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Peugeot 206 Temp sensor saga ***FIXED***

Posted By Angus Thursday, September 23, 2010 3:01:52 PM
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Angus
 Posted Thursday, September 23, 2010 3:01:52 PM
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Peugeot 206  1.6ltr  16v:   NFU engine code:   X-plate '00:  62,000 miles.  VF32ANFUF 413531**

The original fault was the temp gauge intermittently jumping to the red, with the "stop" light illuminating, mainly under hard braking.

A new temp sensor was apparently fitted without success.  At the suggestion of a friend, a replacement "re-con" ECU was obtained from a dubious source called "AutoTek" in Dorset and fitted.  Needless to say the car wouldn't then start as it was immobilized...

The dealers were asked to match the new ECU to the BSI, but failed.  They then sourced another re-con ECU from ecu-testing.com.  They were unable to get the BSI to match to that one either, so replaced the BSI as well claiming that the other had spiked the BSI? 

It then started - but the rev-counter wouldn't work at all and now the fan ran on high speed every time the engine was started. 

The gauge reads correctly at KOEO; but the fan runs immediately at engine start and the gauge jumps to the red within 5 seconds - irrespective of the actual engine temp.

Having spent top-side of £1000 so far - only to make the fault worse -  the young lady owner is becoming more than a little disappointed with the efforts of the trade.  A visit to a customer garage of mine resulting in another futile attempt and a further £118 bill led to her being referred to me...

Code stored:  P0118  Coolant temp sensor input too high.  Active.  [Won't clear.]

Live-data shows a gradually rising [36-48oC] coolant temp that bears little relation to the actual temp - a default value??

The [new] coolant temp sensor is a blue 3-wire one. 

Voltages at KOEO - measured at c.70oC with sensor connected; over-temp earthing switch's 1366B wire disconnected.

Yellow 1366A - 5.00v:   Pink 1357 - 5.00v:  White 948/401 - 2.2v.

1366 goes to the [Bosch?] ECU black plug 4E: 1357 to black 4D.  Both have less than 0.5 ohm resistance.

I have no data for the white wire 948/401 - anyone?

The fan drops to slow speed at key-off and then fully off after a minutes or two. 

Searching reveals a lot of fairly similar faults that mostly seem to have been cured with new ECUs - as it's now on it's 3rd, that does seem a bit odd...?

Any thoughts?

.

Thursday, October 07, 2010 10:57:47 AM by Angus
toddy
 Posted Thursday, September 23, 2010 4:17:59 PM
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angus,,any possible config errors in bsi or engine ecu???

i would need last 8 of vin to view active diagrams for white wire info.

toddy

Angus
 Posted Thursday, September 23, 2010 4:28:26 PM
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t

Haven't been into the BSI; I'd have hoped that a dealer would have configged it correctly?

Last 8: 41353162

.

CYRIL (T)
 Posted Thursday, September 23, 2010 7:58:55 PM
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Angus

just check it I changed an BSI once and it kept throwing up the ABS light, it was a bit of a puzzle but then I found that the instrument panel  was configured to a multiplexed 206 and it was hard wired one, or the other way round  .long time ago .

Regards

Cyril

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Angus
 Posted Tuesday, September 28, 2010 4:48:44 PM
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Update

I had a bit more time on this one today, but it was pretty frustrating.

I wanted to measure the voltages in 1366 and 1357 right at the ECU plug end to prove that it must be a faulty ECU; but got derailed by the minor detail that there were TWO pink 1357s going to that plug - and initially I was, of course, on the wrong one...

The 1366 wire was even more exasperating; it leaves as a yellow wire, but none of the four yellows on plug 3 bell through to the sensor end - although terminal E4 still does.  It may be that the wire has been replaced previously as there are solder joints in several of the wires and numerous unlabelled wires.

I've told her to go back to the dealers and make a warranty claim on the ECU they supplied - this could get interesting.

.

Angus
 Posted Thursday, October 07, 2010 10:57:16 AM
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***FIXED***

Even after relieving her of vast sums of money; the dealers refused to look at the car again, or to honour her SoGA rights on the ECU that they had sourced and supplied - as they said they would get death threats...??  [Yes; really!!]

I then advised the lady to contact ecu-testing as there was also a 2-year warranty on the ECU - she removed it and they returned the ECU with an advice that there was a fault on the car that had damaged the ECU and that fault would have to be repaired before it was refitted.

I was fairly sure that there was no such fault existing, so I advised her to re-fit the ECU and try it...  [Wood was touched.]

It's finally fixed - eight months and over a thousand pounds later - an ECU fault that looks like it was never repaired in the first place.

.

hamed
 Posted Thursday, October 07, 2010 10:20:50 PM
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How much will you pay for me if I told you what is this problem is? and how to solve it?.....lol joking Smile
JamesYeldham
 Posted Tuesday, May 16, 2017 4:56:08 AM
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Hi Angus, Having spent more time trawling through the web than I care to admit, I have come across this thread which I am hoping could be the answer to my electrical nightmare!

Appreciate the original post was nearly 7 years ago, but I have a '52 Plate 1.4 Peugeot 206 that is having similar trouble to what's been described in here.
- Turn the car on, immediately goes into the "DANGER RED ZONE" on the temperature gauge when it absolutely isn't hot.

We have done the standard:
1) Take to trusted local garage who recommended a new/repair to ECU - rejected the idea as was too expensive
2) Brought in an Auto-Electrician who again recommended a new/repair to ECU - started to believe the ECU fault could be the case!
3) We went through ecu-testing.com who have as of this morning, tested and found that there was no fault with the ECU unit.

Thankfully, we haven't had the same expense as the lady you mentioned (being two new ECU's!) but I think we're in the same boat.
I'm guessing that it must be a wiring issue somewhere that is giving the fault.

Obviously without seeing the car I know you might struggle to give an idea of what could be happening, but would appreciate any advice that you could give.

Many thanks,

James
K And R
 Posted Tuesday, May 16, 2017 6:11:54 AM
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James

Click on this http://www.bba-reman.com/forums/Topic164701.aspx

Angus has not been active for a few years so don,t expect a reply from him

Start a new thread with full details of the car, your skill levels and has the wiring been fully tested under load and shorts to +/- etc

Kev.


"If you dont KNOW how it works, don,t try to test or fix it"
JamesYeldham
 Posted Tuesday, May 16, 2017 9:46:37 AM
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Thanks Kev, will do.

Cheers,

James

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