1.9 8v Sensors And There Whereabouts

[m@ttc 30]

hi can anybody help please? i was wondering if anybody can tell me all the sensors and what they do and where they are please, for a 1.9 8v engine. Maybe a good idea to have it in one place rather than serching? the thing is i have three brown wires, two goto two sensors i dont know what there for, one has a red single terminal plug and one a black single terminal plug, and ones just goes nowhere with the copper showing, whats that meant to do? . Iv'e been trying to search for answers but i dont know what there for, so dont know what there called, im sure its been covered thou. The two sensors are above another sensor which i think is a temp sensor with a blue two terminal plug on it.

Thanks in advance.

[DrSarty 90 1 Cars]

Firstly you should either get a hard or electronic copy of the 205 Haynes manual. There's a PDF version downloadable from M@tt's signature on here. Reading this manual (even just bouncing through the pictures) will answer most of your questions.

 

But think it through logically.

 

From your first post, the 2 pin blue sensor is a management sensor (needed by the ECU) telling the ECU the coolant temperature. The other 2 senders (not sensors) in that area - the coolant housing on the side of the head where the thermostat is - are for the dash coolant temp gauge and warning light, meaning the latter is a switch not a sender although they look similar.

 

There's an oil pressure sender and switch in the front of the block (the sender looks like a mushroom) and there's an oil temp sender in the sump.

 

There are 3 other sensors that the ECU needs. 2 are together in the AFM (air flow meter): one is for air mass the other for air temp. And finally there's the TPS, which in this case is a throttle position switch IIRC rather than a sensor.

 

That's all of them UNLESS you have a cat fitted in which case you'll have an O2 (Lambda) sensor/probe as well.

 

Get your head buried in the Haynes manual. It'll pay you back in spades.

Edited December 6, 2009 by DrSarty

[m@ttc 30]

Firstly you should either get a hard or electronic copy of the 205 Haynes manual. There's a PDF version downloadable from M@tt's signature on here. Reading this manual (even just bouncing through the pictures) will answer most of your questions.

 

But think it through logically.

 

From your first post, the 2 pin blue sensor is a management sensor (needed by the ECU) telling the ECU the coolant temperature. The other 2 senders (not sensors) in that area - the coolant housing on the side of the head where the thermostat is - are for the dash coolant temp gauge and warning light, meaning the latter is a switch not a sender although they look similar.

 

There's an oil pressure sender and switch in the front of the block (the sender looks like a mushroom) and there's an oil temp sender in the sump.

 

There are 3 other sensors that the ECU needs. 2 are together in the AFM (air flow meter): one is for air mass the other for air temp. And finally there's the TPS, which in this case is a throttle position switch IIRC rather than a sensor.

 

That's all of them UNLESS you have a cat fitted in which case you'll have an O2 (Lambda) sensor/probe as well.

 

Get your head buried in the Haynes manual. It'll pay you back in spades.

wow thanks for that if thats a oil temp sender on the back of the sump it may explain why my oil temp guage dont work. its not connected, and i cannont find where the wires gone could this extra brown wire be it? it goes into the same cable protective sleave as the dash coolant temp guage and warning light. Edited December 6, 2009 by m@ttc

[DrSarty 90 1 Cars]

wow thanks for that if thats a oil temp sender on the back of the sump it may explain why my oil temp guage dont work. its not connected, and i cannont find where the wires gone

 

Ooh, and I always forget one! There's the crank angle sensor on top of the gear box.

[m@ttc 30]

Ooh, and I always forget one! There's the crank angle sensor on top of the gear box.

my oil temp guage dont work. its not connected, and i cannont find where the wires gone could this extra brown wire be it? it goes into the same cable protective sleave as the dash coolant temp guage and warning light.

[DrSarty 90 1 Cars]

my oil temp guage dont work. its not connected, and i cannont find where the wires gone could this extra brown wire be it? it goes into the same cable protective sleave as the dash coolant temp guage and warning light.

 

I would guess so, but if you touch it to earth, e.g. clean metal on the sump or block (with the ignition on) and the oil temp gauge jumps to max then yes, that's it.

[chrisj21 2]

The oil temp sensor/sender in the sump, the wire goes to the brown multiplug located near the gearbox. most likely to have snapped off at some point.

 

I can't recall which wire at the moment.

 

Chris

[pug_ham 244 3 Cars]

Ooh, and I always forget one! There's the crank angle sensor on top of the gear box.

Not on a 1.6 or 1.9 8v unless its a late 1.9 8v on motronic with a cat.

 

Judging by the area you have the two sensors with no wires to them I'd guess they are the dash coolant temp guage & temp warning light with the third being your oil temp sender wire.

 

IIRC the one with the red terminal cover goes to the smaller red ringed sensor which is the dash temp guage & the black one goes to the bigger of the two & thats the temp warning light.

 

The oil temp sender wire often gets damaged by heat due to it running near the exhaust manifold, best way to check is to touch the bare wire to the dash with the ignition on & with someone sat in the drivers seat check if the guage goes to full scale defelection. If it does then you need an extra length of wire with a rig terminal on & join it these two pieces together with the ring terminal on the sender in the sump.

 

Graham.

[m@ttc 30]

hi can anybody help please? i was wondering if anybody can tell me all the sensors and what they do and where they are please, for a 1.9 8v engine. Maybe a good idea to have it in one place rather than serching? the thing is i have three brown wires, two goto two sensors i dont know what there for, one has a red single terminal plug and one a black single terminal plug, and ones just goes nowhere with the copper showing, whats that meant to do? :D . Iv'e been trying to search for answers but i dont know what there for, so dont know what there called, im sure its been covered thou. The two sensors are above another sensor which i think is a temp sensor with a blue two terminal plug on it.

Thanks in advance.

thanks for you help guys the cable was indeed the oil pressure. the guage went straight up when earthed out, also its only brown as like you said it must have been burnt away as its white when it goes into the brown multi plug. i thought the switch in the sump might be a level sensor? dont i have one? any way will be connecting up when i find some cable so thanks..

[pug_ham 244 3 Cars]

Very few 205 GTI engines have the level sensor, if they do they are on the back of the block not in the sump though anyway.

 

IIRC it was only tried for a year & were found to be unreliable so they stopped fitting them.

 

Gaham.