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...?