Honda Civic/Acura Integra

from 1994 launch

Repair and operation of the car

Check of usefulness of a state and substitution of the sensor of oxygen (l-probe)

The l-probe located in a final collector of the motor draws the content of oxygen in a current of the carried out gases. In the contact of the molecules O2 with a sensitive element of the probe the sensor develops a sign of vastness in the variety from 0,1 to 0,9 V, depending on the concentration of oxygen. And, to value 0.1 B there corresponds the high tenor of O2 (the cultivated poor mixture), and to value 0.9 B – I go down (the made rich mixture). ECM/PCM continuously controls the sign that arrives of the oxygen sensor, in case of orders of emission of necessity of the correction of the composition of the mixture of air fuel due to the modification of the duration of the opening of injectors of the injection. The best proportion of component ones of mixture of gas that guarantees the consumption of least fuel in the moment of the most efficient functioning of the catalytic converter does 14,7 parts of air in 1 part of the fuel, – his module of the management also tries to support constantly, driving for the information that arrives of the l-probe.

It must be noticed that the oxygen sensor is able to develop the alarming tension that only is heated up to the temperature of normal work (approximately 320 °C). While the sensor is in the cold condition of works of ECM/PCM in the way of the OPEN OUTLINE.

If in the motor that is heated up to the temperature of normal work and / or working inside not less than two minutes the sensor of oxygen it develops a stable sign with a vastness of 0,45 V (in turns lower than what 1500 a minute), the system of the autodiagnostic one will make entering the memory of ECM/PCM the corresponding code of the bad functioning (to see the Check of usefulness of a state and substitution of the sensor of VMT/provision of a doubled end / situation of pistons in cylinders of the motor (TDC/CKP/CYP)). The code also is brought in case of the detection of the bad functioning in a chain of heater of sensor.

In case of the violation of the usefulness of the functioning of the l-probe or his chain of ECM/PCM it passes in the way of the open outline, to ignore information that arrives of the sensor and supports the composition of the mixture of air fuel at some level of play that supplies sufficient efficiency of the return of the motor.

The usefulness of the functioning of the sensor of oxygen depends on the realization of the play of some certainties conditions:

   a) Electric parameters: the Stability of the sign of vastness of the low tension developed by the sensor in great scale depends on the quality of connections of contact of a chain of the l-probe that must happen first of all in case of problems;
   b) Provision of extern air: The drawing of the l-probe supplies the free circulation of extern air in the sensor. During the installation of the probe they always check passability of air channels;
   c) Work temperature: ECM/PCM begins to resist the information which reprimand of the l-probe only after the sensor is heated up to the temperature of normal work (approximately 320 °C). it is necessary not to lose sight of this fact checking the usefulness of the functioning of the probe;
   d) Fuel quality: the correct functioning of the l-probe is possible only in the condition of the application for the petrol station of the car of the fuel WITHOUT LEAD!

Besides the conditions enumerated in the prior paragraph in the service of the l-probe it is necessary to observe some special measures for precaution:

   a) O oxygen sensor is equipped just with the part of electrical system that is built in in him and there if are equipped of the contact capture which attempts of a lack of interest can lead to an irrevocable exit of the sensor out of the operation;
   b) Try not to allow blows in blind woman of the sensor or his electric capture of dirt and lubricant;
   c) Do not use any solvent to clean of the oxygen sensor;
   d) Doorknob with the l-probe extremely with the care, does not leave it and try not to shudder;
   e) O silicon protective covering will put in the sensor strictly definitely not to be melted and not to break the usefulness of the functioning of the probe.

To check

ORDER OF REALIZATION

1. Find the electric capture of the sensor. From a reverse side of the capture they enter in the clip of paper of office of not inclination in a nest of the contact of an alarming wire (white or red-white) (companion sees an illustration). The identification of captures of contact of the capture can be done through schemes of electric connections (to see the electric equipment of Front Side). One to positive probe of a voltômetro to a paper clip, fuses a negative conclusion. The colors of the isolation of an electrical system of the l-probe also happen in schemes of electric connections (to see the electric equipment of Front Side). 2. It controls indications of the instrument of measuring (mV) in the course of motor to be heated. 3. In the initial stage the cold sensor will develop a constant sign with a vastness of 0.1÷0.2 V (the way of the open outline). Approximately two minutes then the motor will get the temperature of normal work and the indication of the sensor will begin the flutuar in the limits from 0,1 to 0.9 B (the way of the shut outline). If it does not pass the system in the way of the shut outline or passes with the delay inaceitavelmente big (the lazy sensor), substitute the l-probe. 4. Also check the usefulness of the functioning of the heater of the sensor of oxygen. Disunite the capture of an electrical system of the probe and it joins an ohmmeter between captures of heater (to see schemes of electric connections in the electric equipment of Front Side of the present manual). The nominal resistance does 10÷40 of Ohms. 5. Check the usefulness of the offer of the food of the heater. Disunite to electric capture and tension of measure in him of a braid (again they direct schemes of electric connections). In the included ignition (they do not begin the motor) the voltômetro will fix the tension of battery. If the food if it is going away, checks a condition of an electrical system in the siege of a chain between the main alternation, ECM/PCM and the sensor of oxygen. 6. In negative results of the enumerated one above checks, substitute the l-probe.

Substitution

ORDER OF REALIZATION

The l-probe reversion in the cold motor can be extremely difficult in view of the thermal compression from metal of a final collector / the tube of the system of the launch. To avoid the risk of the damage of component ones before the initial removal of the sensor heats the motor during them one couple of minutes – they try not to be burned on the surfaces heated in the course of the implementation of the proceeding. 1. Desconecte a negative wire of the battery. The car also establishes it the Poddomkratta in stakes. If the stereosystem established in the car if it equips of a security code before desconectar the battery they secure what has the correct combination of the entry of the system sound in the action! 2. Disunite the capture of an electrical system of the sensor of oxygen. 3. Exactly there results the probe of a final collector (companion sees an illustration). 4. Before a sensor vvorachivaniye at the place they polish his part of woodcarving with the selante of antiseizure (the new sensors are already normally covered by the corresponding structure). 5. Screw the sensor at the regular place and strongly hold tight it. 6. One an electrical system. 7. Lower the car in the land and do his races of proof. Check the memory of the module of the management of the existence of codes of bad functioning.