable, not 1bar  This is the Spanish link, that encouraged me to try it, even knowing I don't have the ability to activate it. Google Translate works magic for non-native English speakers, I'm sure native ones will have some funny moments reading, but it's good enough to comprehend. - Click Here - All the luck for everyone
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cruiserphil
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Member No: #38
Location: Celbridge |
Hello tadas1991, Thanks for your detailed post. We figured out what you have reported a while back and as you say it is successful without any Lexia/Diagbox intervention. - Click Here - Best regards, Phil C. |
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