Oil level measurement invalid

[thundermaster]

Hi to all again,

I also recently had my aternator belt cut and it pulled the oil level sensor wiring. We repaired the cut wire but the indication is still there. The diagnostic read overvoltage at the sensor. Is it possible that the sensor is burnt and needs to be replaced?

Thanks!

[thundermaster]

Is there any diagram to locate the line of the oil level sensor?

Thanks

[GiveMeABreak]

I'd just replace it - especially as you know the wiring was damaged in one place - it may well have caused more damage at the sensor or to the internal wiring.

[thundermaster]

Thanks Marc, last week a lot of prpblems, I feel the engine not working normally on idle, two times the car went in safe mode (3000 rpm) without any reason. After switching engine off and on, safe mode disappeared. No any engine lights in the dash. On idle, the cabin light also is flickering. The only thing I changed a month ago is the cooling system ventilator, because the previous broke. I don't know what is going on. I changed the spark plugs

[GiveMeABreak]

Best to get a proper diagnostic on it and put up any codes you get. The fact that the engine ECU has put the car into backup mode means there is a problem that 100% will have generated a fault code. Depending on the fault, turning the ignition off and on again can reset it, but the fault will of course return until the underlying causes are resolved.

[thundermaster]

Overvoltage on all 4 cylinders, faulty oil sensor, errors don't erase at the moment. Maybe a shortcircuit? But where? Electrician suspects fuse box in the engine compartment. Car on idle works erratictly, but no engine indicator i the dash.

[GiveMeABreak]

The engine ECU feeds the power to the injectors via the harness - so you need to know if its a problem with the supply to the engine ECU, the harness or the engine ECU itself.

[thundermaster]

Thanks Marc!

Is there a way to find out how many cables had the three-pin oil level sensor connector and where the wiring goes? I think I saw only two cables for the three pin connector when we lift the car. I purchased a new sensor (Valeo 366200) but I have not replaced it yet. My engine is RFJ (EW10A) VIN VF7**************[VIN obfuscated, can be read by forum staff].

[GiveMeABreak]

4100 : engine oil temperature + level indicator

Wiring / Pins

414: Oil level / signal
415: Oil level - signal

This will be a 3 pin green connector, but only 2 pins are used.

[thundermaster]

Many many thanks Marc... Does this have also a fuse? I will check...

[GiveMeABreak]

No, if it was fused it would show a link to one of the fuseboxes, so is only low voltage and supplied by the engine ECU as I mentioned earlier.

[thundermaster]

Many thanks Marc! Sensor just replaced, problem not solved.

[thundermaster]

I think that there is also another point of cut cable, but does this require anything from lexia in order to start work again?

[xantia_v6]

For reference, the oil level sensor contains a thermistor, which is a resistor that varies its resistance with temperature. The ECU uses a small current to read the initial resistance (hence temperature), then feeds a high current for a couple of seconds. This heats up the thermistor but the temperature rise is slowed by the surrounding oil that is acting as a heatsink. Thus the oil level can be calculated.

[GiveMeABreak]

I think that there is also another point of cut cable, but does this require anything from lexia in order to start work again?

There's nothing in Lexia that needs doing for replacing the oil sensor. If you suspect further damage, then more in-depth investigation may be required to determine any other damage. Unfortunately if you can't locate or repair the obvious damage, there may of been some internal damage as a result of when the wires were cut / shorts, so it may require a new engine harness....