Honda Accord

1998-1999 of release

Repair and car operation



Honda Chord
+ Honda Accord brand Cars
+ Settings and routine maintenance
+ Engine
+ Systems of cooling, heating
+ Power supply system and release
+ engine Electric equipment
- Engine management
   System of onboard diagnostics (OBD) - a principle of functioning and codes of malfunctions
   Removal and installation RSM/ESM
   Check of serviceability of a condition and replacement of the sensor of provision of a butterfly valve (TPS)
   Check of serviceability of a condition and replacement of the sensor of absolute pressure in the pipeline (MAR)
   Check of serviceability of a condition and replacement of the sensor of temperature of soaked-up air (IAT)
   Check of serviceability of a condition and replacement of the sensor of temperature of cooling liquid of the engine (eats)
   Check of serviceability of a condition and replacement of the sensor of VMT/provision of a cranked shaft (TDC/CKP)
   Check of serviceability of a condition and replacement of the sensor of position of pistons (CYP)
   Check of serviceability of a condition and replacement of the detector of control of electric loadings (ELD)
   Check of serviceability of a condition and replacement of the sensor switch of pressure in system of hydrostrengthening of a wheel (PSP)
   Check of serviceability of a condition and replacement of the oxygen sensor (l-probe)
   Check of serviceability of a condition and replacement of the sensor of a detonation
   Check of serviceability of a condition and replacement of the sensor of speed of movement of the car (VSS)
   Check of serviceability of functioning and replacement of the valve of stabilization of turns of idling (IAC)
   Check of serviceability of functioning and replacement of the air valve of correction of structure of an air and fuel mix (FIA)
   System of operated ventilation of a case (PCV)
   System of a retsirkulyatsiya of the fulfilled gases (EGR) - the general information, check of a condition and replacement of components
   System of catching of fuel evaporations (EVAP) - the general information, check of a condition and replacement of components
   The catalytic converter - the general information, check of a condition and replacement
+ gear shifting Box
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ electric equipment Schemes





Check of serviceability of a condition and replacement of the oxygen sensor (l-probe)

Located in a final path of the engine the l-probe traces the content of oxygen in a stream of the fulfilled gases. At contact of molecules About 2 with a sensitive element of a probe the sensor develops a peak signal in a range from 0.1 to 0.9 In, depending on concentration of oxygen. And, to value 0.1 In there corresponds the high contents About 2 (the grown poor mix), and to value 0.9 In - low (the enriched mix). RSM continuously supervises a signal arriving from the oxygen sensor, in case of need giving out commands for correction of structure of an air and fuel mix at the expense of change of duration of opening of injectors of injection. The optimum ratio of components of the gas mixture, guaranteeing the minimum fuel consumption at the most effective functioning of the catalytic converter, makes 14.7 parts of air on 1 part of fuel, - its module of management and tries to support constantly, being guided by information arriving from a l-probe. On considered models of cars two oxygen sensors are used; the primary is located in a final collector of the engine, and secondary - below the catalytic converter. By comparison of level of the content of oxygen on sites of a final path is higher and below the RSM catalytic converter defines also efficiency of functioning of the last.

It should be noted that the oxygen sensor is capable to develop alarm tension only being heated-up to normal working temperature (near 320°С). While the sensor is in a cold condition, RSM works in a mode of the OPENED CONTOUR.

If at heated-up to normal working temperature and/or the engine working during not less than two minutes the oxygen sensor develops a stable signal amplitude below 0.45 In (at turns not less than 1500 in a minute), the system of self-diagnostics brings in memory of RSM the corresponding code of malfunction (Р0131 or Р0132). The corresponding code is brought also in case of detection of malfunction in a chain of a heater of the sensor (see. The section System of onboard diagnostics (OBD) - a principle of functioning and codes of malfunctions).

In case of violation of serviceability of functioning of a l-probe or its chain of RSM passes to a mode of the opened contour, ignoring information arriving from sensors and supporting structure of an air and fuel mix at some set level providing sufficient efficiency of return of the engine.

Serviceability of functioning of the oxygen sensor depends on performance of set of some certain conditions:

a) Electric parameters: Stability of a peak signal of a low voltage developed by the sensor in big degree depends on quality of contact connections of a chain of a l-probe which should be checked first of all in case of problems;
b) Supply of external air: The design of a l-probe provides free circulation of external air in the sensor. At probe installation always check passableness of air channels;
c) Working temperature: RSM starts to react to information arriving from a l-probe only after the sensor will be heated-up to normal working temperature (near 320°С). It is necessary not to lose sight of this fact at check of serviceability of functioning of a probe;
d) Quality of fuel: Serviceable functioning of a l-probe becomes possible only under condition of application for filling of the car of UNLEADED fuel!

In addition to the conditions listed in the previous paragraph at service of a l-probe it is necessary to observe some special precautionary measures:

a) The oxygen sensor is equipped tightly built in in it and the equipped contact tip with a piece of the electroconducting which attempts of a detachment can lead to an irreversible exit of the sensor out of operation;
b) Try not to allow hits in a jalousie of the sensor or its electric socket of dirt and greasing;
c) Do not use for cleaning of the oxygen sensor any solvents;
d) Address with a l-probe extremely carefully, do not drop it and try not to shake;
e) The silicone protective cover should put on on the sensor strictly definitely not to be melted and not to break serviceability of functioning of a probe.

CHECK

 PERFORMANCE ORDER

1. Find the electric socket of the sensor. From a reverse side of the socket enter the unbent writing paper clip into a nest of contact of an alarm wire (the plug No. 1 [+]), the second paper clip enter into a nest of the No. plug 2 (weight). Connect to the first paper clip positive щуп the voltmeter, negative connect to a paper clip entered into the grounding plug. Cock the parking brake, transfer the AT selector lever to the situation "R", on models from RKPP choose neutral transfer. To Poddomkratta a car front also establish it on props.

2. Start the engine and start to trace changes of alarm tension of the oxygen sensor.

try not to touch to warmed up with surfaces of system of production of the fulfilled gases.

Slower fluctuations of tension of a secondary l-probe are a consequence of operation of the catalytic converter as the connected atoms of oxygen in molecules of CO2 and H2O influence a sensitive element of a probe in much smaller degree, than atoms as a part of molecules WITH and NOH.

3. At the initial stage the cold sensor should develop a constant signal amplitude 0.1 ÷ 0.2 In (a mode of the opened contour). About two minutes later the engine will reach normal working temperature and the indication of the sensor will start to hesitate in limits from 0.1 to 0.9 In (a mode of the closed contour). If the system does not pass to a mode of the closed contour, or passes with is inadmissible a big delay (the lazy sensor), replace a l-probe.
4. Check also serviceability of functioning of a heater of the oxygen sensor. Disunite the socket of electroconducting of a probe and connect an ohmmeter between plugs of a heater (No. No. 3 and 4 plug). Nominal resistance makes 10 ÷ 40 Ohm.
5. Check serviceability of giving of a food on a heater. Disunite the electric socket and measure tension on it from a plait between the plug No. 4 and weight. At the included ignition (do not start the engine) the voltmeter should fix tension of the battery. If a food is absent, check an electroconducting condition on a chain site between the main relay, RSM and the oxygen sensor.
6. At negative results listed above checks, replace a faulty l-probe.

REPLACEMENT

 PERFORMANCE ORDER

The l-probe reversing on the cold engine can appear the extremely inconvenient in view of thermal compression of metal final collectors/pipes of system of release. In order to avoid risk of damage of components before starting removal of the sensor warm up the engine during few minutes - try not to burn about the warmed-up surfaces in the course of procedure performance.

1. Disconnect a negative wire from the battery.

If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that have the correct combination for audiosystem input in action!

2. To Poddomkratta the car also establish it on props.
3. Accurately disunite the socket of electroconducting of the oxygen sensor.

4. Accurately turn out a probe from a final collector (the primary sensor) or assemblies of the catalytic converter (the secondary sensor).

5. Before a sensor vvorachivaniye into place grease its carving part with anti-taking hermetic (new sensors are usually already covered with the relevant structure).
6. Screw the sensor on the regular place and strongly tighten it.
7. Connect electroconducting.
8. Lower the car on the earth and make its trial runs. Check memory of the module of management on existence of codes of malfunctions.