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Sensor Testing

The Lambda Sensor is at the heart of emission control continually monitoring the exhaust gas. Carbon Monoxide (CO) is produced by the engine. If the mixture supplied is too rich then CO will be high and visa versa. Having plenty of fuel (Rich) the engine will try to burn as much as possible, using up all available Oxygen, conversely if there is not sufficient fuel to maintain a correct burn then the excess Oxygen will pass into the exhaust system.

Rich mixture = High CO = Low Oxygen
Weak mixture = Low CO = High Oxygen

The Zirconia lambda sensor, by using precious metals, can determine the Oxygen difference between atmosphere and the exhaust gasses. The greater this difference, the higher the voltage it will produce, up to app 1volt. Lambda sensors will not operate until around 300 deg. They are heated by the exhaust and often have their own heater element. Single and twin wire lambda sensors have no heater element and are usually situated near or in the manifold, three and four wire sensors have an built in heater to aid rapid warmup and may be placed further downstream.

From the table it can be seen that the voltage produced changes significantly within the window lambda 0.97 - 1.03. The ECU monitors this voltage and can correct the mixture strength (by changing the injector open time) to try to maintain perfect combustion.

The sensor can be tested for output by connecting to it a digital voltmeter, set to a 2v scale. Connect the +ve test lead to the sensor signal wire [See wire colours] and the -ve test lead to earth/battery -ve. The voltage produced should swing from app 0.2v to 0.8v and back around once per second. If the voltage is stuck high then the engine is probably running rich for some other reason. If stuck low then usually either a faulty Lambda Sensor, air leak or an engine running very weak for some reason.

The newer type of lambda sensor (titania) work on a different principle, changing a supplied voltage as against creating one, but they still measures the Oxygen differences. These later types are generally more accurate and responsive.

Paimta is http://www.lambdasensor.com/main/mtesting.htm

cia labai platus intervalas.teisingai parodo kad zondas veikia bet ar teisingai ji supranta masina cia kitas klausimas. nes pvz pas V8 pagal manual zondas turi dirbti tarp 0.4-0.5v o kitos jau ribos netinkamos. taigi... zondai siais laikais visi universalus. ir daznai pasitaiko teorija kas tinka viskam netinka niekam...
arba kita medalio puse brangus zondai turi jautresne platesne voltazo skale kuri daugiau prisitaiko arba masina daugiau prisitaiko prie jos ir viskas veikia teisingai.
todel patarimas nepirkite pigiu liambda zondu.nes norimo poveikio gali ir neatsirasti.

jei lambda vieno laido tai kur det voltmetro galus?

Vienas laidas prie liambdos, kitas prie mases.

Pas mane irgi 2,8, kai pirkau tai trauka nebloga buvo..O dabar jau mazokai..as manau, gal cia dujos ytakoja(gal varikly drozia labiau), bet dujos tiesiogines, gal kas zino, ar dujos ytakoja lamdos darba???

no one: girdejau ivairiu atsiliepimu apie Liambdos salinima is NG, tu sakei, kad viskas ir liks po senovei, kitas zmogus sake, kad ja isemus prasidejo dideles nesamones su variklio darbu tai kaip ten is tikruju yra ?

pas mane nera lambdos....bt veikia masiniukas =] aisq man nepatinka tas salto variklio apsuku pradinis sokinejimas, bt praeina....

Gal kam nors kada nors pravers:

Oxygen Sensor Inspection & Analysis

ar visuose bulkose 1988m. 1.6 karbuose stovi Lambda zondas?

as ziurejau pas mane i ismietimo koliektoriu eina laidas ir pas teva irgi eina golfe irgi karbas

jei islupi kataliza lemdo nebereikia bet cia aisku ne pas nauja masinas
pas NG tikrai tai galima padaryti
lemda reikalingas tam kad katalizas optimaliai atliktu savo darba ir ilgai tarnautu
jei blogai dirba lemda zondas katalizas gali sudegti greiciau arba uzsikimsti priklausomai koks kuro kiekis pareina
o lemdo deka tas kuras pakoreguojamas yra kad katalyze kuo daugiau CO persiverstu i CO2 ir maziau butu tersiama aplinka

Nezinau is kur tokios mintys,bet lembda ir afrikoj lembda.Jam pofig yra katalizas ar nera.Dirba matuodamas deguonies santyki viduj ismetimo ir isorej.O katalizas sutrupa nuo kuro misinio,degimo neatitikimo,tepalo patekimo.Lembda reguliuoja ecu ,o tas reguliuoja kuro misini.Be katalizo lambda puikiai veikia.

Kas gali nuosekliai paaiskinti, kaip patikrinti su vag-com zondo darba? Neradau tinkamos info. Aciu is anksto.