Toyota Corolla

1992-1998 of release

Repair and car operation

The correct operation of the sensor depends on four conditions:

      – the electric: the low voltage generated by the sensor, very strongly conditions of connections with wires which always should be pure and strong and is checked first of all, both in case of signals of system of self-diagnostics, and at suspicion on malfunction of the sensor;
      – supply of external air: the sensor is arranged so that air circulates in its internal space. Every time at removal or installation be convinced of purity of air channels of the sensor;
      – working temperature: signals from the sensor do not arrive on the electronic control unit until the temperature of the sensor will not reach about 300 ° With (this factor should be considered at an assessment of serviceability of the sensor);
      – use of unleaded gasoline is an essential condition of the correct operation of the sensor.

Besides specified above conditions that at service of the sensor it is necessary to observe the following special rules:

      – the flexible conductor and the socket of the sensor of oxygen are not folding and from the sensor are not disconnected;
      – damage or a separation of the flexible conductor or the socket can adversely affect serviceability of the sensor;
      – it is not allowed hits of dirt, lubricants and other extraneous components on the socket or on a tower insulator of the sensor;
      – it is forbidden to wipe the sensor all types of cleaners;
      – it is forbidden to drop the sensor or carelessly to address with it;
      – watch correctness of installation of a silicone cover of the sensor to avoid cover melting because of which failure of the sensor is possible.

Check

PERFORMANCE ORDER

1. For check of the sensor connect the digital voltmeter and on the working engine track indications (the voltmeter should show tension at level in volt shares). For this purpose find the socket of the sensor of oxygen and enter щуп the voltmeter into contact to a wire of black color from a reverse side of the socket of the sensor. 2. Correctly to incorporate to a wire of the socket dress on a wire long a straight line shtyrevy a sampler and enter a sampler on a wire into the socket against the stop in metal contact of a wire. Connect positive щуп the voltmeter to a sampler, and negative щуп with weight. 3. Start the engine and throughout warming up watch tension from the main sensor of oxygen (tension should be up to standard of volt shares). The sensor of concentration of oxygen will constantly generate a signal of tension which on the cold engine (the opened cycle) makes 0,1–0,2 volts. About 2 minutes later the engine will get warm to working temperature and tension from the sensor of oxygen will fluctuate in limits from 0,1 to 0,9 volts (the closed cycle of engine management joins). If the signal from the sensor of oxygen differs from the specified values, the sensor is subject to replacement. 4. For access to the socket of the auxiliary sensor of oxygen it is necessary to remove a forward seat of the passenger. 5. For check of the auxiliary sensor of oxygen find the socket and execute the same checking procedures as with the main sensor of oxygen. 6. Check a heater of the auxiliary sensor of oxygen (if is available) as follows. Disconnect the socket of the sensor of oxygen and attach an ohmmeter between contacts +В and NT in the socket from the sensor. The indication of an ohmmeter should be within 11,0–17,0 Ohm. Prevention With the warmed-up sensor of concentration of oxygen are completed only a part of cars. The socket of the warmed-up sensor of oxygen has four contacts. 7. Check supply voltage of a heater of the sensor of oxygen. At the included ignition (the engine does not work) check tension existence from the battery between black-red (positive +) and black-blue (the negative–) wires in the socket from conducting. 8. On models of 1993-1994 the sensor of oxygen can be checked in a different way. On completely heated-up engine and at the connected sensor of oxygen connect positive щуп the voltmeter to a conclusion of VF1 of the diagnostic socket (it is specified by an arrow), and negative щуп – to conclusion Е1. Finish speeds of rotation of the engine to 2500 rpm, connect contacts THAT 1 and Е 1 diagnostic socket a wire or a writing paper clip. Prevention Measure tension by only the strelochny voltmeter as it is necessary to watch arrow fluctuations. 9. Sustain the engine at speed of rotation of 2500 rpm for about 2 minutes connect contacts THAT 1и Е1 the diagnostic socket. Check number of deviations of an arrow in 10 seconds. The quantity of deviations of an arrow should be not less than 8. If the quantity of deviations of an arrow is less, warm up the engine once again and repeat check. 10. If quantity of deviations of an arrow on former less than 8, remove a crossing point connecting conclusions THAT 1и Е1. Supporting speed of rotation of the engine of 2500 rpm, measure tension between conclusions of VF1 and Е1. If tension a more than 0 In, replace the sensor of concentration of oxygen. If tension is equal 0, consider self-diagnostics codes (see subsection 6.4.1) and establish a cause of failure. 11. If codes 21, 25 or 26 are received, disconnect a vacuum hose of system of compulsory ventilation of a case from a cover of a head of cylinders (see subsection 6.8) and measure tension between VF1 and Е1. If tension is equal 0, replace the sensor. If measured tension exceeds 0 In, the engine works with the reenriched mix and power supply system repair is required. 12. If other codes are received, repair the concrete sensor or a chain.

Replacement

When cooling the final collector or an exhaust pipe in which will screw the sensor, are compressed, therefore, on the cold engine to unscrew the sensor difficultly. Not to damage the sensor (it is supposed that you will use it further) start and warm up the engine within 1–2 minutes, stop the engine. Be careful not to get burns at performance described below actions.