1519 Error Code

[Rhothgar]

Can anyone tell me what this is please?

Snap-On states water temp sensor

A mate's diag kit states Oil Temp Sensor.

It's on the Xantia 110 HDi.
Intermittent fault on water temp sensor where temp shows normal and gauge acts normal but red light in temp gauge sometimes comes on and goes off again.

[Damien]

P1519 Temporary Fault. Cooling function incorporated into ECU consistency between fan unit speed and setting
sounds like you got a duff coolant sensor

[RichardW]

More likely that one (or both) of the fans, or the control relays, are duff - somehow the ECU knows that the fans are not running (measures current draw perhaps?) and if they are supposed to be (eg AC on) then it flashes the overtemp light. You can test with Lexia AFAIK, otherwise, if the AC is still working, then switch it on, and at least one of the fans should start (there are 2 different fan operatios - some run both fans at half speed, switching to both at high speed when required; others run 1 fan at full speed, again switching to both at full speed when required). If at least one fan doesn't start, then either a fan or relay is duff. There is only 1 temp sensor, and if the gauge is reading ok, then the sensor is probably OK.

[addo]

The fan unexpectedly hoovers up a heavy wattage, power to the ECU dips and the gauges return odd readings. Common on Berlingo and C3 models from about 2002- '05(?). Citroën later put in a helper relay for these models but I haven't seen the circuit.

[Rhothgar]

Thanks Guys.

Well. I'm not driving the car at the moment. The other half is so obviously accurate information is non-existent. Puts the key in and drives.

This morning I got her to start engine. Without AC, nothing spins. AC on both fans at half speed. But the temp light was on and the STOP light didn't go off until temp was just under 60 degs.

I am sure it has not done this before but not 100%. Airbag light is on too.

[RichardW]

Check the water level - stop and overtemp light comes on on low level....

[Rhothgar]

All fine last time I checked but I shall check again to be sure.

[citroenxm]

It will be cooling fan operation.

A lexia will let you do a Low speed Fan test and a High speed fan test... One or other should NOT be working.

Its a bit of a grey area that warning light! But donates cooling fan warnings rather then water temperture warm up issues ...

[Rhothgar]

Cheers Paul

I'm unclear on this still.

The fans rotate when the car is at normal temp and if AC is on whether car is at normal temp or not and the car does not overheat. How can that be faulty?

I seem to recall changing one of the 3 relays at some pont perhaps this caused the issue.

Question is are all these 3 relays identical in operation and rating. If not, I suppose I might have to dig deep a get all three from Citroen to be sure they are correct.

[Rhothgar]

Drove the S2 to the NEC and back last Sunday and took more notice of what was happening with the temp gauge.

It does fluctuate but it is intermittent. Going the red light was on and off and the temp gauge dropped to 60 degs. This probably explains why the HDi is struggling to get decent MPG over a tank.

The last fill up was atrocious. 37.855mpg. That is GRIM!

I filled as we left Nottingham and upon return. Didn't quite brim it (probably a litre short but Sylv was weeping almost as it got to near £100 and she was paying) but did on return and it was 55.155mpg so I guess I probably did nearer to 60mpg as I've done on many occasion on reasonable runs before.

If the temp gauge is low on the dash would this send a signal to the ECU to indicate that the car is cold and is warming up hence using different injector timing and increasing fuel use.

[citroenxm]

37.88! JEESUS Roger! My HDi exclusive at 275k still gives me 48mpg with a heavy foot!

Heres a thought for you, I dont think the temperture would affect the MPG that much, what state is the MAF sensor like? A faulty one of those can cause adismal MPG like yours...

[Rhothgar]

Like I said, 55+ on a run but just not on the complete full last tank which was mostly around town with a trip to Stansted and back (230 miles) so it should definitely be more than the round town figure overall from Citroen's figures which I think are 37.9mpg Urban for an S2 110HDi.

Trust me I am gutted. I was unaware the 110Hdi had a MAF sensor. I'll check out over the weekend. Have you got any figures for testing it? And what would be best to clean it out?

[Rhothgar]

Rather amusingly I am back on with this.

I guess I must have had it working at some point between then and now.

Spent the day tinkering to try and get Lexia reading air con and checked all the voltages at IC92A which is the black connector with the red slide clip and just above the blower motor behind the glovebox (for anyone’s future reference).

Started the day with a red light on the coolant temperature. It had been there for a long time.

The solution was a faulty lowermost relay of the 3 that sit behind the front cowling between the headlights.

I now have no red light!

The lowermost relay has a 5 pin black connector. The ones above are both green.

The uppermost right hand side relay and the lowermost one control the low speed fan and their low current circuits are switched on at ignition. The earth for the left hand side fan is switched when the lowermost relay’s control circuit switches from pin 4 to pin 5. Pin 5 is earthed at the side of the battery. A thick yellow wire with green strips, reference M1500.

The right hand side fan is earthed at the same location. Wire M1510.

My right hand side fan is knackered. The bearings sound very ropey.

Pin 25 of the 188 pin Engine ECU must be a switched earth when it wants to actuate the fans.

Also, changed the bulb for the STOP light because I have a return pipe LHM leak and I know the level is low.

Two minor issues sorted today.

I’m coming to the conclusion that the circuitry on the Lexia for the aircon ECU might have a fault somewhere. I noticed the green LED extinguishes when I read the air con.

It did actually read the aircon ECU a couple of nights ago but then stopped.

I think I might have had the compressor unplugged when it read. Cannot recall but it did come up with an intermittent fault along the lines of control circuit current issue but I didn’t click into it so didn’t capture the DTC.

The system has no gas pressure so I bridged out pins 3 and 4 and 1 and 2 alternately at the trinary switch to fool the system into thinking there was sufficient gas pressure.

I also noted to low voltages from the engine ECU on pin 47 of engine ECU and Pin 10 at IC92A. We’re talking 11.1V instead of 14.4V. There was no voltage drop between those points so perhaps it is correct.