Toyota Corolla

1992-1998 of release

Repair and operation of the car


Toyota Corolla
+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engines
+ 4. Cooling systems, heating
+ 5. Fuel, exhaust systems
- 6. System of decrease in toxicity
   6.1. Specifications
   6.2. Electronic control system
   6.3. Electronic control unit
   - 6.4. System of onboard diagnostics
      6.4.1. Reading of diagnostic codes
   + 6.5. Sensors of system of automatic control of the engine
   6.6. System of catching of vapors of gasoline
   6.7. System of recirculation (EGR system)
   6.8. System of compulsory ventilation of a case (PCV system)
   6.9. Catalytic converter
+ 7. Transmissions
+ 8. Coupling and half shafts
+ 9. Brake system
+ 10. Suspension bracket and steering
+ 11. Body
+ 12. Electric equipment



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6.4.1. Reading of diagnostic codes
GENERAL INFORMATION

System of onboard diagnostics – diagnostic codes

Code
Name of a signal, chain or system Reason of record of a code Faulty object
1 There are no refusals If refusals are not revealed, then the control lamp periodically quickly flashes and dies away
12 Signal of speed of rotation of the engine There is no signal of turns of the engine on an electronic control unit in several seconds after start of the engine Distributor of ignition or chain, sensor of an angle of rotation of the crankshaft or chain, electronic control unit or chain
13 There is no signal of turns of the engine on an electronic control unit at a speed of rotation of 1500 rpm Distributor of ignition or chain, sensor of an angle of rotation of the crankshaft or chain, electronic control unit or chain
14 Ignition signal On an electronic control unit the ignition signal does not arrive Electronic block of ignition or chain, ignition coil, ignition key or chain, electronic control unit
16 Control signal of an electronic control unit (ECM) Malfunction in the control unit, signals to engine sensors are not transmitted Electronic control unit
21 Main sensor of oxygen The chain of the main sensor of oxygen is faulty Main sensor of concentration of oxygen or chain, electronic control unit
22 Temperature of cooling liquid Break or short circuit in a chain of the sensor of temperature of cooling liquid Sensor of temperature of cooling liquid or chain, electronic control unit
24 The air temperature sensor on the soaking-up collector Break or short circuit in an air temperature sensor chain on the soaking-up collector The air temperature sensor on the soaking-up collector or a chain, an electronic control unit
25 Sensor of concentration of oxygen or chain The chain of the sensor of oxygen indicates excessively grown poor gas mixture Nozzle or chain, the sensor of concentration of oxygen or chain, electronic control unit, the fuel pressure regulator, the sensor of temperature of cooling liquid or chain, the sensor of absolute pressure on the soaking-up collector or a chain, leak of vacuum or exhaust gases, fuel pollution, system of ignition
26 Sensor of concentration of oxygen or chain The chain of the sensor of oxygen indicates reenrichment of gas mixture Nozzle or chain, sensor of temperature of cooling liquid or chain
27 Auxiliary sensor of oxygen Break or short circuit in a chain of the auxiliary sensor of oxygen Sensor of concentration of oxygen or chain, sensor of temperature of okhlazhdpyushchy liquid or chain, fuel pressure regulator, system of catching of vapors of gasoline, system of recirculation, sensor of absolute pressure or chain, control unit, system of the air intake, electronic control unit
31 The sensor of absolute pressure on the soaking-up collector (MAR-the sensor) Break or short circuit in a chain of the sensor of absolute pressure on the soaking-up collector Auxiliary sensor of concentration of oxygen or chain, electronic control unit
41 Sensor of an angle of rotation of a butterfly valve Break or short circuit in a chain of the sensor of an angle of rotation of a butterfly valve The sensor of absolute pressure on the soaking-up collector or a chain, an electronic control unit
42 Car speed sensor There is no speed signal within 8 seconds by the included transfer and at a speed of rotation of the engine from 3000 to 5000 rpm Sensor of an angle of rotation of a butterfly valve or chain, electronic control unit, sensor of speed of the car or chain, electronic control unit, speedometer
43 Start signal The starter signal on an electronic control unit appears on the based car only at achievement of speed of rotation of the engine of 800 rpm Starter signal chain, ignition switch, electronic control unit
51 Signal of a condition of the switch On an electronic control unit signals of turn of a butterfly valve, from the selector of transfers or from the conditioner do not arrive Switch of air conditioning or chain, amplifier of air conditioning system, Neutral/Start switch, sensor of an angle of rotation of a butterfly valve, electronic control unit
52 Detonation sensor signal Break or short circuit in a detonation sensor chain Detonation sensor, electronic control unit
71 System of recirculation Too weak signal of temperature in system of recirculation System of recirculation of exhaust gases (hoses, valves etc.), temperature sensor or chain of the sensor, recirculation electropneumatic valve, electronic control unit

Reading

PERFORMANCE ORDER
1. For reading of diagnostic codes first of all be convinced that tension of the rechargeable battery is not lower than 11 V, the butterfly valve is completely closed, the control lever of the check point is established in neutral situation, switches on the dashboard are switched off and the engine is heated-up up to the normal temperature.
2. Turn the ignition key on in position of ON (the engine do not start).
3. Close накоротко contacts of TE1 and E1 of the diagnostic socket a crossing point.
Prevention

Connection to system of self-diagnostics is provided as with via the diagnostic N1 socket located in a motor compartment or via the diagnostic N2 socket mounted under the dashboard from the driver.

4. Consider a diagnostic code by the number of flashes of the control light index of CHECK-ENGINE on the dashboard. To the normal state of system at all cars there corresponds the N1 code. The N1 code is represented by a periodic blinking of the control light index with an interval of 0,25 seconds.
5. Number of a code is visualized and read out as follows. At first the first series of flashes which number corresponds to the first figure of number of a code follows, then the pause follows, then the second series of flashes, the quantity of blinkings in which corresponds to the second figure of number of a code, follows. For example, the code 24 (a code of the sensor of temperature of the sucked-in air) will be represented as follows: at first two flashes, follow then a pause and further 4 more flashes. Duration of flashes will be identical, however pause duration between figures of number of codes will differ. The exception makes only a code 1 (normal work) which will continue to flash without pauses.
6. If in system there are any failures then corresponding to them codes of violations remain in memory of the computer and the lamp will blink so many time how many it is necessary for definition of a code of refusal. If in memory there are more than one code of refusal, then these codes will be displayed in ascending order of number (from smaller to bigger), with a pause between them. After the light index displays a code with the greatest number of flashes, one more pause will follow, and all sequence of display of codes will repeat from the very beginning.
Prevention

At display of diagnostic codes of malfunction with numbers 25, 26, 27 and 71 use of special function of the self-diagnostics called "logic of double check" is provided. The essence consists that final record of refusal in memory happens on the basis of these two arrivals of the car. At first during a trip to memory the code with the specified number is temporarily brought. Then the engine should be stopped then to start again and to make the second trip. After the second trip the refusal is constantly stored in memory of an electronic control unit. Such order provides record of steady refusal and allows to exclude false record. In principle the system of self-diagnostics provides steady record of refusals with the specified codes, however in case the owner wants to recheck reliability of record of codes, it will be necessary to make two control arrivals and to be convinced of safety of these codes.

7. In order that it is correct to interpret codes on flashes of the control light index, you watch closely pauses between the termination of one code and the beginning of the following, otherwise incorrect definition of number of flashes and the wrong interpretation of display of a code are possible (duration of pauses depends on a year of release of model).

Cancellation

PERFORMANCE ORDER
1. After replacement or repair of the faulty unit, the refusal code which is written down in memory of the computer has to be cancelled. For this purpose, at the switched-off ignition get for the period of not less than 10 seconds a safety lock (1) of system of electronic injection of fuel with rated current 15 A.
2. The written-down code can be cancelled if the rechargeable battery to disconnect from weight, however at the same time also other useful information (installation of hours or setup of the receiver) is also destroyed.
3. If the diagnostic code is not cancelled, it will remain in memory of an electronic control unit and will appear with new codes in case of further detection of failures.
4. If it is necessary to perform any works on the engine what requires a detachment of the rechargeable battery from weight, then always previously check record of a diagnostic code.