Just another thing. Gettting 5v from white and 5v from black wire. Ground I’m guessing is earth. Car takes roughly 5 seconds of cranking before starting. 

The white is a 5V supply; black is signal output to engine ECU (pin 58), brown is earth. So bearing in mind that pin 58 probably has a pull-up resistor to the 5V rail, that all seems OK if measured at disconnected G28 loom connector?

Yes mate that’s measured with it disconnected. If I connect it to the sensor and run the engine it’s still the same 

On 03/04/2020 at 13:28, Wino said:

The white is a 5V supply; black is signal output to engine ECU (pin 58), brown is earth. So bearing in mind that pin 58 probably has a pull-up resistor to the 5V rail, that all seems OK if measured at disconnected G28 loom connector?

 With the signal wire in constantly getting 5v. Surely it should be fluctuating ? Am I right in thinking that 

Yes, should fluctuate when connected, and engine running/ turning; but fast fluctuations so not sure what a digital meter wiill show. Never tried it myself.

1 minute ago, Wino said:

Yes, should fluctuate when connected, and engine running/ turning; but fast fluctuations so not sure what a digital meter wiill show. Never tried it myself.

Oh right. When testing the cam sensor it fluctuates slightly. But crank sensor doesn’t. So don’t really know what to do next. 

16 minutes ago, Jack125 said:

Oh right. When testing the cam sensor it fluctuates slightly. But crank sensor doesn’t. So don’t really know what to do next. 

 

Both sensors are hall effect devices which produce very small variable frequency AC voltages so try using the lowest AC voltage range on your multimeter, any reading would indicate that the sensor is at least functioning.

Sorry to jump in on this guys but I’m after a bit of wiring info on the 1.4 tdi engine I’ve put a 1.4 tdi amf engine into my car which originally had the 1.4 tdi bnv engine engine went straight in only needed to change egr and throttle body and starter motor car starts  and fun’s fine till it warms up then starts to hunt for diesel I’ve plugged it in no codes , on my car the engine temperature sensor has 2 wires that’s the bnv engine but on this amf engine the sensor has 4 wires so I need to know what colour wires go to what pins on the ecu for the engine temp sensor

 

cheers 

Just use the 2-pin sensor instead.

That’s what I have done but the car is not running right with the 2 pin sensor the temperature gauge in the car is work but the other 2 missing pins send a signal to ecu telling it how much fuel the engine needs to run tidy 

What car is the AMF out of? Did the ECU come with it?

As far as I know all Fabias use 2-pin temp sensors, engine ECU reads temp, then tells cluster about it via CAN comms.

Might be another reason why it's running rough when up to temp.

Did you reconnect the fuel temperature sensor on the fuel filter assembly?

The ecu is the one that was originally on the car but both cars had the same ecu edc15 and when I went to order new sensor for the amf engine which is the 75 bhp engine they said that was a 4 pin sensor then when I gave them the Reg of this car with the bnv engine 80 bhp they said that was 2 pin 

 

the car is a seat Ibiza 57 plate

the other engine came out of another seat Ibiza but that was a 56 plate and the engine ran perfect in the car I removed it from 

Whoever 'they' are were incorrect as far as I can see.  For Ibizas with AMF or BNV engines, both use a two-pin CTS, blue wire to ECU pin 112, brown to 104. No separate gauge sensor.  I'd say your problem isn't with coolant temperature sensing.

 

So you're running an AMF on an ECU that thinks it's connected to a BNV? Its software may be trying to control ancillaries that are different or non-existent on the AMF. Did you have any engine loom plugs left over after the install?

 

Any chance you could start your own thread about this, as it has nothing to do with the thread title?

 

Problem solved turned out to be the timing on the diesel pump needed adjusting engine running mint now happy days

👍  Well done for letting us know what fixed it.